Peanut and Oil Palm Foliar Diagnosis Interrelations of N, P, K, Ca, Mg.

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Abstract
Detailed results of a typical peanut experiment are reported to show the method used in foliar diagnosis. General results are given for the peanut and oil palm, and from these results critical levels of N, P, and K are approximated for both plants. Interrelations of elements are discussed from the standpoints of the ratios and correlations between N, P, K, Ca, and Mg. Correlations between N and P are generally positive; correlations between K and Ca or K and Mg are negative, while correlations between Ca and Mg are positive. In the oil palm such correlations may disappear when the sum K + Ca + Mg is lower than 2.0. The elements thus far analyzed have been subdivided into two large classes the "protoplasmic class" for N and P, and the "basic elements class" for K, Ca, and Mg.