1. The selection of soybean varieties is irrational and it is not suitable for the local climate and environmental conditions. 2. The sowing time of soybean is too early and the vegetative growth period of the plant is too long, which leads to the physiological age of the soybean flowering is too old and it is difficult to scab. Sowing of summer soybeans, suitable for early maturing varieties suitable sowing date is June 10 to 20, the latest can not exceed July 20, medium-maturing varieties for June 15 to 30, late-maturing varieties suitable sowing date for late June to 7 At the beginning of the month, the date of sowing of young soybeans can be delayed for a certain period of time. Should be based on the mouth, use suitable varieties. If sowing is too early, such as early maturing varieties before June 10, sowing of late varieties will appear before the June 20 flowering phenomenon. 3. High temperature and drought caused the soybeans to fail to be fertilized normally, and the young can not develop. If soybeans hit a hot, dry weather during the flowering and fruiting period, the soybeans will not bloom or spend less, or spend less. The suitable temperature for soybean growth in seedlings is about 20°C, the optimum temperature for flower bud differentiation is 20～25°C, the optimum temperature for flowering is 25～28°C, and the suitable temperature is 20～22°C for the pod stage, and the temperature is too high. Falling out of flower is serious, but when it is too low, maturity is delayed. Soybeans are also not resistant to high temperatures. Temperatures in excess of 33-35°C can seriously affect the rate of cockroaches. High temperature and drought cause the soybeans to fail to be fertilized normally, and the young can not develop. The suitable temperature for soybean flowering is 25-28°C and the suitable relative humidity is 70%-90%. If the temperature is maintained at 33°C for a long time, the soybean pollen grains will dry up, causing poor pollination and fertilization. If soybeans hit a hot, dry weather during the flowering and fruiting period, the soybeans will not bloom or spend less, or spend less. The continuous hot weather in July-August this year will have a great impact on the flowering and podging of soybeans. Continuous hot weather may be the main reason for this year's large-scale emergence of soybeans without blooming. Precaution The first is timely sowing. Summer soybeans have high requirements for short days, sowing too early will lead to early flowering, and will also cause old seedlings and mad long seedlings. The second is a reasonable rotation. Soybean rhizobia will release large amounts of organic acids after rot. These organic acids will inhibit the growth and development of soybean roots and aboveground parts. Soybeans should be planted for 1 year after planting non-bean crops for 2 years. The third is balanced fertilization. Soybean field is best to apply 50% of farmyard manure, appropriate application of molybdenum fertilizer and boron fertilizer. The fourth is dense planting. The number of plots with high fertility is controlled at 10,000 per acre, and that of medium fertility is controlled at 1.3-1.5 million per acre. The fifth is to support the field trench system so that irrigation can be performed. Soybeans are the crops with more water requirements. The flowering and podling period is the critical period of water requirement for soybeans. At this time, soil drought has a great influence on the yield and quality of soybeans. If there is no rain for 1 week in the summer, it should be timely watered. The drought in the flowering stage has a great influence on the number of grains in soybeans. It must be watered in time, and drainage should be paid attention to in the rainy days. Protection measures should be determined according to the growth and appearance of the plants. Strong and prosperous control is prosperous. If the plants are weak, fertilization should be combined with cultivating and watering. It is best to apply compound fertilizer at a rate of 5 to 10 kilograms per mu. Dried Garlic Powder,Dried Minced Garlic To Garlic Powder,Garlic Dry Powder,Sun Dried Garlic Powder shandong changrong international trade co.,ltd. , https://www.cragriculture.com