As the temperature gradually rises, the tomato plants begin to gradually enter normal growth, but still need a period of recovery, management must master the following points.
temperature. Temperature rise is good for vegetable growth, but the higher the better, the temperature should be adjusted according to the habits of the vegetables. Tomatoes are warm and light vegetables. The temperature is 20-28 ° C during the day and 12-16 ° C at night. Recently, when I went to the countryside, I found that some farmers had temperature management that was not in place. The temperature of the shed exceeded 32 °C and did not release the wind, which was not good for the growth of tomatoes. It is recommended that the vegetable grower, after the grass hazelnuts are pulled up in the morning, the temperature starts to ventilate when the temperature exceeds 30 °C, and then the temperature of the air outlet is closed when the temperature is lower than 20 °C. Look at the day management, you may release the wind several times a day, or you may only put it once.
Pest Control. Spring low-temperature and high-humidity diseases such as gray mold disease should be reduced, but the temperature is slightly higher, and the diseases with less stringent humidity requirements will be aggravated, such as leaf mold, powdery mildew and root knot nematode disease. Then there are pests, such as whitefly, aphids, and Liriomyza sativae. For these pests and diseases, early prevention and early treatment should be achieved. For leaf mold, 60% anti-mildew (carbendazim hydrochloride) 500 times solution, 25% azoxystrobin suspension 800 times solution, 25% tebuconazole 2500 can be used. - 3000 times solution, 25% azoxystrobin 800 times solution and 2% spring erodemycin 300 times solution spray control, pay attention to alternate medication, 2-3 times in succession. Powdery mildew can be sprayed with the following agents, 10% difenoconazole microemulsion 2000 times solution, 50% ether oxystrox dry suspension 3000 times solution, 30% terfenprozil (fluoxazole) 2000 times solution, continuous 1- 2 times. Root knot nematode disease is more than 750 grams per acre, mixed with a small amount of fine soil around the plant, and then watered; or 1.8% of Aino No. 3 with water, 1 kg per mu, valid for 2 months. Insect pests can be trapped by yellow plates, economical, safe and effective. 50 pieces per acre can be added, and sexual attractants can also be added. These insecticide methods are the best method for greenhouse early spring.
Put the grass to keep warm. Temperature management is important, but science should not be copied. The shape of the shed is different. The lighting and heat preservation are different. The high-temperature vegetables and the warm vegetables are not the same, so it is not the same to put the grass. The scientific method is to determine the time of putting the grass in the morning and evening according to the insulation effect of the greenhouse. The principle is that the grass scorpion is pulled up in the morning and the temperature is 12-15 °C. If the nighttime temperature exceeds 12 °C, you can not put the grass.
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