Spring cabbage generally sown in February-March, May-May should be the city, about 4,000 kilograms per mu, is a very good economic benefits of an off-season vegetable cultivation. However, the spring climate is characterized by low temperature in the early stage and high temperature in the late stage, which is contrary to the growth habits of Chinese cabbage. The key to successful cultivation of spring cabbage and high yield is to select the appropriate variety, sowing date and cultivation methods, to prevent the low temperature at the seedling stage leading to immature early-mosquito, and to prevent the shoots from budding after necrosis on the top of the seedlings. Select suitable sowing date and cultivation method. Chinese cabbage seeds are vernalized crops. Seedlings pass vernalization at 10 to 15 days at 2 to 10°C and vernalization at 10 to 15°C. Therefore, choosing the appropriate sowing date and cultivation to ensure the seedling temperature higher than 13°C is the key to avoiding early moss and obtaining high yield. The use of greenhouses and small sheds in the Yangtze River valley and mulching can be planted at the beginning of February. Small sheds and mulching film will be transplanted in early March; mulching and mulching in greenhouses will be conducted from mid-February to early March, and mulching from mid-March to early April. In the middle and late March, small arch shelters can be used to raise seedlings, and in the middle and late April, the field is transplanted. The selection of suitable varieties generally requires the selection of winter strong, glu- cockroach-resistant, and good-quality varieties. For example, Spring Nongnong, Spring General, and Chunqiang are all very good varieties of spring cabbage. Fine soil preparation, fertilizer application. Spring Chinese cabbage has a short growth period, shallow root distribution, and more fertilizer. It requires the selection of deep and fertile sandy soil, and the Chinese cabbage is not resistant to heavy crops, and it is best to rotate with solanaceous fruit crops. Ploughing 2-3 times before planting, so that the field flat ground, before the last ploughing per 667 square meters apply 3,000 kg of manure and 30 kg of compound fertilizer. The Yangtze River basin generally consists of 1 meter of ditch, 0.4 meter of ditch, 0.3 meter of ditch, 2 rows per plant, 0.4 meter spacing, and 3,500 plantings per 667 square meters. Seedling management can use direct seeding or nutrition seedlings can be planted at the end of a foot water, to avoid frequent replenishment to reduce greenhouse temperature or cause disease; cotyledons to maintain proper high temperature before unearthing, up to 25-28 °C; cotyledons unearthed after the emergence of true and false leaves , appropriate to reduce the temperature of the greenhouse, keep 18-20 °C can be. To prevent tall seedlings; proper increase in greenhouse temperature after the emergence of true leaves, maintain 20-25 °C, and promote long seedlings. During the nursery period, special attention should be paid to prevent the night temperature from falling below 13°C, and the cold weather should be covered with grasshoppers to keep warm. Real leaves 6-8 pieces, seedling age 30-35 days can be transplanted. During the nursery period or after the planting of the field, the top bud necrosis due to high temperature and high humidity should be prevented, or the long-term excessive drought on the seedbed may cause the terminal buds to fail to grow normally and cause lateral bud clusters. Live seedling seedlings 2 times, the first time in the cross, about 10 days after sowing; the second in the 4-5 true leaf period, that is, complete the first leaf ring. After field planting, every 667 square meters of land is planted with thin human urine plus 5 kg of urea; rosin water from the rosette stage to the ball stage, 20 to 25 kg of urea for 667 square meters, and 10 to 15 kg for compound fertilizer, divided into 2— 3 times combined with seedlings, the water management kept dry and wet, generally pouring water once every 7 days. Diseases are mainly caused by the prevention and control of the three major diseases. Insect pests are mainly locusts, cabbage caterpillars, and diamondback moths. They use high-efficiency and low-toxic counterparts to prevent and control pesticides, and they also pay attention to comprehensive agricultural control and fitness cultivation. The sooner the early harvest of spring cabbage is harvested, the greater the risk of bolting. Care should be taken to observe the elongation of the shortened stem. Harvest it as soon as possible before bolting or light bolting but without affecting food quality.
The bearing structure, fixed film systems and installation of this greenhouse is relatively simple. And due to it, raw material and manufacturing costs are affordable. Except the high strength woven film is higher, other kinds of antidrop film are economical. In general, the comprehensive cost of film greenhouse is lower 30% ~ 50% than the same size and specifications of the other types of greenhouse.
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