CALCIUM TRANSFER FROM MINERAL TO PLANT THROUGH COLLOIDAL CLAY

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Abstract
A study was made of the transfer of Ca from anorthite to soybean plants. The direct contact effect of the plant root was investigated and compared with a transfer as brought about by the weathering action of acid colloidal clay. In the latter the Ca was made available to the plant from the exchange complex of the clay through contact exchange. The plants grown were analyzed for Ca and other elements. Ca transferred from the mineral anorthite to the plants when the plant roots were in contact with the mineral. However, the plants grown on the colloidal clay anorthite substrate took up much larger amts. of Ca, grew better, and contained larger amts. of the other nutrients. Observations regarding available and slowly available plant nutrients were noted.

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