Integrated Crop Management News

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Mounting evidence indicates that fall-applied nitrogen (N) is converted to nitrate much more rapidly than has been generally believed in Iowa. Observations made last December add to this evidence. Soil samples were collected in mid-December from three fields that received anhydrous ammonia in mid-November. The fields were in Greene County, and soil samples were collected from a total of 25 test areas within the fields. The test areas were selected to represent the range in soil characteristics within each field. Samples were collected to a depth of 18 inches in and between injection bands within each test area.

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Iowa State University



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