Study on compensation effects of nitrogen and water stress duration in the yield of soybean

Our objective is to investigate the threshold scope of water stress duration and nitrogen fertilizer, which makes soybean yield produce compensatory effects. The compensation effects test in soybean vegetative growth period was devised. The results showed that, under the conditions of 45% relative soil water, compensatory effects of long stress duration and high nitrogen were more notable than short stress duration and low nitrogen after rewatering, the processing yield of 14N3 achieved the maximum compensation, but 7N1 was the least. According to the test data, the threshold range of nitrogen and stress duration could be identified; it was a series of different combinations of stress duration and nitrogen. In 37-182.6 kg/hm(2) range of nitrogen, the soybean yield could achieve compensation effects, as long as the water stress duration and nitrogen fertilizer were reasonable combination. This shows that the method of controlling stress duration and nitrogen amount can produce higher soybean yield.