Managing Soybean for High Yield
- Desire for higher soybean yield has produced considerable interest in utilizing additional management practices that may increase yield.
- Identify cropping management practices that improve soybean yield.
- Determine interactions between geography, weather, varieties and cropping management on yield.
The following strips/treatments were implemented at 25 sites in 2011 and 30 in 2012 (see map below):
- Strip 1 = Untreated seed
- Strip 2 = PPST (Pioneer Premium Seed Treatment)
- Strip 3 = PPST + foliar fungicide and insecticide
- Strip 4 = PPST + foliar fungicide and insecticide + nitrogen fertilizer
PPST (ST): Pioneer Premium Seed Treatment includes imidacloprid insecticide, trifloxystrobin and metalaxyl fungicides, and a rhizobia inoculant.
Foliar (Fol): Foliar-applied fungicides and insecticides were selected by individual growers and applied at labeled rates at the R3 growth stage.
Nitrogen (N): 100 lb N per acre was sidedressed; most applications were made at full flower (R2).
- The overall yield was very high, averaging 65 bu/acre.
- Soybean yield with each treatment differed significantly (p < 0.03) when compared to any of the other 3 treatments.
- ST increased yield 1.1 bu/acre when compared to the untreated control.
- ST+Fol increased yield 1.7 bu/acre when compared to ST.
- ST+Fol+N increased yield 1.1 bu/acre when compared to ST+Fol.
- The N response was 0.40 bu/acre for short-season (
- The N response was 2.1 bu/acre for full-season (>3 MG) varieties.
- The response to ST and Fol were nearly identical for both short and full-season varieties.
|Influence of seed treatment (ST), seed treatment + foliar fungicide and
insecticide (ST+Fol), or seed treatment + foliar + nitrogen fertilizer (ST+Fol+N)
on the seed yield of soybean grown at 25 locations in 2011 and 30 in 2012.
All treatment comparisons are significantly different (p < 0.03).