The lower temperature in early spring, the cultivation of vegetable greenhouses is the key. Soybeans, melons and vegetables should be a good "seven off." Seed Disinfection Off: Use hot water of 55°C~60°C for 15 minutes to kill pathogens attached to the seed surface and some of the seeds that are lurking inside the seeds. Disinfection, use a thermometer to insert water, strictly control, constantly adjust, stabilize the temperature, ensure the time. Seed Germination Off: Disinfect for 15 minutes and soak in warm water below 30°C for about 8 hours, then clean it again and put it in gauze bag, and then put it into a wide plastic bag, germinate at 25°C~30°C and turn regularly. , Clean the next day, ensure the temperature, ensure that the germination is neat. Disinfection of bed soil: bed soil is not sterilized, and there are many diseases at the seedling stage. Solanaceous vegetables can be mixed with 70% pentachloronitrobenzene and 50% thiram or mancozeb, etc., with a mixture of 8 to 9 grams per square meter, mixed with 15 kilograms of semi-dried fine soil, and sowed 1 /3 to do pad soil, 2/3 do cover soil. Melon with 50% carbendazim or thiophanate-methyl 1 part, 1000 dry fine soil, dubbed medicine soil, spread 10 kg per square meter, method ibid. Temperature off: The temperature is 25°C~30°C and the ground temperature is 22°C~25°C. The seedling emergence is fast and homogeneous. In general, if the seeds are unable to germinate under low temperature and high humidity conditions for a long time, they can be easily rotted. After the vegetable seedlings are flushed, the temperature in the greenhouse is kept above 20°C during the day and above 10°C in the evening. The seedlings are subjected to a low-temperature hardening seedling to enhance disease resistance, cold resistance and avoid long growth. When the outside temperature is no higher than 15°C at noon noon, ventilation can be made through the window and the sun shines. At night, the outside temperature is lower than 4°C to cover the straw curtain. Humidity: humidity is too high, the soil temperature is not easy to rise, poor growth of seedlings becomes weak seedlings, prone to disease or frost damage; humidity is too low, lack of water due to fertility become stiff seedlings. Low humidity can be solved by watering, and high humidity is more troublesome. If the treatment is not good, damping-off and blighting occur one after another, which can cause large dead seedlings. Ventilation and dehumidification can be performed without affecting the temperature of the shelf. Full water when sowing, avoid watering at seedling stage. Spreading 0.5 to 1 cm thick grass ash on the bed can also increase the temperature. A parallel light bulb is placed under a small shed to dampen and fill light. The electric wire is laid on the bed before sowing. Fertilization Guan: When cultivating strong seedlings, formula fertilization should be adopted when preparing bed soil, and basal fertilizer should be applied once at a time so that the seedling period will not be top-dressed. If the bed soil is not fertile, small yellow leaves of the vegetable stems and stems should be topdressed. But should pay attention to: Select the sunny day morning topdressing human fecal urine, pig manure, diluted with 20 times the water before topdressing, and finally rinse with water to prevent burning leaves. As far as possible without chemical fertilizer, if the concentration is low, urea 0.1% is appropriate. Disease related to the disease: timely prevention and treatment of the disease. Solanaceous fruit damping-off disease can choose to use quintoxe or anti-virus quinone, melon plague disease can choose to use chlorothalonil or anti-virus quinones; blight can choose to use dexamethasone or methyl quicterine, both diseases occur simultaneously Preclosure or Formosa can be used. If none of the above two drugs can choose chlorothalonil or anti-virus drugs. For the prevention of Bacillus subtilis, Brown Vegetation, and Botrytis cinerea should also be prevented from the seedling stage. Chlorothalonil, antiviral bacillus and sulfasulfuron should be selected. According to the situation, it is possible to flexibly master comprehensive prevention and control.
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