Studies on Peg Elongation of Peanut Plant

[摘要] It is necessary for the fructification of peanut that after flowering the peg elongations and penetrates into the soil. The authers examined the peg elongation and the relation of that to the fructification of peanut, and obtained the following results. 1. Above the ground, the peg elogated at the remarkable rate from a week after. flowering, reached ultimately a length of 15 to 16cm. It was observed that the peg length was reduced with the delay in the flowering date. 2. The peg length of the pods was varied with varieties, namely, was shorter in the order of Chiba No.43 (runner type), Chiba-handachi (intermediate type), and Java No.13 (erect type). The peg length of the pods was shortened with the delay in the sowing time, and that of themat ure pods was shorter than that of the immature pods. 3. The pegs borne on the high position branch of the main stem, on the high order branch and on the node near the apex of the branch required the long terrestrial elongation to penetrate into the soil and to fruit. 4. It was recognized that there were the high negative correlations between the peg length and the weight of one mature pod and of one seed. The similar correlation between the peg length and the weight of one seed (r =-0.824**) was obtained, when the terrestrial peg elongation was varied by changing artificially the distance of the branch from the ground.

[学科分类] 农业科学（综合）