With the gradual rise of temperature in spring, tomato plants began to grow normally, but it still needs a period of recovery. This period of time is different from winter management. It is necessary to master the following points.
First, the temperature. The temperature rise is beneficial to the growth of vegetables, but the higher the better, the temperature should be adjusted according to the habits of the vegetables being grown. Tomatoes are vegetables that are warm and light. The temperature is preferably 20 ° C-28 ° C during the day and 12 ° C-16 ° C at night. In production, some vegetable farmers have very poor temperature management, and the greenhouse temperature does not let the wind exceed 32 ° C, which is not good for the growth of tomatoes. It is recommended that vegetable farmers start to release air when the grass gardenia is pulled up in the morning, and close the air outlet to raise the temperature when the temperature exceeds 30 ° C.
Second, pest control. Low temperature and high humidity diseases such as gray mold in spring should be alleviated, but diseases with slightly higher temperatures and less stringent humidity requirements will be aggravated, such as leaf mold, powdery mildew, and root-knot nematode disease. Then there are insect pests, such as whitefly, aphids, Liriomyza sativa, and so on. Early prevention and treatment of these diseases and insect pests should be achieved. Leaf mold can be treated with 500% of 60% of antifungal (carbendazim hydrochloride), 800 times of 25% azoxystrobin suspension, and 25% of tebuconazole 2500. -3000 times solution, 800% solution of 25% oxamidox and 300 times solution of 2% kasugamycin. Pay attention to alternate medication, 2-3 times in a row. Powdery mildew can be prevented by spraying 10% anisole and triconazole microemulsion 2,000 times, 50% fenoxystrobin dry suspension 3000 times, and 30% Teflon (fluconazole) 2000 times. Root-knot nematode disease is blessed with 750 grams per mu, mixed with a small amount of fine soil and scattered around the plants, and then watered; or 1.8% Ainuo 3 is applied with water, 1 kg per mu, and the validity period is 2 months.
Third, put grass dumplings to keep warm. Temperature management is important, but science should not be copied. It is found in production that many people place grass dumplings to watch time or learn from each other, regardless of the conditions of their greenhouses and types of vegetables. The reason is that the shed shape is different, the lighting and heat preservation are different, and the high temperature vegetables and the high temperature vegetables are not the same, so the grass dumplings should be different. The scientific method is to determine the morning and evening time of putting grass ladle according to the insulation effect of the greenhouse. The principle is that the grass ladle is pulled up in the morning and the temperature is 12 ° C-15 ° C. If the night temperature exceeds 12 ° C, weeds will not be placed.
Fourth, hormones. As the temperature rises, the concentration of hormones used is different from winter. Recently, vegetable farmers have consulted them more, for example, some leaves are deformed stiff and even become linear, and some fruits are deformed and hollow. These are the cases where hormones are still used in winter, and the concentration and dosage are the same. The correct method is to add water to dilute the water on the basis of the original concentration, high temperature and low concentration. Only in this way will the deformed fruit be reduced and the benefit will not be reduced.
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