| Two kinds of super absorbent polymers, SAM and SA, were coated on soybean seeds under pot culture experiments to investigate their effects on photosynthesis, transpiration and water use efficiency (WUE) of the plants. The results showed that the emergence date of coated soybean was brought forward by 1224 h, and the emergence rate was improved by 4.6%27.3%. The coating promoted the early growth of soybean, resulting in the improvement of net photosynthetic rate and the increase of photosynthetic production accumulation and water use efficiency. It was also found that the effect of absorbent polymer SAM was superior to that of SA, and the concentration of 1% was more effective than 3%. |