Fertilizer Nitrogen Application This Fall

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2015-10-13
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Sawyer, John
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Integrated Crop Management News
Extension and Experiment Station Publications
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Abstract

Much of the primary fertilizer nitrogen (N) for corn is applied in the spring as pre-plant or sidedress, where efficiency of N use should be greatest. Fall N fertilizer application success can be enhanced by following several suggestions: only use anhydrous ammonia; apply in late fall after soils cool to 50 degrees F (4-inch depth) and are trending cooler (the colder the better, and most years in Iowa this is sometime in November); consider a nitrification inhibitor to further slow nitrification to nitrate; and avoid fall application to soils that are more prone to wetness or leaching (poorly or excessively drained soils).

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Agronomy
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Tue Jan 01 00:00:00 UTC 2002
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