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Field Pea Seeding Rate Effects on Yield and Various Agronomic Traits in Northeastern North Dakota, 1997-1999.

 

Bryan Hanson, North Dakota State UniversityLangdon Research Extension Center

Phone 701-256-2582, email bhanson@ndsuext.nodak.edu

 

 

Field pea planting rate trials were conducted at the Langdon Research Extension Center from 1997-1999 and off-station locations in Nelson and Towner counties in 1998 and 1999.The objective of the studies was to evaluate seeding rate effects on yield and other agronomic traits of field peas across northeastern North Dakota.The cultivar �Integra� (yellow-cotyledon) was sown at six seeding rates ranging from 150,000 to 400,000 pure live seed (pls)/acre in a randomized complete block design with four replications at each location.Individual plots were 7 � 6 inch spaced rows x 16 feet long.Stand counts were taken on each plot after emergence.Planting dates ranged from April 30 to May 25 across the locations.Other production practices were followed according to NDSU recommendations.

 

Maximum yields were obtained at 300,000 and 350,000 pls/a at 5 of the 7 locations.When averaged across locations, the 300,000 pls/a planting rate had the highest yield but was not significantly different from the 250,000, 350,000 or 400,000 pls/a seeding rates (Table 1).Stand counts generally increased with seeding rates but varied among locations (Table 2).Percent emergence was highest at the 150,000 and 200,000 pls/a seeding rate.This observation of higher survival rates at the lower seeding rates has been seen in other crops and may be due to self thinning.Days to maturity (Table 3) increased at the lower seeding rates.Seeding rate effects on days to flower, vine length, lodging, test weight and seeds/pound were all non-significant (Table 4).

 

Table 1.Seeding rate effects on field pea yield across several locations, 1997-1999.

 

Yield (bu/a)

Planting Rate

 

 

 

 

 

 

 

7-site

Seeds/Acre

L97

L98

L99

N98

N99

T98

T99

Avg

150,000

65.2

68.0

54.2

48.6

49.7

56.1

39.9

54.5

200,000

60.3

67.6

55.3

49.0

50.0

56.6

41.2

54.3

250,000

62.1

73.5

62.1

48.1

50.6

59.3

47.7

57.6

300,000

63.6

74.4

65.6

49.4

54.2

63.1

49.8

60.0

350,000

62.4

71.1

64.1

49.2

51.5

68.9

51.5

59.8

400,000

59.8

69.9

65.8

46.7

48.9

66.7

50.2

58.3

LSD 5%

5.6

3.2

L=Langdon, N=Nelson County, T=Towner County

 

 

 

 

 

 

Table 2.Seeding rate effects on field pea stand count across several locations, 1997-1999.

 

 

Stand Count (plants/ft2

 

Planting Rate

 

 

 

 

 

 

 

7-site

Avg %

Seeds/Acre

Seeds/ft2

L97

L98

L99

N98

N99

T98

T99

Avg

Emergence

150,000

3.4

3.3

4.1

2.3

3.6

2.7

3.9

2.4

3.2

94

200,000

4.6

4.1

4.6

3.7

5.5

3.4

4.7

2.4

4.1

89

250,000

5.7

5.6

5.6

3.0

5.1

4.9

5.5

3.1

4.7

82

300,000

6.9

7.3

7.0

4.1

6.5

4.3

7.8

4.0

5.9

86

350,000

8.0

7.6

8.5

4.5

8.0

5.9

7.5

4.2

6.6

83

400,000

9.2

9.6

9.0

5.0

10.0

5.8

8.7

3.7

7.4

80

LSD 5%

 

1.4

0.9

 

L=Langdon, N=Nelson County, T=Towner County

 

 

 

 

 

 

Table 3.Seeding rate effect on field pea days to

mature at Langdon, 1997-1999.

 

Days to Mature

Planting Rate

 

 

 

3-site

Seeds/Acre

L97

L98

L99

Avg.

150,000

86

94

98

93

200,000

85

94

97

92

250,000

84

94

97

92

300,000

84

94

97

92

350,000

83

94

97

91

400,000

82

94

96

91

LSD 5%

0.9

1.2

L=Langdon

 

 

 

 

 

 

Table 4.Seeding rate effect on various agronomic traits of

field pea averaged across several locations, 1997-1999.

 

Days

Plant

Test

 

 

Planting Rate

to

Height

Weight

Seeds/

Lodging

Seeds/Acre

Flower

(inches)

(lbs/bu)

pound

(0-9)

150,000

54.2

43.3

62.2

1924

6.6

200,000

54.1

44.7

62.1

1966

6.3

250,000

53.8

45.0

62.1

1931

6.8

300,000

53.8

44.2

61.9

1930

6.9

350,000

53.8

44.4

61.9

1940

6.5

400,000

53.7

43.7

62.0

1963

7.0

LSD 5%

NS

NS

NS

NS

NS