Function of Leaves in Soybean Plants : 1. Growth, dry matter, nitrogen, phosphorus, potassium and carbohydrate contents of each leaf

[摘要] In order to clarify the function of leaves in soybeans, growth and constituents in each leaf were examined every two weeks. The results obtained are as follows: 1) The leaves expanded about 10 days after the emergence of the leaves and grew large for two weeks after that period. The length of upper leaves were commonly larger than the lower ones, however, several ones at tips became smaller. 2) The content of nutrients in each leaf increased as growing and became largest at the period of about one week after when the length of leaves became largest, and after that period decreased gradually. The changes of the content of nutrients had almost same tendency between leaves, however, were not volumetrically. 3) The life of lower leaves was shorter than the upper ones and the almost constant life after the emergence of the branch from the definite section was observed in lower leaves. The primary and the 1st leaf are connected deeply with the early growth and the other lower leaves with the branching. 4) The upper leaves had longer life than the lower ones, had pretty long duration of high nutrient contents and had close relationships with the flowering and the fruiting.

[学科分类] 农业科学（综合）