The latest key points for the management of soybean grain filling period

In soybean production, soybean seed swelling stage is an important stage, which has great influence on yield. At this time, soybean growth is in vigorous stage, seed gradually expands, and dry matter accumulation is the most. So how to manage the soybean swelling period? Let's get to know each other.

1. Fertilization outside roots

When soybean enters the seed swelling stage, vegetative growth basically stops, reproductive growth is in vigorous stage, at this time, a large number of nutrients in the plant are transported to the seed to promote seed expansion, which is the period of maximum dry matter accumulation. At this time, soybean has a large demand for phosphorus and potassium fertilizers. Before this, most of these nutrients move from the soil through roots, and the nutrient transformation in the soil is weak, which also leads to the imbalance between soybean's demand for nutrients and soil fertilizer supply capacity, which is easy to appear insufficient nutrition and premature aging, which becomes the main factor limiting soybean high yield. Therefore, the method of applying fertilizer outside roots can be adopted in the seed filling stage of soybean, which can effectively alleviate the contradiction between fertilizer demand and fertilizer supply, and accelerate the accumulation, transformation and transportation of assimilation products. 0.3~0.5 kg urea and 70~100 g potassium dihydrogen phosphate can be used for 30 kg water per mu. The foliar spraying has a good effect. It is appropriate to spray 2-3 times according to the growth situation.

2. Reasonable irrigation

In addition to nutrients, soybeans also need sufficient water when expanding, and the grain filling period is just after the peak rainfall period, so there is less rain, and the water in the soil is often insufficient, and there will be "autumn hanging" phenomenon. It has great influence on soybean expansion, so irrigation and water supply can be timely used to promote seed expansion and improve yield and quality.

3. Weeding

Weeding work should be strengthened during soybean seed swelling period. Weeds and soybean seed expansion compete for water and fertilizer, which will inhibit the reproductive growth of soybean. Therefore, weeding must be frequent. At this time, it is not suitable to spray pesticides, so as to avoid pesticides entering the seeds, which is harmful to human health. Therefore, it is recommended to manually remove weeds in the field.

4, pest control

This is also the high incidence period of soybean pod borers and pod borers. They will eat inside the pods, but they will continue to eat the seeds, eating the pods empty, causing yield to decline and spreading diseases. Therefore, it is necessary to strengthen pest control measures, and timely control of pests should be found.

The above is a summary of the key points of soybean seed filling management. I hope it can help you. If you want to know more about it, please pay attention to us.