Soil Testing to Guide Nitrogen Fertilization in Manured Cornfields

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1995-11-30
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Blackmer, Alfred
Hansen, D.
Mallarino, Antonio
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Proceedings of the Integrated Crop Management Conference
Iowa State University Conferences and Symposia

The Iowa State University Integrated Crop Management Conference is Iowa's premier crop production education event. No other program in Iowa brings together the diverse range of topics, slate of expert presenters and results of the latest University research.

The ICM Conference offers workshops focusing on the latest in crop production technology. Experts from Iowa and surrounding states will provide research updates and results in soil fertility, soil and water management, crop production and pest management.

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Abstract

Land application of animal manures can supply N needed for com production. The amounts of N supplied, however, vary greatly with source of manure, type of storage, method of application, time of application, rate of application, and weather after application. A major problem is that substantial losses of plant-available N by ammonia volatilization, leaching, denitrification, and/or immobilization frequently occur soon after the manure is applied. Another problem is that it is difficult to determine how rapidly N in the manure becomes available to plants. These problems make it difficult to estimate how much fertilizer N should be applied.

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