2002 Colorado Soybean Variety Performance Results


             Growing demand for soybean production information gave rise to soybean variety testing on a statewide basis in 2001. Colorado State University began this testing effort to provide unbiased and reliable variety information to Colorado soybean producers to help them make better variety decisions.

             2002 was the second year of testing soybean varieties at Yuma. The 2001 trial was severely compromised by hail. Our second attempt at soybean variety testing at Yuma was more successful, without hail and with vigorous vegetative growth, but yields were depressed by high temperatures and mediocre seed set. This sprinkler irrigated trial included only Roundup Resistant varieties. Yuma has a relatively long growing season (average 2615 corn growing degree days) and appropriate for Group 2 maturity varieties.

             Rocky Ford, site of soybean variety trials for several years, has a longer growing season (2837 corn growing degree days) and can produce late Group 3 or early Group 4 maturity soybeans. We are extremely pleased with the high yields in this trial at the Arkansas Valley Research Center at Rocky Ford. This may be a record high yield for soybeans in Colorado and gives a rare glance at variety performance under high yield conditions. The trial was furrow irrigated and both conventional and Roundup Resistant varieties were included where conventional herbicides were used. Plots in both trials consisted of four rows, each 36 ft long. Yields are expressed at 13% grain moisture as bu/ac with 60 lbs of soybeans in one bushel.


Soybean performance at Rocky Ford1 in 2002.

 

 

 

Test

Plant

Leaf

Variety

Yield

Moisture

Weight

Height

Dropping2

 

bu/ac

%

lb/bu

in

date

DG 3399 + RR

88.6

8.5

54.4

39

272

Syngenta S39-Q4

87.7

10.8

53.5

39

276

Garst 3135 (RR)

83.5

8.4

55.6

32

262

Triumph TR3752RR

80.8

8.8

55.6

41

271

Pioneer brand 93B85

79.8

8.6

55.1

36

267

DG 3390 N RR

78.4

8.7

54.9

38

272

US Seeds US S4002 (RR)

77.2

8.7

55.2

36

273

Pioneer brand 93B68

75.5

8.5

56.6

33

264

Pioneer brand 93B72

74.5

9.1

55.0

37

266

US Seeds US S3902 (RR)

74.3

9.9

55.1

39

273

AG3701 + Myconate +

72.2

8.6

56.3

34

268

DG 3388 RR

69.3

8.6

55.3

41

271

Garst 355 (RR)

68.5

8.4

56.6

35

263

AG3701 + Myconate -

65.6

8.7

56.3

38

269

Garst 3083 (RR)

62.8

8.7

55.4

30

260

Average

75.9

8.9

55.4

37

269

LSD(0.30)

5.1

 

 

 

 

1Trial conducted on the Arkansas Valley Research Center; seeded 5/16 and harvested 10/7.

2Julian date.

*Myconate® is a trademark product of VAMTech, L.L.C., commercially available for enhancing mycorrhizal colonization.


Soybean performance at Yuma1 in 2002.

 

 

 

Test

Plant

 

Variety

Yield

Moisture

Weight

Height

Shatter

 

bu/ac

%

lb/bu

in

rating2

ASGROW AG3003

47.2

8.0

55.6

33

1.0

DGX 432 RR

42.8

7.7

53.4

34

1.0

ASGROW AG2703

42.4

8.2

53.8

34

1.0

DEKALB DKB26-51

41.8

8.2

56.4

32

1.0

DG 3270 RR

41.5

8.6

56.1

39

1.0

DG 3287 RR

41.4

7.7

56.2

31

1.0

Syngenta S29-C9

40.5

7.8

54.1

36

1.0

DEKALB DKB24-51

40.5

7.8

56.6

28

1.0

US Seeds US S2503 (RR)

39.6

7.6

55.4

32

1.7

Garst 2677 (RR)

39.1

7.5

56.6

31

1.0

US Seeds US S2703 (RR)

37.3

8.3

53.8

35

1.0

Pioneer 91B91 + Myconate +

36.6

7.8

51.3

30

1.0

Garst 2332 (RR)

33.2

7.7

56.9

29

1.0

DEKALB DKB23-51

33.2

7.6

57.6

30

1.0

Pioneer 91B91+ Myconate -

30.3

8.0

55.4

28

1.0

Garst 2603 (RR)

29.7

7.9

51.5

33

1.0

Average

38.6

7.9

55.0

32

1.0

LSD(0.30)

5.0

 

 

 

 

1Trial conducted on the Rod Hahn farm; seeded 5/14 and harvested 10/1.

2 Rating scale 0-10.

*Myconate® is a trademark product of VAMTech, L.L.C., commercially available for enhancing mycorrhizal colonization.