Trial Type
N Fertilizer, Other
General Stats
Soil Stats
Methodology
This trial was conducted in a footslope (lowland) field position. Soybeans were planted in 30-inch rows. Fertilizers were broadcast onto the soil surface at the R3 (early pod) growth stage at 30 lbs N and 15 lb S ac-1. The fertilizer source for nitrogen was polymer coated urea whereas for sulfur it was ammonium sulfate. All treatments were replicated four times, with each plot 10 feet wide and 30 feet long. Harvest was performed with a small plot combine.
Results
Nitrogen+sulfur fertilizer increased yields by 0.5 bu/ac, however it was not statistically significant (Table 1). Dry conditions for several weeks after application may have adversely impacted the treatments, as water is needed to incorporate these fertilizers into the soil for root uptake. However, it appears that an S application around R3 may have potential in upland field positions (see reports from Codington in 2019 and 2020 and Brookings in 2019). Future trials are needed to better-understand this practice.
Applications
Event Date | Type | Application Method | Amount | |
---|---|---|---|---|
R3 | No Value | N | Surface broadcast | 30 lbs / acre (actual) |
R3 | No Value | Other | Surface broadcast | 15 lbs / acre (actual) |
Fertilizer Applications
Event Date | Type | Application Method | Amount | |
---|---|---|---|---|
R3 | No Value | N | Surface broadcast | 30 lbs / acre (actual) |
R3 | No Value | Other | Surface broadcast | 15 lbs / acre (actual) |