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This article in AJ

  1. Vol. 58 No. 5, p. 536-539
     
    Received: Mar 18, 1966
    Published: Sept, 1966


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doi:10.2134/agronj1966.00021962005800050025x

Fertilizer Nitrogen: Its Role in Determining Crop Yield Levels1

  1. O. P. Engelstad and
  2. G. L. Terman2

Abstract

Abstract

The frequency and magnitude of crop response to N was found to be generally greater than those to P and K in representative cropping areas of the humid region of the United States. P and K are rather immobile nutrients and crop recovery is lower than for N. Consequently, P and K tend to accumulate in most soils as a result of fertilizer applications. In contrast, N acts as a relatively mobile nutrient and crop requirement and removal tend to be high. Since N is also lost from soils by leaching and volatilization, little accumulation occurs in humid areas and applications need to be made largely on the basis of current crop needs.

Results of this study have important implications for soil testing, the need for high P water solubility, and the present number of fertilizer grades and ratios.

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