Abstract
(...) The Magdoff Pre-Sidedress Nitrate Test (PSNT) is a soil test that provides more accurate fertilizer N recommendations for corn than previous N recommendation systems based on anticipated effects of manure and crop management. Using the test can result in significant reductions of fertilizer N use on high-N supplying soils. This article provides the background for understanding how and why this soil test functions for corn in the humid regions of the Midwest and Northeast. The pattern of high-crop N uptake rates relative to mineralization indicates that adequate nutrition requires the presence of a large available N pool in the oil at the start of corn's period of rapid growth. (...)
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