1. Select sowing time: sowing in batches from early February to late April, sowing can be used for seeding or sowing method or transplanting, dry seeds can be directly seeded, soaked in fresh water for 2 hours, and germination for 24 hours before sowing. Before the end of March sowing should use late-maturing varieties, such as slow in April, dwarf resistance, dwarf yellow and so on. After the planting in late March, precocious and mid-maturing varieties such as tall white and dwarf white were selected. 1.2-1.5 kilograms per acre seedlings can be planted 3-4 acres of field. 2. Selecting land for planting: Select no-three-waste pollution, loose and fertile soil with no excessive standard pesticide residues and toxic heavy metals, and sunny, high-drying, and cool water fields. Use narrow-necked deep trenches for cultivation, with a width of 1.5 meters, and require smooth surface. Duo Shi Chen Fu ash and soil miscellaneous fertilizers to improve water. 3, sowing and planting: spring cabbage more than seedlings listed, part of the planting or stay "sit down" tender plant listed, after sowing with 40-50% of decomposed human livestock fecal "cover foot", after depending on the weather and the surface of the wet and dry conditions decided to pour water. When planting seedlings, seedling age 15-25 days, spacing 16 cm, spacing 6-10 cm. More intercropping with melons and beans. 4, cultivating topdressing: After planting, can directly use 20-30% concentration of cooked manure water "pressure rake." After survival, apply manure once every 3-4 days. In the sunny morning, the frequency of topdressing should be diligent, the concentration should be small, and the soil should be wet after rain. The frequency of topdressing should be reduced, and the concentration can be appropriately increased. Live seedlings listed, just after the emergence of the election, sunny topdressing 1-2 times 20-30% cooked manure. More than 7 days prior to harvest, stop the application of manure water, change the water or apply a small amount of urea or ammonium bicarbonate. It is rainy in spring and the soil is easy to build up. Drainage should be cleared in time to prevent accumulation of water. The number of waterings during the growth period of the Chinese cabbage, as the plants grow, the outside temperature rises, and the evaporation increases. It should be gradually increased to keep the soil moist. 5. Cultivation of greenhouses: Spring cabbage can be used to make melons and legumes in greenhouses. It can be used for insulation and avoiding frost or cold, shortening the growth period, and mentioning the morning market.
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Non-pollution Cultivation Techniques of Spring Chinese Cabbage
Spring Chinese cabbage is spring cabbage, which can be produced in small and medium arch sheds or in open fields, and listed as seedlings or tender plants. The short growing time and easy cultivation are the main vegetables to solve the spring, but it is difficult to avoid the influence of low temperature during the seedling cultivation and after planting. When the weather is warm, it is easy to convulsion, affect the quality, reduce the yield, and the pests and diseases also follow. The increase in its pollution-free cultivation should pay attention to the following points.