ISU Extension: How Plant Date Affects Iowa Soybean Yields

June 12, 2013 10:49 AM
 

With more rain moving through the Corn Belt today, there is increasing concern about soybean planting progress and even the need for some replanting. Iowa State University Extension offers some valuable resources for making these decisions, including the following table that breaks down the effect of planting date on yield in Iowa:
 

06 12 13 Soybeans Img 1

 

Interaction between planting date and maturity group on physiological maturity date, days from VE to R8, and relative yield for soybeans grown in Iowa, 1997

Planting dates

Maturity group

 

2.2

2.5

2.9

 

Datea

Daysb

Relativec

Date

Days

Relative

Date

Days

Relative

 

Yield (%)

Yield (%)

Yield (%)

Late April

9/30

137~

100

9/17

132

100

9/25

131

100

Mid-May

10/3

134

96

9/21

118

91

9/25

126

88

Early June

10/5

116

91

9/26

107

72

10/1

111

75

Late June

10/14

108

67

10/2

99

61

10/6

103

54

Early/mid-July

10/14

104

61

10/15

95

38

10/15

99

40

                                 

 

a Harvest date (month/day).

b Days between growth stages VE to R8.

c Relative yield = percent of potential yield for the average of six varieties.

 

 

 

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