The Relationship of Nitrogen in Corn Leaves to Yield

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Abstract
The propriety of specifying rates of N fertilization by the use of the N content of the leaves of corn was evaluated.Steep slopes of both curves relating yield and N content of corn leaves to rates of N fertilization were associated with high correlation coefficients for the former two variables. These correlation coefficients consistently decreased, often becoming negative, as the rates of N fertilization were increased.An evaluation also was made of the percent N of corn leaves corresponding to the economic optimum yields and maximum yields of grain for the fertility experiments at 38 locations.Even though there may be good correlation between yield and N in the leaves, N content of leaves was a poor indicator of the rate of N fertilization. This was true for both economic optimum and maximum yields. The use of the percent N in the leaf should therefore be limited to the comparison of the effect of known factor variation under research conditions and not for the prediction of rates of fertilizer application.
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