Recently, some people have reported that some of the soybeans are not well-established this year. What are the reasons and how should they be prevented? The reasons and countermeasures for the bad soybeans are described below: Soybeans are multi-flower crops, and the seed-setting rate is closely related to the cultivation and management in addition to the varieties and natural conditions. In addition to causing irresistible natural factors such as falling out of flower or ridding of high temperature, it is mainly related to the following cultivation factors: 1. The density is too large, causing canopy closure. Due to different varieties and soil fertility levels, the planting density is different, the plant shape is larger, the growth habit is unlimited, and the water and fertilizer conditions of the plot are better. On the contrary, the plant shape is small, the growth habit is limited, and the water and fertilizer conditions are poor. Be more secretive. If the planting density is too large, the formation of canopy closure results in poor ventilation and light transmission in the middle and lower leaves, and it quickly turns yellow off. The nutrients provided for the normal growth of the calyx must be provided so that the calyx can not mature normally, or shedding or forming pods. Preventive measures: Before planting seeds, learn more about the characteristics of the varieties and their own soil strength, and scientific and reasonable dense planting. 2. Drought or stagnant water during the critical period of moisture. Soybean is a crop with a large amount of water. The flowering period is the critical period of soybean water requirement during the flowering period. During this period, the drought will seriously affect the reproductive growth of the plant and cause the calyx to fall off. Therefore, sufficient moisture should be maintained during the pod-filling period, and generally 70%-80% of the field capacity should be maintained. In the same way, poor drainage in the field can cause the accumulation of water to affect the normal growth of soybeans and cause the flowers to fall off or fall apart. Preventive measures: Choose land plots with good drainage and irrigation conditions, and water them timely when drought occurs. Pay attention to listening to the weather forecast when you are pouring, and try not to make it rainy or heavy in the 24 hours after pouring. After the rain caused the accumulation of water in the field, it must be promptly removed. 3. Nutrition deficiency. The lack of any nutrient elements during the growth of soybeans will affect the normal growth of the plant, affecting fruitfulness and affecting yield. Preventive measures: Apply enough basal fertilizer to adopt foliar spraying of potassium dihydrogen phosphate, zinc sulfate, borax, urea and other aqueous solutions during late soybean growth to prevent late-stage fertilizer loss. 4. Variety reasons. Early and mid-maturing varieties of this year are generally better flowered and pod-bearing, while some of late-maturing varieties are sown with late soybeans. This is because during the flowering period of soybeans, it is experiencing continuous high-temperature and dry weather in June and July, and the temperature is as high as 35-40°C. The suitable flowering temperature for soybeans is 22-30°C. At the same time, soybeans are short-day crops. If the requirements for short-day sunshine within 25 days after sowing are not satisfied, flower bud differentiation will also stop. In addition, the prevention and treatment of pests and diseases will not result in good soybeans.