The cause of empty chaff of soybean

1. The difference of breed. The occurrence of middle and late maturity varieties was more serious, while that of early and middle maturity varieties was lighter. two。 Drought and waterlogging during childbearing period are the key factors leading to high grain rate. The best rainfall at the flowering and pod stage of soybean is 180 mm. In the flowering and pod stage of soybean, the harm of waterlogging is more serious than that of drought, especially in the disaster of waterlogging, the rate of empty grain and lodging are high. In addition, if the sowing time is dry, it will postpone sowing, delay the emergence of seedlings, reduce the accumulation of energy during soybean growth, and also cause empty chaff grains of soybean. In the later stage, if the low temperature affects the filling speed of soybean, it will also result in a higher rate of empty grain. 3. The lack of boron and molybdenum in soil is another main reason for the formation of high empty grain rate. Boron and molybdenum are essential trace elements for soybean development and are closely related to pod formation. If the content of boron and molybdenum in the tillage layer of the soil is low and there is no topdressing when planting soybean, it is bound to increase the empty grain rate of soybean. Especially for continuous cropping soybean, the rate of empty grain per plant increased year by year. At present, there are still some phenomena, such as shallow fertilization depth, planting fertilizer in the same bed, in the same position, and low fertilizer utilization efficiency, which affect the improvement of soybean yield.