Evaluation of Fertilizer Nitrogen Applications With and Without Ammonium Sulfate in Selected Vegetable Crops
IPNI-1999-USA-MD11
31 Jan 2005
2004 Annual Interpretive Summary
Evaluation of Fertilizer Nitrogen Applications with and without Ammonium Sulfate in Selected Vegetable Crops, 2004
The objective of this study is to measure the influence of ammonium sulfate (AS) blended with ammonium nitrate on the yield of irrigated sweet corn. In 1999, sweet corn yields increased from 1.6 to 6.5 t/A in response to application of 120 lb of nitrogen (N)/A. During the 2000 season, blending AS into the N supply increased the yield of sweet corn by 5%. Yields as high as 8.3 t/A were achieved when AS was applied at row closure. In 2002, top yields were about 5.8 t/A and were unaffected by N source. In 2003, strip-tilled sweet corn yielded as high as 9 t/A with a blend including AS...16% higher than when fertilized with urea alone. In 2004, poor growing conditions resulted in low yields, but blending AS into the N supply increased yields 10% compared to urea alone. Split application of N boosted yield by an additional 24%. MD-11F