Spring greenhouses have high temperatures and few insects, which are not conducive to pollination and pollination, and may cause poor tomato pollination, resulting in decreased fruit setting rate or poor fruit growth and development and malformation. Therefore, greenhouse tomato needs artificial pollination to increase yield and quality. First, the reasons for tomatoes to sit 1. The plants are very serious. High temperature in the greenhouse, especially when the night temperature is high, tomato nutrition growth is too prosperous and reproductive growth is insufficient, stems jointing fast, long jointing, not easy to set fruit. Partial application of nitrogen fertilizer is likely to result in improper nutrient supply and excessive plant growth. 2. High temperature affects flower bud differentiation. When the temperature in the greenhouse reaches 35°C and continues for more than 2 hours, the flower bud differentiation of tomatoes will be obstructed and the adhesion of pollen and stigma will be reduced. At the same time, pollen germination and pollen tube elongation will be affected, resulting in poor pollination and fertilization. , Which appears to sit still or produce a large number of deformed fruit. Second, the solution 1. Temperature management. The temperature in the shed should not exceed 30°C during the day and 12°C～18°C at night. Control the night temperature to prevent the nighttime temperature from being excessively long stems. The temperature is controlled within an appropriate range so as to avoid poor flower bud differentiation and affect the flowering fruit set in the later period. 2. Reasonable fertilization. Nitrogen, phosphorus and potassium fertilizers are mainly used to supplement phosphate fertilizers and calcium fertilizers. The potassium requirement of tomatoes is about 2 times the amount of nitrogen required. Potassium fertilizers and nitrogen fertilizers are reduced during the fruiting period, which may play a role in flower protection and fruit protection. 3. The correct use of fruit or spiritual spray flowers. In the case of high temperature, the concentration of the liquid can be properly reduced to avoid malformation. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone Low Light Level Device,Solid-State Detectors,Low-E Detector,Low Light Level Image Intensifier Shandong Freedoms Technology Co.,Ltd , https://www.sdfreedomtech.com