The defoliation rate of soybean is also the maturity rate. The reason for the defoliation rate is that some soybean diseases (such as soybean-induced diseases) will only affect the yield before the soybean matures, but if the soybean has entered the mature stage, such diseases will not have a great impact on the soybean yield. These are all smoke bombs released by the long and short forces in the futures market, and they are also a strategy.