Building a Maximum Yield Cropping System for Corn, Wheat and Double-cropped Soybeans
IPNI-1990-USA-MD6
10 May 2010
2009 Annual Interpretive Summary
Building a Maximum Yield Cropping System for Corn, Wheat, and Doublecropped Soybeans, 2009
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 planted over 3 years, including: no-till soybeans in corn stubble, followed by minimum-till wheat double-cropped with no-till soybeans, and then no-till corn.
In research on the Eastern Shore of Maryland, N use efficiency in corn and wheat has improved when ammonium sulfate (AS) was blended with either urea or ammonium nitrate (AN). Research in 2009 again confirmed that blends containing an amount of AS sufficient to supply 30 lb/A of S produced corn yields higher than those achieved with granular urea applied pre-plant. Despite a drought year, these blends produced corn yields of around 120 bu/A with a total application of 120 lb/A of N. Blends of ammonium nitrate with ammonium sulfate and urea produced yields as high as those with ammonium sulfate and urea in no-till and higher than those with ammonium sulfate and urea in strip-till. MD-06F