ABSORPTION OF CALCIUM BY PEANUTS FROM KAOLIN AND BENTONITE AT VARYING LEVELS OF CALCIUM

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Abstract
Uptake of Ca by peanuts as affected by the type of soil colloid at varying levels of exchangeable Ca was investigated. Relatively pure colloidal materials of the 1:1 and 2:1 lattice types were used and variations in adsorption capacity were provided by dilutions of the material with quartz sand. Criteria to measure the release of bases from these systems were the Ca content of shells and the fruit quality records of peanuts. In all systems the uptake of Ca increased with increasing Ca levels. The Ca contents of peanut shells produced in the kaolinitic systems were higher than in those of the bentonite. This difference due to type of colloid was more pronounced at high degrees of Ca saturation and at the higher cation-adsorption capacity levels (2.4 m.e. per 100 gms.). Uptake of Ca from the kaolinitic systems was more directly related to total Ca present and in the montmorillo-nitic systems absorption was somewhat more directly related to % Ca saturation. The effect of type of clay on release of Ca was evidenced in the quality of fruit produced only in the 2d yr. after the Ca additions. In the kaolinitic type of colloid, fruits of good quality were obtained even at relatively low levels. In the bentonitic system larger amts. of Ca, at high degrees of saturation, were required to produce similar fruit quality.

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