In the winter and spring season, small sheds are used to cultivate leeks, which can be harvested in 50 days. The open cultivation is listed 30 to 50 days in advance, which results in low investment and high efficiency. The main points of its cultivation techniques are described below:
Variety selection. Should choose strong adaptability, early maturing, cold-resistant, drought-tolerant, pest-resistant varieties. Such as green stem large leaf leek and Thailand silk worms.
Fine soil preparation, sufficient base fertilizer. It should be selected for the cultivation of lands in Yangyang lee, with soils rich in organic matter and water conservation and fertility as well. Planting areas should be sun-dried white, shallow plough fine smashing, smashing smashing, smashing width of 1.2 meters, ditch width of 0.4 meters, in order to take a small arch shed, covering 2 meters wide film. Each mu of fully cooked chicken manure 1500 to 2000 kilograms, superphosphate 100 kilograms, mixed with the soil leveling, surface soil particles should be small uniform, in order to facilitate seed germination and growth.
Soak germination. The winter and spring temperatures are low. Seeds should be sterilized with hot water at 50-55°C before sowing, soaked for 24 hours after natural cooling, and germinated at a temperature of about 30°C until the seeds are whitened.
Sowing coverage. In winter and spring, the leeks cultivated in the spring are often marketed as a commercial dish. The output of the leeks is also considered as the number of plants in addition to the weight of individual plants. In general, 15-20 kg per acre is used to spread the newly sprouted seeds on the surface of the pods, then cover them with rakes, then cover with straw and then drench. Small plastic sheds covered with plastic film, under normal circumstances to cover the whole growth period.
Temperature management. Chives are not tolerant to low temperature and frost. Therefore, in the whole growth period, cultivation and management are mainly based on warming and heat preservation and freezing, and it is better to maintain the temperature of the greenhouse above 15°C before emergence to facilitate early emergence and strong seedlings. When the temperature of the greenhouse rises with the increase of the ambient temperature, the temperature of the greenhouse should not be controlled to exceed 35°C. When the temperature increases, the amount of ventilation increases. The greater the temperature difference between inside and outside the small arch, the more attention should be paid to ventilation and ventilation. Never abruptly ventilate the air so that the cold and warm air can be exchanged abruptly, so as to avoid a large number of water loss in the plants, wilting of the leaves, dryness of the leaf margins, and affecting the commodity value of the plants. When the temperature is lower than 15°C in low temperature and rainy weather or at night, the ventilation is not suitable, and the insulation of the greenhouse film is still mainly closed.
Fertilizer management. The leaf tip of leeks grows quickly and has a large amount, so it needs a large amount of fertilizer and strong fertility, especially for the requirements of nitrogen fertilizer and potassium fertilizer. Therefore, nitrogen fertilizer, potash fertilizer, and foliar fertilizer should be the main fertilizers. After the emergence of low temperature, fertilizer and water should not be too thick; in the beginning of harvesting 3 to 6 times before the harvest, and watering, in order to maintain high air humidity and moist soil as the standard. With the growth of leeks and the increase of outside temperature, the amount of water and fertilizer should be gradually increased.
Pest Control. The pests of leeks mainly include small ground tigers, diamondback moths, and leaf-worms, and they can be controlled by insecticides, insect pests, and insecticides. Diseases mainly include damping-off, stalk rot, and white rust. They can be controlled by agricultural chain toxins, zein-zinc, and virgin mycotoxins.
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