In-Season Nitrogen and Sulfur application to the footslope field position

Trial Type

N Fertilizer, Other

General Stats

County
Minnehaha
Replications
4
Crop
Soybean
Seed Brand
No Value
Variety
No Value
Relative Maturity
1.0
Tillage
Conventional Till
Irrigated
No Value
Drain Tile
No Value
Previous Crop
Corn
Row Sapcing
30"
Plant Population
160000
Plant Date
15/05/2021
Cover Crop
No Value
Seed Treatment
No Value

Soil Stats

Soil Type
Fine
Soil pH
4.0
Organic Matter
No Value

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.

Rainfall

Temperature

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)

Insecticide Applications

Fungicide Applications

Herbicide Applications