Study on Nutrition and Physiology of Soybean (1) Response of Fall Crop Soybean to Nitrogen
H. Y. Huang
This experiment was carried out at Tainan DAIS. Four types of soybean varieties were tested to nitrogen response for nutritive and physiological reactions. Soybean was sown in September, 1978 and harvested in November. Sampling of plants for leaf area index, dry matter, N, P, K. Ca and Mg analysis were at 10-day intervals. Based on the results of this experiment, it may be concluded that the seed yields of short plant and early maturing varieties were more affected by nitrogen nutrition, but those of high plant and late maturing varieties were less. The dry matter was the weightiest on 50 days after emergence. The concentrations of N, P, K were higher on 20~40 days after seed germination, and the concentrations of Ca, Mg were irregular.