How to prevent the shedding of soybean flowers and pods when planting soybean

First, topdressing because of the land and the seedlings. The field in which the plant can not be closed in time due to lack of fertilizer at flowering stage can be fertilized again at the early flowering stage. Generally, 5 kg urea or 10 kg ammonium sulfate per mu can reduce the shedding of flowers and pods.

Second, spraying fertilizer outside the root. In flowering and pod stage, urea 0.5 kg, superphosphate 1.5 kg, potassium sulfate 0.25 kg, borax 25 g, water 50 kg extract solution per mu were sprayed on leaves, which was suitable for spraying on cloudy days or after 4: 00 p. M., which is beneficial to flower protection, pod and grain increase, reduce shrunken grain and increase grain weight. Spraying fertilizer outside the root can be combined with disease prevention and pest control to improve labor efficiency.

Third, chemical regulation. The use of paclobutrazol in soybean has the function of strengthening plant, increasing branch, shaping ideal plant type and increasing yield. In high-yield fields, 15% paclobutrazol was sprayed with 20 grams of paclobutrazol and 50 kilograms of water at the early flowering stage. It can improve the plant type of soybean, prolong the functional period of leaves, improve the ventilation and light transmission conditions in the field, and optimize the growth environment of soybean, so as to promote growth and reduce shedding.

Fourth, pay attention to drought prevention and drainage. From flowering stage to podding stage, soybean absorbs the fastest water and consumes the most water in its lifetime. If the absolute water content of the soil is less than 25% during this period, it should be irrigated. Generally every 5-7 days irrigation, continuous irrigation 2-3 times, do not flood irrigation. Soybean is also a crop with poor waterlogging tolerance, and it is also easy to cause flowers and pods after flooding, so we should pay attention to waterlogging to prevent waterlogging damage.

Fifth, strengthen the prevention and control of diseases and insect pests. Virus diseases can be sprayed with 250x solution of 5% Shiduqing at the initial stage of the disease; purple spot disease can be sprayed with 50% benzoate or Dysen zinc 800x solution after flowering; and aboveground pests of soybean can be controlled with 1.8% avermectin 3000 times solution.