In the middle and late stages of tomato growth in greenhouses, if it is improperly managed, it will be prone to premature aging. It will show the dry and bulging leaves of the lower leaves. The middle and upper leaves will form yellow and green mosaics, which will cause fruit cracking and malformation, which will seriously affect tomato yield. To prevent the premature decline of tomato in greenhouses and increase the yield in the middle and later stages, the following measures can be taken.
The first is to control the temperature. Especially at noon, if the temperature exceeds 33°C for a long time, the plants are prone to distortion of the growth point and the middle and lower leaves are curled. Special attention must be paid to the strict control of temperature and proper shading during fruit enlargement or full fruit period.
The second is to water evenly. High temperature and drought will cause premature tomato decay. Therefore, it is necessary to increase the frequency of watering and reduce the amount of watering (guttering or guttering) during high temperature conditions to ensure the water requirement for fruit expansion.
Third, nutrient supplements should be timely. Nutrient supplementation is not easy to produce cracking fruit and malformed fruit. In the case of high temperature and increased frequency of watering, it is necessary to topically apply three-component compound fertilizer and apply a certain amount of trace elements.
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