Correlation studies among soil and leaf nutrient levels and coconut yield [Philippines].
1986
Limbaga C.M.
The results showed that most of the soil and leaf parameters studied were significantly correlated with coconut yield in the flat areas regardless of landform. Drainage and soil texture of the topsoil and subsoil layers in the same landform did not show significant correlation. In the coastal upland, only soil pH and soil K were significantly associated with coconut yield, while in the inland upland yields were more associated with organic matter, exchangeable Ca and CEC. Generally, however, most of the leaf nutrients evaluated in all landforms were correlated with coconut yield, especially in the inland upland. Regression analysis revealed that most of the soil chemical properties and leaf nutrients were directly related to yield to some extent. On the other hand, magnesium was inversely related with coconut yield due probably to its antagonistic effect with other cations, particularly in relation to K. Higher N and K, P and K, Ca and K, and Mg and K ratio in the soil all depressed coconut yield. Between H2SO4-extractable and exchangeable K, the former appeared more closely related to leaf K, and so it is a better indicator in predicting the K content of the coconut leaves. In general, the leaf nutrients which were positively correlated with soil pH, were inversely related with organic matter content of the soil, and vice versa. Some of the elements in the soil and in the coconut leaves were noted to give critical values which were in accordance with the standard critical values already reported.
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