Generally, how many days before soybean harvest is very important, and lack of water will reduce production.

All soybean growers know that August is the most prone to water shortage and drought, and this period is also the key period for the formation of soybean yield.

Soybean is usually planted in the middle and late May of each year. Before sowing, soil moisture is usually sorted out, so the influence of early moisture on soybean growth is very small. From the beginning of branching to the flowering stage, the demand for water for soybean growth will gradually increase to, and the demand for water will reach a peak in July and August when soybeans begin to pod and bulge, which will greatly increase.

Pod setting and grain filling stage is an important period for soybean seed formation. Whether soybean grows normally at this time will determine the number of seeds per inch, the weight of seeds and the chemical composition of seeds. At this time, drought or rainy waterlogging can cause death, seed shrinkage and grain weight decline, which seriously affects the yield.

According to statistics, in the pod setting and grain filling stage, the water required by soybean accounts for about 50% of the water required in the whole soybean growth process. Generally speaking, this period is also the period with the highest temperature in China, and the transpiration intensity reaches its peak during this period, and the dry matter also rises linearly. Therefore, droughts often occur during this period. If the water supply is not timely, it will often lead to less pods in soybeans. The decrease of soybean seeds on pods and the light weight of soybeans (in short, there are many shriveled seeds and shriveled pods) have a great influence on soybean production-and in our futures investment market, the annual weather speculation basically starts from this time and lasts until the soybean harvest period.

Of course, it should be noted that when the leaves begin to show signs of yellowing after the pod filling stage is completed, it is necessary to control soil moisture to accelerate the grain maturity at this stage and prevent late ripening, which is also not conducive to coping with possible freezing weather.