Yield Response of Soybean Products to Seeding Rate and Planting Date
In recent years there has been more interest in planting soybeans earlier in the planting season.
The objective of this experiment was to evaluate the yield response of different maturity group soybean products across different seeding rates and planting dates.
Research Site Details
Asgrow® soybean products and maturity groups (MG) planted in this trial:
— AG49X6 brand, MG 4
— AG56X8 brand, MG 5
— AG64X8 brand, MG 6
— AG74X8 brand, MG 7
There were two different planting date categories, mid-May (PD1) and mid-June (PD2).
Soybean products were planted at 80,000, 110,000, and 140,000 seeds/acre across locations and planting dates.
Plots were single strip trials that were approximately 0.5 acres.
Data was collected using Climate FieldView™, and all agronomic practices were per local standards.
Understanding the Results
Results from this study are consistent with previous data showing that soybean yield potential is greater when soybeans are planted earlier. This year’s data showed, on average, as much as a 14 bu/acre yield advantage when soybeans were planted in mid-May vs. mid-June (Figure 3).
In terms of seeding rate, when soybeans were planted in mid-May the 80,000 seeds/acre rate yielded the same or better than the higher seeding rates. In mid-June, the 110,000 seeds/acre rate yielded better.
AG49X6 and AG56X8 brands had a much higher yield potential when planted in mid-May compared to AG64X8 and AG74X8 brands. Yield potential was similar across all products when soybeans were planted in mid-June.
What Does This Mean for Your Farm?
Earlier planting dates for this trial had a higher yield potential than later planting dates.
This trial showed that fewer seeds per acre are needed when soybeans are planted earlier.
Consider testing different seeding rates on your own farm. Too many seeds per acre may actually reduce yield potential.