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Russet Potato Variety Development Oregon State University

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Russet Potato Variety Development Oregon State University Powered By Docstoc
					                    Research in the Klamath Basin
                         20 07 Annual Report

Russet Potato Variety Development, 2007
Brian A. Charlton and Darrin A. Culp1

Introduction
         Since its inception in 1985, the Tri-State variety development program has
primarily focused on the development of processing and dual-purpose (processing and
fresh market) russets. During the past decade, Oregon has been the lead state in the
release of nine varieties and is in the process of releasing two additional russets in 2008.
In total, more than 25 new varieties have been released by the Tri-State variety
development program since 1985. Although the development of russet varieties remain
the primary focus, recent efforts have included red-skinned and specialty-type selections.
Many of these selections offer unique skin and/or flesh color combinations along with
enhanced nutritional qualities including elevated antioxidant and Vitamin C content.
         Breeding efforts have focused more on improving genetic resistance to various
pests and diseases as a means of lowering production costs. For example, screening for
resistance to foliar and tuber late blight occurs in Corvallis, Oregon as environmental
conditions are conducive to disease development. High insect and disease pressure
occurs in the long growing-season of the Columbia Basin which makes the Hermiston
Agricultural Research & Extension Center (HAREC) an ideal screening location for
potato virus Y (PVY), potato leaf roll virus (PLRV) and associated problems of net
necrosis, early die syndrome, and more recently potato tuber moth (Phthorimaea
operculella (Zeller)). Screening for resistance to various species of nematodes and
related diseases is being accomplished at several locations. The Klamath Basin Research
and Extension Center (KBREC) routinely screen selections for resistance to root-knot
nematode (Meloidogyne chitwoodi and Meloidogyne hapla) and corky ringspot disease
resulting from infection of Tobacco rattle virus which is vectored by stubby-root
(Paratrichodorus spp.) nematodes. Other cooperating sites within the Tri-State area also
work on resistant screening and other production limitations most suited to their
respective location. The overall objective is that future releases will offer genetic
resistance to many economically important pests and diseases which will help reduce
production inputs as these continue to rise in cost.
         KBREC participation in the Tri-State evaluation of new russet lines includes the
following: Preliminary Yield Trial 2 (PYT-2), Statewide Russet Trial, and the late-season
Western Regional Russet Trial. In general, selections currently in the PYT-2 trial were
selected two to three years earlier from single-hill selections. Clones advancing from the
PYT-2 trial enter the Statewide Russet trial the following year and may advance after two

1
 Assistant Professor and Faculty Research Assistant, respectively, Klamath Basin Research and Extension
Center, Klamath Falls, OR.

Acknowledgements: Partial financial support for this program from the Oregon Potato Commission; the
Cooperative State Research, Extension, and Education Service (CSREES); and the USDA Agricultural
Research Service (ARS) is gratefully recognized.

Reference to a product or company is for specific information only and does not endorse or recommend
that product or company to the exclusion of others that may be suitable.
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                               Klamath Basin Research and Extension Center
                              Russet Potato Variety Development, 2007 Page 1
                  Research in the Klamath Basin
                       20 07 Annual Report
years of testing to the Tri-State trial. Clones graduating from the Tri-State trial advance
to the Western Regional Russet Trial which also includes material from breeding
programs in Colorado and Texas. Oregon selections remain in the Oregon Statewide
Trial until they complete regional evaluation or are discarded. In most circumstances, a
period of 12 to 15 years is required to release a variety following the actual breeding
cross.

Procedures
         Trials were conducted on a Poe fine sandy loam soil at KBREC. The soil has a
pH of 6.8 and an organic matter content of 1.02 percent in the plow layer. The location
was cropped to teff grass hay the previous year, which was treated with roundup during
the fall of 2006 to aid in breakdown of material through the winter. Gypsum was applied
at a rate of 2000 lbs/acre on April 11. Field preparation included discing twice, roto-
tilling once, and moldboard plowing once to break up sod in mid-April 2007. Fumigation
treatments included TeloneTM II (dichloropropene, Dow AgroSciences) at 15 gal/acre
(gpa) and Vapam (sodium methyldithiocarbamate, AMVAC) at 25 gpa on April 26,
2007, followed by several harrowing passes on May 7. Dry pre-plant fertilizer was
broadcasted on May 9 followed by liquid fertilizer applied at bed formation on May 10.
Total pre-plant fertilizer included 165 lb Nitrogen (N), 80 lb Phosphate (P2O5), 100 lb
Potash (K20) and 140 lb Sulfur (S).
         Seed for all trials was hand cut to approximately 1.5-2.0 oz/seed piece on May 9,
10 and 11, treated with Tops MZ (thiophamate-methyl, mancozeb, Bayer CropScience),
and suberized for 2 weeks at 550F and approximately 95 percent relative humidity. All
trials (Preliminary (PYT-2) Russet, Statewide Russet, and Regional Russet) were planted
at 9-inch spacing in 36-inch rows with an assisted-feed, 2-row planter on May 23. The
insecticide Admire Pro (imidacloprid, Bayer CropScience) at 5-6 fl. oz. / acre and the
fungicide Quadris (azoxystrobin, Syngenta) at 6-8 fluid oz. / acre were applied in-furrow
over the seed piece.
         Planted rows were bedded up and leveled off with a rolling cultivator and drag bar
followed by a pre-emergence application of Dual II Magnum (s-metalachlor, Syngenta) at
1.3 pt./ acre and Prowl H2O (pendimethalin, BASF) at 1.5 pt./ acre on June 12 for
broadleaf and grass weed control. Immediately following application, 0.43 inches of
irrigation was supplied to incorporate the herbicides. Matrix (rimsulfuron, Dupont) was
applied post-emergence at 1 oz. / acre on July 5 and incorporated with 0.25 inches of
irrigation. A total of 19.7 inches of water (irrigation plus rainfall) was applied during the
growing season with sprinklers arranged in a 40- by 48-ft. pattern.
         All trials were arranged in a randomized complete block design. The PYT-2
Russet Trial included 2 replications of 20-hill plots. Entries for the PYT-2 Russet Trial
included standard varieties Russet Burbank, Ranger Russet, Shepody, and Russet
Norkotah, and 66 numbered selections. The Statewide Russet Trial had 4 replications of
30-hill plots and included 15 numbered selections in addition to the same standard
varieties as those in the PYT-2 trial. The Western Regional Russet Trial had 4
replications of 30-hill plots. Ranger Russet, Russet Burbank, and Russet Norkotah were
the standard varieties along with 16 numbered selections.

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                          Russet Potato Variety Development, 2007 Page 2
                 Research in the Klamath Basin
                      20 07 Annual Report
        Plant stands were monitored on June13 and 27. Vine vigor was noted on July 25.
On July 26 the fungicide Ridomil Gold Bravo (mefenoxam/chlorothalinil, Syngenta) and
the insecticide Leverage (imidacloprid, cyfluthrin, Bayer CropScience) was applied
aerially. Another application of Ridomil Gold was applied on August 10 at labeled rates.
Plant maturity assessments were done September 6 followed by vine rolling and Reglone
(diquat dibromide, Syngenta) application at 1.5 pt. /acre with a ground sprayer on
September 10.
        Tubers were harvested using a one-row digger-bagger on October 5 (Regional
Russet), October 8 (PYT-2 Russet), and October 9 (Statewide Russet). All tubers from
each plot were stored at 550F until grading in early to mid November. Using USDA
potato grade standards, each plot was graded into U.S. No. 1s, No. 2s, B’s (under 4 oz.)
and culls. U.S. No. 1s were separated by weight to 4- to 8-oz, 8- to 12-oz, and over 12-oz
groupings. Sub-samples of approximately 10 lbs from the 8- to 12 oz. fraction were used
to determine specific gravity by the weight-in-air, weight-in-water method. Ten tubers
from the over 12-oz were selected at random and cut lengthwise to determine internal
defects.
        External characteristics were noted for each replication. Potatoes were
downgraded to No. 2s or culls if growth cracks, knobs, or misshapen tubers were severe
enough according to USDA grade standards. Yields for U.S. No. 1s were not adjusted to
account for external blemishes such as Rhizoctonia or silver scurf or internal defects such
as hollow heart, brown center, and others.
        With exception of the PYT-2 Russet Trial, data collected was analyzed using SAS
for Linear Models 9.1 (SAS Institute Inc.) software. Least significant differences (LSDs)
were calculated based on the student’s t test at the 5 percent probability level. Only a
portion of the data obtained is reported here. Data from all trial locations were
summarized and reports were reviewed by all cooperators on January 3 and 4, 2008 as the
basis for decisions on disposition of trial entries.

Results and Discussion
Preliminary Yield Trial
        A partial summary of yield characteristics of the clones selected for further
evaluation based on performance at KBREC is presented in Table 1. Eleven numbered
selections out of 66 were retained for further evaluation. Ideally, clones retained must
perform well at all locations; however, vast differences in climate, insect and disease
pressures, and other production scenarios among the testing locations prevent such
performance uniformity. Therefore, several selections are retained because of superior
performance at one location. In general, total yield of retained selections were slightly
lower than those of the standard varieties; however, yields of U.S. No. 1’s were generally
higher. Specific gravities were exceptionally high in 2007 compared to previous years
with several selections exceeding the 1.088 cap at which processing contracts begin to
assess penalties. In general, the ‘OR’ clones and POR05V016-2 were retained for
genetic resistances to various pests and diseases. These selections had poorer tuber
appearance than the standard entries and would likely find difficulty in meeting fresh
market appearance standards with the exception of POR05V016-2 which possessed very

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                  Research in the Klamath Basin
                       20 07 Annual Report
uniform tuber appearance. AO01114-4, AO02060-3, and AO03003-3 performed
exceptionally well at KBREC and had excellent tuber appearance.

Statewide Yield Trial
        All entries in this trial achieved excellent stands (Table 2) Most of the numbered
selections were similar in maturity to Russet Burbank and Ranger Russet with all
selections being later in maturity compared to Russet Norkotah. Hollow heart was not a
problem in 2007 compared to previous years; however, Russet Norkotah and AO96141-3
exhibited 15 and 13 percent, respectively. Although, excessive tuber size in these entries
undoubtedly skewed these values to some degree. Corky ringspot was problematic in
Ranger Russet, AO96164-1, AO96305-3, and AO98286-4. Three of the top yielding
selections (AO96365-2, AO98282-5, and AO01057-5) at KBREC were retained for
further evaluation (Table 3). Of these, AO98282-5 had the most attractive tuber
appearance for fresh market. AO96365-2 tended to be quite round and most suitable for
processing into chips. AO96164-1 and AO96141-3 have both performed exceptionally
well in the Western Regional trial. Both have produced very consistent processing
quality across all Tri-state (Oregon, Washington, and Idaho) locations. Oregon plans to
lead the release of AO96164-1 in 2008. As seen in the Preliminary Yield trial, specific
gravities were generally very high with the majority of entries exceeding the 1.088
threshold at which processing contracts begin to assess penalties. Total yields of retained
selections were generally comparable to the four standard entries. U.S. No. 1 yields were
generally higher than those of Russet Burbank and lower than Russet Norkotah with the
exception of AO96365-2 and AO01057-5 (Table 3).

Western Regional Trial
        Excellent stands were achieved by all entries in the trial. All entries were later in
maturity than Russet Norkotah (Table 4). A relatively high incidence of hollow heart
was observed for A96104-2, AOTX95265-2ARu and TXA549-1Ru. Vascular
discoloration was problematic for A97287-6 and corky ringspot was observed in varying
degrees in nearly every entry. Russet Norkotah has rarely exhibited corky ringspot
(CRS) symptoms in the Klamath Basin which suggests a possible difference in virus
strains compared to the Columbia Basin where Russet Norkotah routinely shows CRS
symptoms. Other entries exhibiting zero or low CRS symptoms were AO96164-1,
AOTX95265-3Ru, CO97087-2Ru, and CO97138-7Ru. Standard varieties produced total
yields similar to those observed in the Statewide Trial (Table 5). Seven selections have
been included in the trial for 3 years and have graduated. The disposition of these
selections will be determined by the sponsoring states. A95409-1, A96104-2,
AOA95154-1, and AOA95155-7 are Idaho selections, AO96164-1 is an Oregon
selection, CO95172-3Ru is from Colorado, and TXA549-1Ru is a Texas selection.
Release decisions have not been made for any of these selections with the exception of
AO96164-1 which is planned for release in 2008. Three selections dropped for various
reasons included A97287-6, CO97138-3Ru, and CO97138-7Ru. Selections producing
acceptable yields and attractive tuber appearance comparable to Russet Norkotah at
KBREC include A96104-2 and AOTX95265-4Ru. Both of these selections will be
evaluated in cultural management trials at KBREC in 2008.
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                            Klamath Basin Research and Extension Center
                           Russet Potato Variety Development, 2007 Page 4
                       Research in the Klamath Basin
                            20 07 Annual Report
Table 1. Tuber yield and specific gravity of potato entries selected from the Preliminary Yield Trial grown
at the Klamath Basin Research and Extension Center, Klamath Falls, OR, 2007.
Variety or             Yield U.S. No. 1s                          Yield                             Specific
selection              4-8 oz 8-12 oz >12 oz       total           <4 oz   No. 2s   culls   total   gravity
                       cwt/acre

Russet Burbank           120      116      75      311              52      162     136     661      1.093
Ranger Russet             90      177      133     399              64       90      35     588      1.099
Shepody                   59      108      158     325              25      185     123     658      1.077
Russet Norkotah          122      156      130     409              48       64      49     570      1.082


AO01114-4                 53      124      238     416              26       38      27     507      1.099
AO02060-3                 45      167      283     495              28       73      33     628      1.097
AO02118-2                 81      120      225     426              28       64      20     538      1.084
AO03003-3                121      255      167     543              102      49      39     733      1.082


AO03096-5                156      176      54      385              61       44      7      497      1.113
OR03085-5                181      194      124     499              20       32      6      557      1.097
OR03151-4                135      174      196     505              57       80      60     702      1.089
OR04018-5                 49      172      172     393              44       80      57     574      1.094


OR04057-2                102      165      83      350              137      91      24     602      1.095
OR04062-1                142      165      51      357              63       24      13     457      1.100
POR05V016-2              149      222      147     518              54       52      5      629      1.085

Mean1                    107      166      149     422              54       75      42     593      1.092
1
    Mean for standard varieties and selected clones only.




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                                  Russet Potato Variety Development, 2007 Page 5
                            Research in the Klamath Basin
                                 20 07 Annual Report

Table 2. Characteristics of potato entries in the Oregon Statewide Trial grown at the Klamath Basin Research and Extension
Center, Klamath Falls, OR, 2007.
Variety or              Percent Vine             Vine                 Tuber characteristics3          Hollow       Internal       Corky
                                          1             2                                                     4
selection                stand    vigor maturity            skin color    russeting eyes shape        heart                   4
                                                                                                                  brown spot ring spot4

                                                                                                                      %
Russet Burbank            99       4.8           2.4           4.1           4.4      4.0      4.1      0             25            0
Ranger                    99       5.0           3.4           4.0           4.3      3.0      5.0      0             33           25
Shepody                   100      4.0           2.5           1.0           1.8      4.0      3.9      0             18            0
Norkotah                  100      3.5           1.6           4.3           4.5      3.9      4.8     15             0             0

AO96164-1#                98       5.0           2.1           4.0           4.3      4.1      4.1      0             13           13
AO96141-3*                98       5.0           3.6           4.0           4.8      3.8      4.9     13             0             0
AO96305-3*                100      4.0           2.5           3.8           4.0      4.1      4.1      0             20           13
AO96365-2*                100      4.3           3.5           4.0           5.0      3.5      3.0      0             3             8
AO98282-5*                99       5.0           2.8           4.0           5.0      3.5      4.0      3             0             0

AO00057-2*                99       4.3           3.1           4.0           4.5      4.1      3.8      0             13            5
AO98259-6                 98       3.5           2.8           4.0           4.5      3.8      3.8      0             15            0
AO98286-4                 95       3.3           2.6           3.0           3.0      4.3      3.5      0             28           25
AO01057-5*                99       4.0           2.3           4.1           4.8      3.8      3.6      0             3             0
AO02027-6                 99       5.0           1.9           4.0           4.3      3.8      3.9      0             8             3

AO02103-1                 98       3.8           2.6           4.4           5.0      3.4      3.8      0             25            8
AO02182-1*                98       5.0           1.9           4.1           4.1      4.1      4.5      0             5             8
AO02183-2*                98       5.0           3.4           4.0           4.8      3.9      5.0      5             20            0
AO02196-5                 99       5.0           3.8           4.1           4.5      4.1      4.1      0             10            3
OR03029-2                 99       3.3           2.9           4.1           5.0      4.3      2.8      0             0             0

Mean                     98.8      4.3           2.7           3.8           4.3      3.9      4.0     1.8           12.4          5.7
CV(%)                     ----     ----          ----          ----          ----     ----     ----   194.4         122.8         224.1
LSD (0.05)                ----     ----          ----          ----          ----     ----     ----    5.1           21.5          NS
1/
     Vine vigor: 1 = small, weak; 5 = large, robust.
2/
     Vine maturity: 1 = early; 5 = late.
3/
     Skin color: 1 = light; 5 = dark.
     Russeting: 1 = light; 5 = heavy.
     Eyes: 1 = deep; 5 = shallow.
     Shape: 1 = round, 5 = long.
4/
 Percent in 10 large tuber sample
*Retained for further evaluation
#
     To be released




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                                               Klamath Basin Research and Extension Center
                                              Russet Potato Variety Development, 2007 Page 6
                       Research in the Klamath Basin
                            20 07 Annual Report
Table 3. Tuber yield by grade and specific gravity in the Oregon Statewide Trial grown at the Klamath Basin Research
and Extension Center, Klamath Falls, OR, 2007.
Variety or                     Yield U.S. No. 1s                                Yield                 Specific
                      4-8 oz   8-12 oz >12 oz        total                                                          1
selection                                                           Bs   No. 2s     culls    total     gravity rank

                                                         cwt/acre
Russet Burbank          159      101       22        281            86     84           61   512        1.093    13
Ranger                   86      139       126       350            74     60           20   504        1.096     7
Shepody                  66      98        106       270            37    115           45   468        1.085    14
Norkotah                136      150       116       402            51     29           15   497        1.078     3

AO96164-1#              154      101       42        296          89      29            10   425        1.087    11
AO96141-3*               82      127       145       355          73      98            39   565        1.101     6
AO96305-3*               91      124       34        248         156       4             8   416        1.093    15
AO96365-2*              239      151       90        479          65      37             5   587        1.092     1
AO98282-5*              157      132       96        385          67      34            31   518        1.100     4

AO00057-2*              110      132       94        336            43     37           14   430        1.089     8
AO98259-6               110      135       40        284            34     34           19   371        1.084    12
AO98286-4               169      136       57        363            54     31           26   474        1.077     5
AO01057-5*              146      158       127       430            43     24            8   505        1.088     2
AO02027-6               100      101       17        218            61    117           54   450        1.091    18

AO02103-1               106      122       95        323          30      60            25   438        1.086    10
AO02182-1*               96      128       103       326          47      24            13   410        1.078     9
AO02183-2*               48      113       62        223         151      35            34   443        1.100    17
AO02196-5                97      96        44        236          68      76            46   426        1.101    16
OR03029-2               137      26         4        167         195      18             9   390        1.106    19

Mean                   120.3    119.4      74.7     314.4        75.1    49.7       25.4     464.6      1.091
CV (%)                  24.8     24.3      47.2      22.4        26.3    41.3       61.6      16.0       0.3
LSD (0.05)              42.2     41.1      49.9      99.6        28.0    29.1       22.2     105.4      0.005
1/
  Rank: ranking in total U.S. No. 1 yield for KBREC out of 19 entries.
*Retained for further evaluation
#
  To be released




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                                   Klamath Basin Research and Extension Center
                                  Russet Potato Variety Development, 2007 Page 7
                        Research in the Klamath Basin
                             20 07 Annual Report
Table 4. Characteristics of potato entries in the Western Regional Russet Trial grown at the Klamath Basin Research and
Extension Center, Klamath Falls, OR, 2007.
Variety or            Percent Vine         Vine                Tuber characteristics3          Hallow         Vascular       Corky
                                       1          2                                                     4
selection              stand    vigor maturity        skin color russeting eyes shape           heart                    4
                                                                                                            discoloration ring spot4

                         %                                                                                        %
Ranger Russet            98      4.3       3.9          3.9          4.4      3.1       5.0       0               0           58
Russet Burbank          100      5.0       2.9          4.0          4.8      3.9       4.4       0               0           23
Russet Norkotah          99      4.0       1.8          4.3          5.0      3.9       4.5       5               0            0

A95409-1                100      4.0       3.8          3.4          3.9      3.5       3.8       0              5            28
A96104-2                100      4.8       2.8          4.0          4.9      3.5       4.3      33              3            15
A97287-6                 98      5.0       3.6          3.4          4.0      3.1       4.0       0              20           13
AC96052-1RU              99      5.0       3.3          4.3          5.0      4.0       3.6       5              3            28
AO96141-3               100      5.0       3.5          3.8          4.9      3.8       4.9       0              3            20

AO96164-1               100      5.0       2.5          4.0          4.5      4.0       4.6       0               0            3
AOA95154-1               99      4.8       3.4          4.0          4.8      4.1       3.9       3               0           18
AOA95155-7              100      4.5       3.5          3.6          4.8      4.1       3.8       0               0           15
AOTX95265-2ARu           96      4.3       2.0          4.5          5.0      3.9       4.0      10               5            8
AOTX95265-3Ru            99      4.5       2.5          4.4          5.0      3.8       4.5       5               3            3

AOTX95265-4Ru           98       4.5       2.1          4.1          5.0      3.8       4.4       8               0            5
CO95172-3RU             99       5.0       3.5          4.0          5.0      3.8       4.0       3               0           18
CO97087-2RU             99       4.3       2.6          3.9          4.9      4.0       4.4       0               0            0
CO97138-3RU             99       4.0       2.0          4.0          5.0      4.0       4.3       0               0            5
CO97138-7RU             98       3.3       3.4          3.8          4.0      3.6       4.6       3               3            0
TXA549-1Ru              99       4.3       3.8          4.0          4.4      4.0       3.0      13               0            5

Mean                    99       4.5       3.0          4.0          4.7      3.8       4.2      4.5            2.2           13.7
CV (%)                  ----               ----         ----         ----     ----      ----    134.5          240.3         147.9
LSD (0.05)              ----               ----         ----         ----     ----      ----     8.5            7.6           28.7
1/
   Vine vigor: 1 = small, weak; 5 = large, robust.
2/
   Vine maturity: 1 = early; 5 = late.
3/
   Skin color: 1 = light; 5 = dark.
   Russeting: 1 = light; 5 = heavy.
   Eyes: 1 = deep; 5 = shallow.
   Shape: 1 = round, 5 = long.
4/
   Percent in 10 large tuber sample




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                                     Klamath Basin Research and Extension Center
                                    Russet Potato Variety Development, 2007 Page 8
                         Research in the Klamath Basin
                              20 07 Annual Report
Table 5. Tuber yield by grade and specific gravity in the Western Regional Russet Trial grown at the Klamath
Basin Research and Extension Center, Klamath Falls, OR, 2007.
Variety or                     Yield U.S. No. 1s                                  Yield                Specific
                                                                                                                    1
selection               4-8 oz 8-12 oz >12 oz        total     <4 oz    No. 2s        culls    total   gravity rank

                                                        cwt/acre
Ranger Russet              89      146       90      325        70          74            26   495      1.097     13
Russet Burbank            119      113       65      297        76          109           46   528      1.091     14
Russet Norkotah           126      152      144      422        53          59            16   549      1.075      3

A95409-1                   99      130      174      403        41          68            11   522      1.095      4
A96104-2                  100      156      112      368        58          36            10   472      1.086      6
A97287-6                  115      139      100      354        48          84            24   510      1.090      8
AC96052-1RU               101       90       49      239        46          15            15   315      1.088     18
AO96141-3                  52       97       63      211        96          53            31   391      1.101     19

AO96164-1      171                 117       94      382        82          120           15   599      1.090      5
AOA95154-1     126                 122       37      285        75          13             3   376      1.091     15
AOA95155-7     125                  94       34      254        70          44             5   372      1.083     16
AOTX95265-2ARu 94                  132      141      368        41          44            27   479      1.076      7
AOTX95265-3Ru   98                 130      110      338        50          62            39   489      1.078     12

AOTX95265-4Ru              82      127      134      344        39          57            22   461      1.077     11
CO95172-3RU               160      134       52      346        85          49            17   497      1.095      9
CO97087-2RU               124       83       37      244        60          92            16   412      1.090     17
CO97138-3RU                83      145      117      346        30          31            10   417      1.079     10
CO97138-7RU                90      135      229      454        31          78            25   589      1.077      1
TXA549-1Ru                 88      130      209      427        30          79            42   578      1.088      2

Mean                      107      125      105      337        57          61            21   476      1.087     ----
CV (%)                     25       25       45       20        26          51            82    14      0.362     ----
LSD (0.05)                 39       44       67       96        21          44            25    94      0.006     ----
1/
     Rank: ranking in total U.S. No. 1 yield for KBREC out of 19 entries.




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                                     Klamath Basin Research and Extension Center
                                    Russet Potato Variety Development, 2007 Page 9

				
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