Fertilizer Nitrogen and Crop Rotation in Relation to Movement of Nitrate Nitrogen Through Soil Profiles
1970
Olsen, R. J. | Hensler, R. F. | Attoe, O. J. | Witzel, S. A. | Peterson, Laurence A.
Recovery of fertilizer N by three successive corn (Zea mays L.) crops and as inorganic N in the soil profile following the last crop ranged from 72 to 88%. Total amount of NO₃-N in the soil profiles was directly related to the rate of N application and to the frequency of corn in the rotation. More leaching of NO₃-N generally occurred between fall and spring samplings than during the growing season. The most effective methods indicated for limiting the amounts of NO₃-N passing through the soil profile to the water table include: limiting rates of N fertilizer to approximately that required by the crop, reducing the acreage and frequency of corn or other crops that received fertilizer N in the rotation, and maintaining a crop cover on the land as much of the time as is feasible.
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