Lower Seeding Rate 110K vs.140K (Medium Yield Zone 35-55 bu/A)

Trial Type

Seeding Rate/ Varieties/ Row Spacing, Medium Yield

General Stats

County
Lincoln
Replications
4
Crop
Soybean
Seed Brand
Syngenta
Variety
NK26P3
Relative Maturity
2.6
Tillage
Conventional Till
Irrigated
No Value
Drain Tile
No Value
Previous Crop
Corn
Row Sapcing
30"
Plant Population
140000
Plant Date
01/06/2017
Cover Crop
No Value
Seed Treatment
No Value

Soil Stats

Soil Type
Fine
Soil pH
4.0
Organic Matter
No Value

Methodology

Methodology: 

Four strips were planted at 110,000 seeds/acre, which were compared to the farmer’s normal rate of 140,000 seeds/acre.

 

 

 

Results

Results: 

Overall, yield loss at the 110,000 seeds/acre reduced seeding rate wasn’t significant. To be significant the average yield change across the 4 strips needed to be +/- 3.36 bushels/acre, which was not met at -1.16 bushels. It’s important to note that reduced seeding rate had decreased yields in the Ws soil type area, and increased yields in the WhA soil type. Therefore the 110,000 seeding rate appeared to increase yield in some areas and decrease yields in others, but the average yield change across the strips, was not significant for the medium yielding soybeans. These results show the potential for variable seeding rates in SD soybean production.

Acknowledgments:

Funding provided by South Dakota Soybean Research and Promotion Council.

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