1. Temperature. The tomato growth temperature is 20 to 28°C during the day and 12 to 16°C at night. It is recommended that the vegetable farmer pull up the grass in the morning, and when the temperature exceeds 30°C, it will begin to release air. Below 20°C, it will shut off the air outlet and heat up.
2. Pest control. Low temperatures and high humidity in spring such as gray mold, etc., have been reduced, but the temperature is slightly higher, the humidity of less stringent diseases will be aggravated, such as leaf mildew, powdery mildew, root knot nematode disease. Then there are insect pests such as whitefly, aphids, and Liriomyza sativae. For these diseases and pests should be early prevention and treatment, leaf mold can be used 60% anti-mildew Bao (carbendazim hydrochloride) 500 times, 25% azoxystrobin suspension 800 times, 25% tebuconazole 2500 ~ 3000 times liquid, 25% zirconia oxazole 800 times and 2% kasugamycin 300 times spray control, pay attention to alternate medication, continuous 2 or 3 times.
3. Insulate the grass and keep warm. According to the insulation effect of the greenhouse, it is determined whether it will be time to put the grass in the morning or evening. The principle is to pull the temperature of the shed in the morning to 12 to 15°C. If the nighttime temperature exceeds 12°C, do not leave the grasshopper.
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