Evaluation of Fertilizer Nitrogen Applications With and Without Ammonium Sulfate in Selected Vegetable Crops
IPNI-1999-USA-MD11
22 Apr 2008
2007 Annual Interpretive Summary
Evaluation of Fertilizer Nitrogen Applications with and without Ammonium Sulfate in Selected Vegetable Crops, 2007
The objective of this study is to evaluate the effectiveness of ammonium sulfate (AS) in a rotation of potatoes with wheat/doublecrop soybeans, corn, and single-crop soybeans under irrigation with different levels of tillage.
Fertilizers containing AS produced slightly lower potato yields in 2006 and slightly higher yields in 2007, compared to conventional N sources, with at best an average yield benefit of 1 to 2%. Fertilizer containing AS boosted wheat yields by 17% in 2007 compared to sources containing urea and ammonium nitrate. Applied to corn in 2007, AS modestly increased yields. Nitrogen fertilizers applied to doublecrop soybeans resulted in no yield benefits in 2007. MD-11F