Building a Maximum Yield Cropping System for Corn, Wheat and Double-cropped Soybeans


02 May 2002

2001 Annual Interpretive Summary

Building a Maximum Yield Cropping System for Corn, Wheat, and Double-Cropped Soybeans, 2001

The goal of this study is to develop a management program that increases crop yield, input efficiency, and profit potential in a predominantly no-till cropping system. This cropping system consists of four crops in three years: no-till soybeans in corn stubble, followed by minimum till wheat double-cropped with no-till soybeans, and then no-till corn. The rotation has clearly improved corn and soybean yields compared to continuous cropping.

During 1997, a record yield of wheat was harvested, 151 bu/A compared to the Maryland state average of only 60 bu/A. In 2001, hard red winter wheat yielded up to 123 bu/A with over 13 percent protein, when fertilized with a combination of solid and foliar nitrogen (N) applications.

Starting in 2000, blends incorporating ammoinium sulfate [(NH4)2SO4] as part of the N source have been tested for no-till corn. Nitrogen use efficiency has appeared to improve when (NH4)2SO4 was blended into the N source, either urea or ammonium nitrate (NH4NO3). In 2001, yields were 10 bu/A higher with a blend of liquid (NH4)2SO4 and urea ammonium nitrate (UAN) than with UAN alone. However, studies with varying proportions in the blend suggest that the maximum benefit is achieved with 14 to 21 lb N/A supplied as (NH4)2SO4. Corn yielded 10 bu/A more with an NPKS starter and broadcast N combination, as compared to the same amount of nutrient broadcast. MD-06F