After the tomato grows and develops into the fruiting period of flowering, a large number of flower and fruit shedding often occurs, which seriously affects the increase of tomato yield. What are the reasons for falling tomatoes? One, low temperature, rain and sunshine. Most appear in the spring, the optimum temperature for the tomato flowering period is 25-28 °C, when the temperature drops below 15 °C, pollen germination is poor, dropped to below 10 °C, the pollen can not germinate and grow, resulting in poor fertilization, flower body Lack of growth hormone and a large number of flowers. At the same time, there is a lack of sunshine at low temperatures and overcast rain, and sometimes there is a long period of sunshine. Organic matter cannot be produced through normal photosynthesis, and flower development is not good. On the other hand, when the temperature is low and the weather is cloudy, the air humidity is high, and the pollen grains bulge excessively and break, losing pollination ability and falling. Second, high temperature and drought. Occurred in summer and autumn. During the fruiting period of tomato flowering, water is particularly needed, and the soil is too dry, especially if it is wet and dry or the plant loses too much water in a short period of time, the growth is poor, and the pollen loses water and infertility causes flowering and fruit drop. On the other hand, the soil is not dry but the air is dry and hot. For example, when the relative humidity of the air is below 10%, the stigma and pollen of the flowers will shrink and shrink quickly. The pollen cannot grow on the stigma and fall. In summer and autumn, there will be hot weather, sometimes the temperature at noon is as high as 35-40°C or even more than 40°C, causing high temperature burns, pollen abortion, and flowers shrinking and falling. Third, plant growth malnutrition. After the tomato enters the flower and fruit stage, the demand for various nutrients such as flowering, bud formation, fruit setting and fruit growth and development reaches a peak period. If there is insufficient supply of nutrients at this time, there will be a drop in fruit. Malnutrition can also affect the normal development of flower organs and fruits. If pollen is small and the style is uneven, it cannot be normally pollinated and fall off. To prevent tomatoes from falling, we must do a good job in the following points: 1. We must nurture and transplant strong seedlings to enhance the plant's resistance to stress. 2. Scientifically regulate the temperature and humidity conditions of tomato growing environment. Anti-low temperature in spring, anti-high temperature or drought in summer and autumn, timely irrigation and drainage, keep the ground dry, high temperature when the spray mist spray to protect the flowers and protect the fruit. 3, timely and rational fertilization after the flower and fruit period to ensure a balanced supply of various nutrients. It is better to use foliar spray fertilizer, such as spraying 0.2%-0.3% potassium dihydrogen phosphate during fruit setting. 4, timely chemical regulation. The currently more effective agents are tomato spirits and 2.4-d. The use concentration of Tomato Spirit is 20-40ppm, general spraying, dipping flower use 25-30ppm, 30-35ppm of peduncle flower, 35-40ppm of low temperature and falling flower in spring, and 25ppm of high temperature falling flower in summer. 2.4-d use the concentration of 10-20ppm, high temperature season or dip flower or spray concentration slightly lower, on the contrary slightly higher, but to prevent the emergence of phytotoxicity.
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