Abstract
In order to find out the factors affecting peanut fruit filling, some experiments were conducted concering the relation between the calcium absorption by the fruit and its carbohydrate contentes. The results of experiments were as follows: 1. Ca45 supplied on one side of the plant could scarcely be detected on the opposite side of the same plant. Labeled calcium was found to be translocated from the vegetative tissues to the fruiting organs when it was not applied to the fruiting zone where the gynophores reach, while the translocation was not proved when labeled Ca was added in that zone. 2. The most benefical period for supplying calcium was found to be from 10 days to 30 days after the gynophores had reached the sand. Much calcium supplied in other periods was absolutely irrelevant to the normal seed development. 3. There was a high correlation between carbohydrate and calcium contents in pod at the growing stages. Contents of reducing and non-reducing sugar in calcium supplied shells were always higher than those in calcium deficient ones, but starch contents were high even in calcium deficient shells. On the other hand, the correlation between carbohydrates and calcium was not recoginized in the growing stage of seed.
