Ammonium Sulfate and Ammonium Sulfate Nitrate Application on White Potatoes
IPNI-2009-USA-MD14
14 Mar 2011
2010 Annual Interpretive Summary
Ammonium Sulfate and Ammonium Sulfate Nitrate Application on White Potatoes, 2010
Managing plant nutrition for potatoes can be challenging since the crop’s nutrient demands are high, and so is its potential for impact on soil and water quality. This experiment examines the effects of N sources for potatoes grown in rotation with wheat, soybeans, and corn within strip-till and no-till management systems.
In 2009, urea and ammonium sulfate applied pre-plant proved to be equally effective for increasing potato yield. Highest potato yields were obtained when urea and ammonium sulfate were applied pre-plant, followed by side-dressing with urea and ammonium sulfate nitrate.
In 2010, including no-till corn in the rotation increased potato yields by 25 cwt/A above those with strip-till corn. Both fertilizer treatments that included ammonium sulfate increased potato yields by 30 cwt/A compared to urea as the primary N source. Blends of ammonium sulfate with urea performed equally compared to those with ammonium nitrate. MD-14F