Greenhouse tomatoes are prone to premature senescence if they are not properly managed in the middle and late stages of growth, showing the dry edges and roll-up of the lower leaves, yellow-green flowers and leaves in the middle and upper leaves, cracking and deformed fruits, which seriously affect the yield of tomatoes. To prevent the premature aging of tomatoes in greenhouses and increase the yield in the middle and late stages, the following measures can be taken.
One is to control the temperature. Especially at noon if the temperature exceeds 33 ° C for too long, the plants are prone to distortion of growth points and the middle and lower leaves curl. Special attention should be paid to the temperature during the fruit expansion or fruiting period, and the temperature should be strictly controlled and shaded appropriately.
The second is to water evenly. High temperature and drought will cause premature senescence of tomatoes. Therefore, under high temperature conditions, it is necessary to increase the number of waterings and reduce the amount of watering (gutter or border watering) to ensure the demand for water during the fruit expansion period.
The third is to supplement nutrients in a timely manner. Nutrient supplementation is not easy to produce cracked fruit and deformed fruit in time. When the temperature is high and the number of watering times is increased, the ternary compound fertilizer should be properly applied and a certain amount of trace elements should be appropriately applied.
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