POTASSIUM, CALCIUM, AND MAGNESIUM IN TUNG LEAVES AS RELATED TO THESE IONS IN THE SOIL

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Abstract
An attempt was made to relate the K, Ca, and Mg contents of tung leaves to the same elements found in the soil under the trees when the leaf samples were taken. Correlation coeffs. were calculated for 51 pairs of samples taken from a wide range of different soil types. Leaf K was not significantly correlated with milliequivalents Of K in the soil but was highly significantly correlated with the percentage of saturation of K in the soil. Leaf Ca was highly significantly correlated with Ca in the soil, and the correlation with the degree of saturation of Ca was even greater. The coeff., +0.72, for correlation between leaf Ca and the ratio of Ca to K plus Mg in the soil had very high statistical significance. For the entire series of samples, leaf Mg was not significantly correlated with soil Mg; for the leaf samples in which the Mg was less than 29 .me./100 g., however, a highly significant correlation was found with the degree of Mg saturation of the soil. Leaf Mg was negatively correlated to a highly significant degree with the percentage saturation of K in the soil.

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