In May, when the temperature is too high, premature management of the tomatoes in greenhouses is prone to premature aging, showing the dry and rolling leaves of the lower leaves. The leaves of the upper and middle leaves are yellow and green, and there are fruit cracks and deformed fruits, which seriously affect the yield of tomatoes. To increase the yield of greenhouse tomato middle and late period, there are mainly the following measures:
The first is to control the temperature difference between day and night. Especially at noon, if the temperature exceeds 33°C for a long time, the plants tend to be distorted with growth points, and the middle and lower leaves curl. Special attention must be paid to the strict control of temperature during fruit expansion or full fruit period.
The second is to water evenly. High temperature and drought will cause premature senescence of crops. Therefore, in high temperature conditions, the number of watering should be appropriately increased to reduce the amount of watering (guttering or guttering) in order to ensure the demand for water during fruit enlargement;
Third, nutrient supplements should be timely. Nutrient supplementation is not easy to produce cracked fruit and malformed fruit. In the case of high temperature and increased frequency of watering, appropriate nitrogen, phosphorus, and potassium ternary compound fertilizers should be topdressed, and a certain amount of trace elements should be selected.
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