Maximum Fertilizer Material to Apply with Seed
Select Crop Select Fertilizer Fertilizer Rate (F) This rate will have:
Corn Urea (46 - 0 - 0)
Soybean Urea NBPT *
Wheat-hard red spring 28-0-0 15.5 lbs/a with the seed 7.2 lbs/a of Nitrogen (N)
Wheat-durum Am.nitrate (34 - 0 - 0)
Alfalfa DAP (18 - 46 - 0)
Barley MAP (11 - 55 - 0) gal/acre lbs/a of Phosphorus (P2O5)
Canola TSP (0 - 46 - 0)
Cotton 10-34-0
Flax 7-21-7 lbs/a of Potassium (K2O)
Lentil 9-18-9
Mustard 3-18-18 Yellow Boxes are Calculated
Oats 4-10-10
Pea KCL (0 - 0 - 60)
lbs/a of Sulfur (S)
Safflower KSMg (0-0-22-22S-11Mg)
Sorghum K Sulfate (0-0-50-17S)
Sunflower ATS (12-0-0-26S)
Parameters lbs/a of (Mg)
1.0 Soil Moisture & Texture (MX)
* NBPT is a urease inhibitor
-0.97 Coefficient (C)
Enter Values in Boxes Select: Soil Texture Planting- Soil Moisture
Seed Furrow Opening Width (S) 1 inches Fine-Medium Moist
Coarse Borderline
Row Spacing (R) 30 inches Dry
Tolerated Stand Loss (T) 15 %
(due to fertilizer)
Equation: F = 30S(-T)/CRMX Values should match "Enter Values in Boxes" entries
Where: 1 30 15 Verify
with support from
F = fertilizer material in lb/a
S = seed furrow opening width in inches
T = is the tolerated stand loss, as a percent, due to fertilizer applied with the seed over typical stands - Press: Seed Furrow Width & Stand Definitions
where no fertilizer is applied.
C = negative regression coefficient for the selected crop x fertilizer: ( % / lb a -1 )
R = row spacing in inches Press: Fit Program to Screen
MX = planting soil moisture and soil texture coefficient.
;
Table 1. Slope Coefficients from laboratory crop emergence regressed on fertilizer rate
Fertilizers ---------------------------------------------------- all coefficients are negativ
Wheat-Hard Red Wheat-
Corn Soybean Spring Durum Alfalfa Barley Canola
Urea -0.965 -3.330 -1.436 -1.468 -6.373 -1.207 -4.457
Urea+NBPT1 -0.434 -3.403 -0.951 -0.900 -2.225 -0.772 -2.509
28-0-0 -0.236 -1.703 -0.258 -0.396 -2.821 -0.281 -1.873
Am.Nit -0.215 -2.378 -0.893 -1.107 -2.924 -0.432 -3.034
DAP -0.236 -1.080 -0.541 -0.617 -1.074 -0.477 -1.567
MAP -0.161 -1.097 -0.406 -0.700 -1.107 -0.302 -0.971
TSP -0.099 -0.592 -0.266 -0.328 -0.955 -0.179 -0.977
10-34-0 -0.037 -0.478 -0.105 -0.234 -0.650 -0.199 -0.685
7-21-7 -0.053 -0.597 -0.143 -0.153 -0.381 -0.058 -0.483
9-18-9 -0.154 -0.688 -0.140 -0.193 -1.157 -0.125 -0.673
3-18-18 -0.103 -0.521 -0.070 -0.165 -0.573 -0.098 -0.613
4-10-10 -0.045 -0.506 -0.050 -0.200 -0.303 -0.081 -0.269
KCL -0.473 -2.166 -0.891 -1.156 -1.505 -0.618 -1.479
KSMg -0.215 -0.822 -0.558 -0.578 -0.725 -0.364 -0.981
K Sulfate -0.095 -0.693 -0.474 -0.569 -0.970 -0.212 -1.177
ATS -0.300 -4.001 -1.169 -0.934 -4.418 -1.306 -2.920
1
NBPT is a urease inhibitor
Table 2. Fertilizer elemental analysis and liquid weights
N P K S Mg lb/gal
Urea(46-0-0) 0.46 0 0 0
Urea+NBPT 0.46 0 0 0
28-0-0 0.28 0 0 0 10.65
Am.Nit (34-0-0) 0.34 0 0 0
DAP (18-46-0) 0.18 0.46 0 0
MAP (11-55-0) 0.11 0.55 0 0
TSP (0-46-0) 0 0.46 0 0
10-34-0 0.1 0.34 0 0 11.6
7-21-7 0.07 0.21 0.07 0 10.7
9-18-9 0.09 0.18 0.09 0 11
3-18-18 0.03 0.18 0.18 0 11.7
4-10-10 0.04 0.1 0.1 0 10.7
KCL (0-0-60) 0 0 0.6 0
KSMg (0-0-22-22S-11Mg) 0 0 0.26 0.18 0.11
K Sulfate (0-0-50-17S) 0 0 0.51 0.19
ATS (12-0-0-26S) 0.12 0 0 0.26 11.1
- all coefficients are negative -------------------------------------------
Cotton Flax Lentil Mustard Oat Pea Safflower Sorghum
-3.201 -7.208 -2.706 -2.903 -1.634 -1.489 -3.175 -2.521
-2.291 -2.194 -1.504 -2.150 -0.978 -1.236 -2.186 -0.925
-0.640 -2.495 -1.290 -2.017 -0.551 -0.799 -1.539 -0.825
-0.621 -2.479 -1.825 -2.604 -0.807 -1.062 -2.271 -1.038
-0.645 -1.153 -1.141 -1.182 -0.545 -0.703 -1.082 -0.862
-0.607 -0.902 -1.115 -1.235 -0.578 -0.678 -0.777 -0.465
-0.207 -0.655 -0.587 -1.061 -0.210 -0.247 -0.610 -0.274
-0.455 -0.537 -0.582 -0.340 -0.213 -0.143 -0.583 -0.172
-0.255 -0.291 -0.474 -0.303 -0.193 -0.218 -0.387 -0.166
-0.468 -0.827 -0.502 -0.694 -0.378 -0.222 -0.557 -0.501
-0.313 -0.617 -0.424 -0.493 -0.099 -0.240 -0.452 -0.263
-0.123 -0.162 -0.314 -0.252 -0.121 -0.121 -0.286 -0.122
-0.982 -1.419 -1.632 -2.357 -1.067 -1.282 -1.426 -1.189
-0.623 -0.749 -0.799 -0.883 -0.782 -0.344 -0.663 -0.803
-0.564 -0.954 -0.824 -1.398 -0.507 -0.449 -0.693 -0.984
-2.090 -1.981 -2.856 -4.540 -1.889 -4.557 -2.976 -1.774
Table 3. Moisture by texture coefficients
Moisture Texture Coefficient
Moist fine/medium 1.0
Moist course 1.5
Borderline fine/medium 1.5
Borderline course 2.0
Dry fine/medium 2.0
Dry course 2.5
Sunflower
-2.258
-0.857
-0.556
-0.993
-0.306
-0.367
-0.335
-0.244
-0.163
-0.328
-0.155
-0.098
-0.764
-0.261
-0.337
-1.758
Definitions of Terms
Seed Furrow Opening is the planter seed-slot width. For most row crop planters, a value of 1 inch is generally assumed.
width should be given in the equipment manual or measured at the opener. It is assumed that fertilizer is spread within thi
well; therefore, the wider the value the less concentrated the fertilizer, and therefore less seed damage.
Tolerated Stand Loss (%) is the percent stand loss over typical stands when no fertilizer is applied with seed. For examp
tolerated stand loss is entered, this would indicate a producer's tolerance of 5% maximum reduction in plant stand due to s
fertilizer over the producer's typical stand without added fertilizer. If, for example, 30,000 seeds are planted and a typic
3%, we have 30,000 * 0.97 * 0.95 =27,645 : (27,645 plants / 30,000) = 92% or an 8% tolerated stand reduction.
The higher the value entered (in this case 5%), the more risk the producer is willing to take in stand reduction due to adde
fertilizer. Of course, corn is much more sensitive to stand reduction than soybean or small grain, which can partially comp
lower stands. Whereas stand reductions of greater than 5 to 10 % may cause yield reductions with corn, yield reductions
or small grain may not occur until stand reductions are greater than 20 to 50% of seeds planted.
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of 1 inch is generally assumed. For drills, the
that fertilizer is spread within this width as
eed damage.
is applied with seed. For example, if 5%
reduction in plant stand due to seed-placed
seeds are planted and a typical stand loss is
rated stand reduction.
e in stand reduction due to added seed-placed
l grain, which can partially compensate for
ions with corn, yield reductions with soybean
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