Sponsored by the Nebraska Corn Grower's Association and the

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Sponsored by the Nebraska Corn Grower's Association and the Powered By Docstoc
					      Welcome to the Nebraska On-Farm Research Network

  Sponsored by the Nebraska Corn Grower's Association and the Nebraska
    Corn Board in partnership with the University of Nebraska - Lincoln
                                Extension


 Any time you have questions regarding this project, contact day or night
Keith Glewen (402-450-1463 kglewen1@unl.edu ) or Gary Zoubek (402-326-
8185 gzoubek1@unl.edu )UNL Extension Educators. Additional information
       is also available at http://ardc.unl.edu/onfarmresearch.shtml



    Members of the Nebraska Corn Grower's Association and faculty at the University of Nebraska
  Institute of Agriculture and Natural Resources have identified (3) research topics important to the
                sustainability of corn production in Nebraska. Those three (3) topics are:

1. Identifying the Optimum Corn Plant Population in Dryland and Irrigated Corn Production
2. Nitrogen Management
3. Irrigation Management




On-Farm research provides you with the opportunity to evaluate or validate corn production practices on your
farm, in your fields, using your machinery. This research represents field size treatments. Not small plots!


You can learn more about each of the topics and what is required by clicking on the tabs located at the bottom
of this page.


On behalf of the Nebraska Corn Growers Association and the Nebraska Corn Board
thank you for expressing interest.
                                NEBRASKA ON-FARM RESEARCH NETWORK
                                  PROJECT EXPERIMENTAL PROTOCOL
                                             YEAR: 2012


(Please type below the title of the On-Farm Research study you have selected) Please share this form with Keith
Glewen at kglewen1@unl.edu or Gary Zoubek at gzoubek1@unl.edu                                     Study
Selected:_______________________________________________________________

                                                         Private Industry
   Producers Name:                                      Cooperator's Name:
        Address:                                             Address:
         Town:                                                Town:
         Phone:                                               Phone:
         Email:                                               Email:
Objective:
1. Legal Description:
       Location:
          Soils:
      Row Width:                                               Irrigation:
     Crop Rotation:
  2. Equipment size
 to be used on plot:
        Planter:                                           Row Cultivator:
       Combine:                                                   Disk:
        Sprayer:                                           Field Cultivator:
         Other:                                            Tillage Practice:
 3. The plot will be
      set up with:
The number of replications will be determined according to space limitations with a target of seven replications
(five minimum) for paired comparison and five replications (four minimum) for block designs. Each replication of
paired comparisons will be established according to the following directions.
Number of rows/feet (circle one) of each treatment:
Number of rows/feet (circle one) in the middle of each treatment to be
measured for treatment effects:

Remaining number of border row/feet (circle one) on each side of treatment:
4. Treatment: 1
Operations (equipment and materials):
a.
b.
c.
d.
e.
f.
g.
Treatment: 2
Operations (equipment and materials):
a.
b.
c.
d.
e.
f.
g.
Treatment: 3
Operations (equipment and materials):
a.
b.
c.
d.
e.
f.
g.
Treatment: 4
Operations (equipment and materials):
a.
b.
c.
d.
e.
f.
g.
5. Response variables to be measured may include: seedling population, harvest population, mature plant
height, mature pod height, percent weed control by species, disease and insect incidence, and other variables of
relevance.
6. Harvest will be accomplished using a combine and weigh wagon. Data will be converted to:
 % moisture basis. (Corn 15.5%, Grain Sorghum 14%, Soybeans 13%)
a. Conduct combine harvest by taking measurements on the middle:
*Rows/Feet (circle one) of each treatment, leaving:
*Border rows/feet (circle one) of the treatment on each side:
*Make sure the combine has been operated to eliminate loss of seed in the bin and augers of the combine. The
seed will be weighed in the weigh wagon [bagged sample(approximately the volume of a coffee mug) taken from
each load]
b. Determine and adjust for harvest loss.
7. Analyze the data collected at harvest with statistical methods consistent with the experimental design.
8. Making minor adjustments in experimental design for logistics of implementation, will conduct the experiment
for additional year(s):
9. Make data, analysis and interpretations available to the producer, project members, personnel and other
targeted audiences, as warranted.
10. Alternative weigh source(s):
 H NETWORK
ROTOCOL




e selected) Please share this form with Keith
u                               Study
_________________




mitations with a target of seven replications
 mum) for block designs. Each replication of
 ections.
ation, harvest population, mature plant
e and insect incidence, and other variables of

  Data will be converted to:
 %)
:



d in the bin and augers of the combine. The
ately the volume of a coffee mug) taken from



sistent with the experimental design.
mplementation, will conduct the experiment

 project members, personnel and other
                   ON-FARM CORN POPULATION RESEARCH PROTOCOLS

         Dr. Thomas Hoegemeyer, Professor of Practice, UNL Agronomy & Horticulture;
            Keith Glewen, Jennifer Rees and Gary Zoubek, UNL Extension Educators

                   A Research Protocol - (Note tabs located at bottom of the page )
Rationale:
 Identifying the optimum corn plant population

Producers continually question whether they should be increasing corn plant populations to optimize
yield and to maximize the efficiency of production inputs. In Nebraska, the environment for rainfed
production can vary greatly from East to West, and from year to year at each location. For irrigated
production this is also true, but producers are more interested in maximizing water productivity by
selecting optimum populations.

Optimum plant populations are a moving target. Improved genetics and production practices, coupled
with differences in growing conditions from year to year, make it difficult to pinpoint optimum corn
plant population. In addition, private and public research has shown corn hybrids respond differently to
the same population level under the same growing conditions. Evidence of environmental interactions
between hybrids and years is also well known.

Previous on-farm research conducted in Eastern Nebraska would suggest corn populations, especially for
rainfed conditions are too low. Experts in this field of study have also suggested that growing irrigated
corn utilizing high-yield production methods requires significantly higher corn population then are
currently the norm.

Objective: Identify the most profitable corn plant population for a specific management system.

Procedure:
To accurately determine the optimum planting rate four plant populations, replicated in a field and
evaluated over a course of multiple years is the ideal. Four replications would be the maximum required.
If this is too restrictive for the grower, three populations is better than the minimum of two.

Populations to evaluate must be considered based on rainfed/dryland or irrigated growing conditions.
The following corn plant populations are being suggested as a starting point. If these are not preferred or
acceptable, the participant may choose their own. However, it is strongly suggested the differences
between each population be 4K kernels. However, the highest treatment needs to be sufficient to “force”
a negative yield response, if we are to estimate optimum populations.

Rainfed/dryland West of Hwy 281: 20K-24K-28K-32K
Sandy sites or dryland West of Kearney: 18K-20K-24K-28K
Rainfed/dryland East of Hwy 281: 24K-28K-32K-36K
Irrigated (all Locations): 28K-32K-36K-40K or 30K-34K-38K-42K
 ( see four plant population tab located at the bottom of spread sheet )
Two Corn Plant Populations:


Evaluating two corn plant populations for many growers maybe more convenient, however it limits our
ability to conduct statistical analysis and identify the optimum planting rate for a given hybrid.
Nevertheless, if a grower chooses this method, results will still provide value to the participant. A
grower with a 16 row dual clutch planter system, will plant 8 rows of one population and the other 8
rows another population. After one round of planting we have 16 row blocks and can capture 8 row pairs
with an 8 row corn head. The same can be done with an 8 row planter or any other number of rows. It
may however take more of the operator’s time to obtain a block of rows needed for harvest purposes.
With only two plant populations, we need at harvest a minimum of 5 pairs for adequate replication.
More replications are desired. (see two population example at the bottom of spreadsheet page)

Cooperators will:
       Identify fields to be used for the research, including a map and GPS coordinates.
       Plant the same hybrid across each plant population treatment
       Provide all necessary fertilizer, seed, herbicide, and any other inputs necessary for normal
      crop production.
       Develop the trial plan with a UNL Extension representative.
       Plant experiments according to provided treatment arrangement and maintain field with
      adequate weed and other pest control as is necessary.
       Try to capture rainfall and irrigation amounts during the growing season at each site.
       Collect yield and final plant population data from each strip with assistance of UNL partners.
       Provide raw data to UNL

UNL will:
      Provide technical assistance in understanding replicated and randomized experimental
     design, its protocol and implementation.
      Provide technical assistance upon request and as available to assist with treatment
     implementation, document yield, final stand counts, and pinch stalk rot test.
      Provide technical assistance in capturing data at harvest
      Analyze raw data using statistical analysis
On-Farm Research Network Example                  Project Title: CORN POPULATION PROTOCOL
Year 2012
          24K
Treatment Name:
          28K
Treatment Name:
                                         Each treatment has 16 Rows
Border
24K
                         Plant 8 rows and record weight at harvest                          Pair 1
28K                      Plant 8 rows and record weight at harvest
                         Plant 8 rows and record weight at harvest                          Pair 2
24K                      Plant 8 rows and record weight at harvest
                         Plant 8 rows and record weight at harvest                          Pair 3
28K                      Plant 8 rows and record weight at harvest
                         Plant 8 rows and record weight at harvest                          Pair 4
24K                      Plant 8 rows and record weight at harvest
                         Plant 8 rows and record weight at harvest                          Pair 5
28K                      Plant 8 rows and record weight at harvest
                         Plant 8 rows and record weight at harvest                          Pair 6
24K                      Plant 8 rows and record weight at harvest
                         Plant 8 rows and record weight at harvest                          Pair 7
28K                      Plant 8 rows and record weight at harvest
                         Plant 8 rows and record weight at harvest                          Pair 8
24K                      Plant 8 rows and record weight at harvest




Border
On-Farm Research Network Example            Project Title: CORN POPULATION PROTOCOL
Treatment      24K
Treatment      28K
Treatment      32K
Treatment      36K

Year: 2012

Block 1

Treatment     24K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     28K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     32K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     36K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Block 2


Treatment     28K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     36K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     32K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     24K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Block 3


Treatment     28K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     24K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     36K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     32K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Block 4


Treatment     32K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     24K       Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment     28K       Rows planted in each treatment, need to be equal to or greater than corn head width.*
Treatment   36K       Rows planted in each treatment, need to be equal to or greater than corn head width.*


            * Contact Keith Glewen, UNL Extension Educator @ 402-450-1463 or Gary Zoubek 402-326-8185 for specific
r than corn head width.*

r than corn head width.*

r than corn head width.*

r than corn head width.*




r than corn head width.*

r than corn head width.*

r than corn head width.*

r than corn head width.*




r than corn head width.*

r than corn head width.*

r than corn head width.*

r than corn head width.*




r than corn head width.*

r than corn head width.*

r than corn head width.*
r than corn head width.*


ek 402-326-8185 for specific harvest instructions
                               ON-FARM RESEARCH NETWORK
                           NITROGEN RESEARCH TOPIC PROTOCOLS

              Dr. Charles Wortmann, UNL Extension Nutrient Management Specialist
                     Gary Zoubek & Keith Glewen, UNL Extension Educators

                 -A Research Protocol - (note tabs located at the bottom of the page)

Rationale:
 UNL recommended N rate versus a higher and lower rate for corn production

UNL research consistently confirms that N applied per unit of production (lb/bu) does not increase with
yield but generally decreases. This is attributed, at least partly, to the high N use efficiency possible with
crops that have healthy and well-developed root systems efficient in nutrient recovery and have plants
that are efficient in converting nutrients and carbohydrates to yield (e.g. internal or physiological
efficiency). The UNL N recommendation has been well validated for maximizing profitability at high
(e.g. >240 bu/ac) as well as lower yield production over diverse production situations. However, many
producers feel that N in excess of the recommendations is needed; this results in reduced profitability
and more N loss to the environment.

Objective: Verify the UNL N recommendation by comparing it to the UNL± 30 lb N rate.

Procedure:
Pre-Plant Nitrogen Application: - Conduct trials with 3 treatments: UNL, UNL-30; UNL+30 with 5
replications per farm. Trials can be in long strips across the field or, if using variable rate technology,
strips can be segmented to have 2 plots per strip, but minimum length should be 900 ft. This trial does
not require a guidance system or yield mapping but these are preferred. Residual nitrate-nitrogen sample
is required for test area.


Side-Dress - Corn growers may also apply the above amounts as side-dress either with a soil applied
ground rig or with a center pivot. With center pivot, corn growers can measure the response if they have
the capability of applying water and thus fertilizer in wedge/pie shapes and have precision ag. technology
in their combine. i.e. GPS and yield monitor to capture yield. Rates can be determined by use of the
following methods – 1. Presidedress-nitrate test. 2. The UNL recommendation.

Option 1. Assumes no substantial/unusual loss of N and that already-applied N is less than UNL
recommendation. Sidedress or fertigation application of N at V8 or later to make up the difference
(UNLd). This can have 2 or 3 treatments: UNLd, UNLd+30; or UNLd, UNLd+30, UNLd-30. We
suggest doing the pre-sidedress nitrate test by determining nitrate-N in surface 12” when corn is 12” tall.
http://cropsoil.psu.edu/extension/facts/agfact17.pdf.
Option 2. Apply according to the pre-sidedress nitrate test. Do pre-sidedress nitrate test by
determining nitrate-N in surface 12” when corn is 12” tall. The PSNT-N rate is = (25 ppm – measured) *
8. Therefore of the PSNT-N is 15, the rate = (25-15)*8= 80. It is suggested treatments be: PSNT-N,
PSNT-N+30; or PSNT-N, PSNT-N+30, PSNT-30.

● Varying N rate according to variation in past yield

The most profitable N rate is generally related to yield and less N is removed with lower yield crops with
increased risk of N loss to water bodies and the air. Increasing N rate according to corn productivity of
the field may also add to profitability as well as yield. Therefore, varying N rate according to expected
corn yields is potentially profitable while reducing risk of N loss to the environment.

Objective: Verify that the N rate can be profitably varied according to recent yield history of the field.

Procedure: Conduct trials with 2 treatments: UNL rate according to field average and the UNL rate
varied according to expected yield differences indicated by at least two years of corn yield maps. 7
replications per farm in pairs of long strips across the field with N rate varied according to yield level.
This trial requires variable rate N application and yield mapping.

Cooperators will:
       Identify fields to be used for the research.
       Responsible for costs associated with soil and tissue sampling and analysis.
       Provide all necessary fertilizer, seed, herbicide, and any other inputs necessary for normal
      crop production.
       Develop the trial plan with a UNL Extension representative.
       Plant experiments according to provided treatment arrangement and maintain field with
      adequate weed and other pest control as is necessary.
       Collect yield and final plant population data from each strip with assistance of UNL partners.
       Provide raw data to UNL.

UNL will:
      Provide technical assistance in understanding replicated and randomized experimental
     design, its protocol and implementation.
      Provide technical assistance upon request and as available to collect soil and tissue samples,
     assist with treatment implementation, document yield and determine final stand counts.
      Provide technical assistance in verifying treatments to be applied.
      Provide technical assistance in capturing data at harvest.
      Analyze raw data using statistical analysis.
On-Farm Research Network Example               Project Title: Nitrogen Research Protocol
Treatment      UNL - 30#
Treatment      UNL #
Treatment      UNL+30


Year: 2012

Block 1

Treatment      UNL - 30# Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL #       Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL+30      Rows treated with nitrogen need to be equal to or greater than corn head width.*



Block 2


Treatment      UNL #       Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL - 30#   Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL+30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*



Block 3


Treatment      UNL+30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL-30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL#        Rows treated with nitrogen need to be equal to or greater than corn head width.*



Block 4


Treatment      UNL-30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL+30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL         Rows treated with nitrogen need to be equal to or greater than corn head width.*
Block 5


Treatment   UNL-30#   Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment   UNL+30#   Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment   UNL #     Rows treated with nitrogen need to be equal to or greater than corn head width.*
n corn head width.*

n corn head width.*

n corn head width.*




n corn head width.*

n corn head width.*

n corn head width.*




n corn head width.*

n corn head width.*

n corn head width.*




n corn head width.*

n corn head width.*

n corn head width.*
n corn head width.*

n corn head width.*

n corn head width.*
On-Farm Research Network Example               Project Title: Nitrogen Research Protocol
Treatment      UNL - 30#
Treatment      UNL #
Treatment      UNL+30


Year: 2012

Block 1

Treatment      UNL - 30# Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL #       Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL+30      Rows treated with nitrogen need to be equal to or greater than corn head width.*



Block 2


Treatment      UNL #       Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL - 30#   Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL+30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*



Block 3


Treatment      UNL+30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL-30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL#        Rows treated with nitrogen need to be equal to or greater than corn head width.*



Block 4


Treatment      UNL-30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL+30#     Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment      UNL         Rows treated with nitrogen need to be equal to or greater than corn head width.*
Block 5


Treatment   UNL-30#   Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment   UNL+30#   Rows treated with nitrogen need to be equal to or greater than corn head width.*

Treatment   UNL #     Rows treated with nitrogen need to be equal to or greater than corn head width.*
n corn head width.*

n corn head width.*

n corn head width.*




n corn head width.*

n corn head width.*

n corn head width.*




n corn head width.*

n corn head width.*

n corn head width.*




n corn head width.*

n corn head width.*

n corn head width.*
n corn head width.*

n corn head width.*

n corn head width.*
                                                                              Project Title: Vary Nitrogen Rate According To V
                    On-Farm Research Network Example                          in Past Yield
Year 2012
Treatment:    UNL Rate According to Field Ave.
Treatment:    UNL rate, yield differences, 2 yrs. Corn yield maps
                                                             Each treatment has (see footnote)number of rows
Border
UNL Rate According to Field Ave.                                   Harvest   * rows and record weight
                                                         Discard   Rows
                                                         Discard   Rows
UNL rate, yield differences, 2 yrs. Corn yield maps                Harvest   * rows and record weight
                                                                   Harvest   * rows and record weight
                                                         Discard   Rows
UNL Rate According to Field Ave.                         Discard   Rows
                                                                   Harvest   * rows and record weight
                                                                   Harvest   * rows and record weight
                                                         Discard   Rows
                                                         Discard   Rows
UNL rate, yield differences, 2 yrs. Corn yield maps                Harvest   * rows and record weight
                                                                   Harvest   * rows and record weight
                                                         Discard   Rows
                                                         Discard   Rows
UNL Rate According to Field Ave.                                   Harvest   * rows and record weight
                                                                   Harvest   * rows and record weight
                                                         Discard   Rows
                                                         Discard   Rows
UNL rate, yield differences, 2 yrs. Corn yield maps                Harvest   * rows and record weight
                                                                   Harvest   * rows and record weight
                                                         Discard   Rows
                                                         Discard   Rows
UNL Rate According to Field Ave.                                   Harvest   * rows and record weight
                                                                   Harvest   * rows and record weight
                                                         Discard   Rows
                                                         Discard   Rows
UNL rate, yield differences, 2 yrs. Corn yield maps                Harvest   * rows and record weight
                                                                   Harvest   * rows and record weight
                                                         Discard   Rows

*The number of rows of each treatment will depend on width of the nitrogen application equipment and corn
 combine head width. ** For each treatment pair noted in the above example, two harvest weights must be
                                                recorded.
ogen Rate According To Variation




                                   Pair 1 **




                                   Pair 2**




                                   Pair 3**




                                   Pair 4**




                                   Pair 5**




                                   Pair 6**




                                   Pair 7**
            Arc length
                2640                                            1320
              8292.24             12      691.02              4146.12   12    345.51
              8292.24             15     552.816              4146.12   15   276.408




Three N treatments, five replications
Col         Trt                        Color
                                                                               Outside arc: 552'
      101            2   UNL-30        red         6.666667                    Inside arc: 276'
      102            3   UNL+30        blue        6.666667
      103            1   UNL           green       6.666667
      201            2   UNL-30        red         6.666667
      202            1   UNL                       6.666667
      203            3   UNL+30        blue        6.666667
      301            1   UNL                       6.666667
      302            3   UNL+30        blue        6.666667
      303            2   UNL-30        red         6.666667
      401            1   UNL                       6.666667
      402            3   UNL+30        blue        6.666667
      403            2   UNL-30        red         6.666667
      501            2   UNL-30        red         6.666667
      502            1   UNL                       6.666667
      503            3   UNL+30        blue        6.666667




2 fertigation N rates and 6 pairs of comparison
Col         Trt          Color
      101   UNL+30       red                             1
      102   UNL          cream                           1
      201   UNL          cream                           1
      202   UNL+30       red                             1
      301   UNL+30       red                             1
302   UNL      cream   1
401   UNL      cream   1
402   UNL+30   red     1
501   UNL+30   red     1
502   UNL      cream   1
                           Start
601   UNL      cream   1
602   UNL+30   red     1
               Three treatment protocol




de arc: 552'



                                          101

                                                  102
                                                         103




                         Two Treatment Protocol




                              602         101
                                                   102
                         102
       601


 502                            201


501
                               202



       402               301

             401   302
Two Treatment Protocol
ON-FARM RESEARCH NETWORK                                                                   IRRIGATION
                     RESEARCH TOPIC PROTOCLS

               Dr. Suat Irmak, UNL Soil & Water Resources and Irrigation Specialist
                     Gary Zoubek & Keith Glewen, UNL Extension Educators

Rationale:
 Traditional irrigation practices versus 75% and rainfed for corn production

UNL research at the South Central Agricultural Laboratory (SCAL) has confirmed that irrigating at
100% of ET results in optimum yield and that irrigating at 125% ET results in more yield loss and costs
than irrigating at 75% of fully-irrigated corn.

Over-irrigation can result in, deep percolation of water and nitrogen leaching, and runoff. Research has
shown that excess water can increase weed pressure and create an environment favorable to diseases.
Crop growth and yield can also be impeded with over-irrigation:

disturbs the oxygen balance of the root zone, drowns roots, reduces plant water uptake, and thus
stresses plants.
reduces the exchange of air (oxygen) between the soil and atmosphere, and causes reductions in root
growth (especially in the upper soil layers) and less transport of water and nutrients through the roots to
the upper parts of the plant.
increases microbial growth which can cause the formation of sulfides and butyric acid that are toxic to
plants.
increases the potential for root diseases.
causes a decrease in soil temperature, thus reducing root growth, which creates a shallow root
structure.
 leaches nutrients and pesticides from the root zone to groundwater.
negatively impacts yield.
wastes water and energy resources.

However, some producers feel that irrigation in excess of the recommendations is needed; this results in
increased energy costs, increased potential for N loss and reduced profitability.

Objective: Demonstrate UNL irrigation recommendations by comparing traditional practices to 75%
and rainfed and utilizing tools like ETgages, soil water sensors and drought resistant hybrids.

Procedure:
Irrigation Management: - Conduct on-farm trials with 3 treatments: Traditional; 75%; and rainfed
with 2 or 3 wedge/pie shapes at 75% (each pie should be at least 30% for a total of 90% if 3 wedges) and
the remaining area at the traditional rate on pivots that can accurately vary the speed at a given location.
If possible we would also like one or two rainfed corners. Yield data will be gathered using precision ag.
technology in their combine. i.e. GPS and yield monitor.

An alternative treatment would be to re-nozzle one of the inner pivot spans to 75%.
Additionally, if interested, producers could plant a replicated plot that includes a drought tolerant hybrid
versus a traditional hybrid or a population study that can be field length strips. Contact UNL Educator
for help in designing a planting plan.

Cooperators will:
       Identify fields to be used for the research.
       Provide all necessary fertilizer, seed, herbicide, and any other inputs necessary for normal
      crop production.
       Develop the trial plan with a UNL Extension person.
       Provide legal description to the field, fuel type, pumping lift, planting dates, irrigation
      dates/amounts.
       Collect rainfall information, weekly ETgage data and crop stage of growth information.
       Plant experiments according to provided treatment arrangement and maintain field with
      adequate weed and other pest control as needed.

           Collect yield and final plant population data from each strip with assistance of UNL partners.
           Provide raw data to UNL

UNL will:
      Provide technical assistance in understanding replicated and randomized experimental
     design, its protocol and implementation.
      Provide technical assistance upon request and as available to collect soil water, ETgage data
     and crop stage of growth and assist with treatment implementation, document yields.
      Provide technical assistance in verifying treatments to be applied.
      Provide technical assistance in capturing data at harvest
      Analyze raw data using statistical analysis
      Share research findings and information to farmer cooperators.
Option #1

            Rainfed
  Rainfed




            Rainfed




Option #2
On-Farm Research Network Example                            Project Title: CORN POPULATION PROTOCOL
Year 2012
Treatment Name:        24K
Treatment Name:        28K
                                                  Each treatment has 16 Rows
Border
24K
                                       Plant 8 rows and record weight at harvest
28K                                    Plant 8 rows and record weight at harvest
                                       Plant 8 rows and record weight at harvest
24K                                    Plant 8 rows and record weight at harvest
                                       Plant 8 rows and record weight at harvest
28K                                    Plant 8 rows and record weight at harvest
                                       Plant 8 rows and record weight at harvest
24K                                    Plant 8 rows and record weight at harvest
                                       Plant 8 rows and record weight at harvest
28K                                    Plant 8 rows and record weight at harvest
                                       Plant 8 rows and record weight at harvest
24K                                    Plant 8 rows and record weight at harvest
                                       Plant 8 rows and record weight at harvest
28K                                    Plant 8 rows and record weight at harvest
                                       Plant 8 rows and record weight at harvest
24K                                    Plant 8 rows and record weight at harvest




Border
These plots would be planted so that they cross the traditionally irrigated, 75% and rainfed areas!
PROTOCOL




           Pair 1

           Pair 2

           Pair 3

           Pair 4

           Pair 5

           Pair 6

           Pair 7

           Pair 8
On-Farm Research Network Example         Project Title: CORN POPULATION PROTOCOL
Treatment 24K
Treatment 28K
Treatment 32K
Treatment 36K

Year: 2012

Block 1


Treatment 24K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 28K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 32K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 36K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Block 2


Treatment 28K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 36K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 32K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 24K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Block 3


Treatment 28K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 24K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 36K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 32K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Block 4


Treatment 32K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 24K    Rows planted in each treatment, need to be equal to or greater than corn head width.*

Treatment 28K    Rows planted in each treatment, need to be equal to or greater than corn head width.*
Treatment 36K Rows planted in each treatment, need to be equal to or greater than corn head width.*
These plots should be planted so that they cross the traditionally irrigated, 75% and rainfed areas!
             * Contact Keith Glewen, UNL Extension Educator @ 402-450-1463 or Gary Zoubek 402-326-8184 for
             specific harvest instructions.

				
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