Soil:

Embden sandy loam and Hecla sandy loam; pH=6.5; 2.2% organic matter; soil-P and soil-K was very high; soil-S was medium.

Previous crops:

2004 - cabbage; 2003 - sweet corn and field corn; 2002 - winter squash and pumpkin.

Seedbed

preparation:

Chisel plow on April 14. Disked on May 6. Multiweeded (field cultivated) twice on May 19 to incorporate fertilizer and herbicide, and to smooth the seedbed.

Planting:

Planted on May 23, May 24 and May 26 in 10, 20 and 30-inch rows. All beans were inoculated just prior to planting.

Plots:

Plots were 17 ft long by 12 ½ ft (6, 8 or 12 rows) wide. The study had 4 reps.

Fertilizer:

On April 15 broadcast 26 lbs N/acre and 30 lbs S/acre as 21-0-0-24.

Irrigation:

Surface drip irrigation as needed.

Pest

control:

Applied Treflan (1pt/acre on May 19, preplant incorporated), Raptor + NIS (4 oz/acre + 0.25% v/v on June 7), Glypohasphate + NIS (16 oz/acre + 0.5% v/v on July 7 and July 20) and Gramoxone + NIS (12.8 oz/acre + 0.125% v/v on September 22).

Harvest:

Harvested on October 3 with a Hege plot combine.

Early

stand¹

Percent of

desired stand

Grain

yield²

Grain

moisture

1000s/acre

%

bu/acre

%

Variety

91B03

105

71

55.4

9.3

91M11

111

74

57.5

9.5

Probability for varieties

0.0503

0.07

0.07

<.0001

Row Spacing

10 inch

108

72

55.7

9.4

20 inch

109

73

57.2

9.4

30 inch

107

72

56.4

9.4

Probability for row spacing

0.89

0.96

0.53

0.32

Population (seeds/acre)

100,000

73 c³

74

55.1

9.4

150,000

108 b

72

57.2

9.4

200,000

143 a

71

57.1

9.4

Probability for population

<.0001

0.39

0.18

0.39

Interaction probabilities

Variety by row spacing

0.87

0.79

0.93

0.71

Variety by population

0.07

0.07

0.13

0.06

Row spacing by population

0.75

0.81

0.004⁴

0.014⁴

Variety by row spacing by population

0.89

0.84

0.28

0.87

CV (%)

9

8

7

1