In spring, the greenhouse temperature is high and there are few insects, which is not conducive to pollination and pollination. It is easy to cause poor pollination of tomatoes, resulting in a decrease in fruit setting rate or poor fruit growth and development, and deformed fruits are formed. Therefore, greenhouse tomatoes need to be pollinated artificially in spring to improve yield and quality.
1. Reasons for poor tomato fruit setting
1. The plant grows severely. The temperature in the greenhouse is high, especially when the night temperature is high, the vegetative growth of tomato is too vigorous and the reproductive growth is insufficient, the stalk jointing is fast, the jointing is long, and it is not easy to set fruit. Partial application of nitrogen fertilizer can easily lead to improper nutrient supply and excessive plant growth.
2. High temperature affects flower bud differentiation. When the temperature in the shed reaches 35°C for more than 2 hours, the differentiation of tomato flower buds will be hindered, and the adhesion between pollen and stigma will be reduced, and the germination of pollen and the elongation of pollen tubes will be affected, making pollination and fertilization poor. , Thus appearing to be unable to sit still fruit 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 generally 12°C to 18°C ​​at night. Control the night temperature to prevent excessively high night temperature and stalk lengthening. The temperature is controlled within a proper range to avoid poor flower bud differentiation and affect the later flowering and fruit setting.
2. Reasonable fertilization. Mainly with nitrogen, phosphorus and potassium fertilizers, supplemented with phosphate and calcium fertilizers, the potassium requirement of tomatoes is about twice the nitrogen requirement. Increase in potassium fertilizer during the flowering and fruiting period and reduce nitrogen fertilizer can play a role in maintaining flowers and fruits.
3. Use Zuoguoling for spotting or spraying flowers correctly. In the case of high temperature, the concentration of the liquid medicine can be appropriately reduced to avoid the appearance of deformed fruits.
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