Planting techniques are as follows:
1. land beds:
Soil deep plowing and sunshine white, applying sufficient fertilizer. Basal fertilizer is generally per 667 square meters of rotting organic fertilizer 1000 ~ 1500 kg, potassium chloride 5 ~ 10 kg; or chicken manure 750 kg, 20 kg of compound fertilizer. The width of the bed is generally 1.6 to 1.7 meters, 20 to 30 centimeters high, in the shape of a turtle's back.
2. Timely sowing:
Early-maturing varieties suitable for cultivation from April to August, medium-maturing varieties suitable for cultivation from September to October, late-maturing varieties suitable for cultivation from November to March.
Early and mid-maturity varieties to direct seeding; late maturing varieties to transplanting. Early and mid-maturity varieties should not be sown late, otherwise it will lead to rapid buds and shoots, small heart, low yield, or even failure. Late-maturing varieties should not be sown early, otherwise it will lead to late shoots, the quality of vegetable shoots is not good. Winter or spring should be sown when the cold wave will end, summer and fall should be avoided in the rainy, stormy and typhoon weather sowing. Direct seeding mu seed amount of about 150 ~ 180 grams. Seedling mu use about 400 to 500 grams of seed.
Before sowing, spray copper amine solution (100 grams of copper sulfate plus 550 grams of ammonium carbonate mixed with 200 grams of water) mixed with topsoil and closed for 24 hours for soil disinfection.
Cabbage heart seed germination of the appropriate temperature of 24 ℃ to 26 ℃, at this temperature, 4 to 6 days to all seedlings; seed germination if encountered lower temperatures (3 ℃ to 15 ℃) will be able to pass through the vernalization stage, so the winter and spring sowing should be selected with late-maturing varieties, and to do a good job of cold work in order to prevent the early shoots. Early spring sowing, it is appropriate to choose sunny, organic matter more high dry land for seedbed land, and choose sunny and warm weather or the end of the cold wave sowing; summer and fall high temperature and rainy season sowing, should be covered with shade nets or straw, in order to shade the sun and cool down the temperature, and can avoid heavy rains scouring, resulting in seedbed sloughing.
3. Field management:
1)Inter-seedling seeding: direct seeding in the beginning of cotyledons will begin to inter-seedling, inter-seedling 1 ~ 2 times; transplanted cabbage in the seedling 3 leaves combined with the replenishment of seedlings for inter-seedling seeding. Seedling spacing is generally 10 × 13 cm for early maturing varieties, 17 × 20 cm for medium maturing varieties, 20 × 23 cm for late maturing varieties.
2) reasonable fertilization: it is appropriate to apply diligently, early application, thin application, fertilizer is appropriate to use fast-acting complete fertilizer. Vegetable heart in the first true leaves unfolding timely fertilizer, per 667 square meters of dilute manure or urea 3 ~ 4 kg, 3 true leaves when combined with the inter-seedling chasing a fertilizer. After that, every 5 to 7 days can be 667 square meters with urea 5 to 10 kg and compound fertilizer 10 to 20 kg mixed. When the buds are applying heavy fertilizer, every 667 square meters of compound fertilizer 15 to 25 kilograms. After harvesting the main shoots continue to harvest side shoots, the majority of plants should be harvested in the main shoots, the application of heavy fertilizer, to promote the development of vegetable shoots.
3)Water management: keep the soil moist during the whole life cycle. Summer sunny days morning and evening drenching; rainy days pay attention to drainage, to prevent water on the border; before winter, drought, irrigation and frost, that is, irrigation is drainage, not diffuse irrigation.
4. Timely harvesting:
Cabbage heart to the "flush period" for the harvest standard, most of the precocious varieties only harvest the main shoots, other varieties, generally can be harvested after the main shoots continue to harvest side shoots. Harvest side shoots, cut the main moss at the base of the plant 2 ~ 3 leaves, the use of these two or three axillary buds sprouting side shoots, leaving too many leaves, side shoots, although more but slender, quality is not high. Reach the harvest period, such as low temperature can be late harvest 2 to 3 days, such as high temperature, should be harvested in time.
5. Pest control measures:
1) Epidemic disease, downy mildew: 600 times the epidemic Fengying, or 58% Ruifengmanganese zinc 500 times liquid control.
2) soft rot, black rot: available 20% Lonchococcus 600 times, or 72% agro-streptomycin 3000 times, etc. Control.
3)Virus disease: strictly prevent aphid infection. Virus A, Phytophthora, Virus Bic etc. can be used to spray foliar control after infection.
4)Anthracnose: 25% misonidazole (Note 1) 1500 times solution, or 70% Fo-methyl sulfur wettable powder 800 times solution, etc. Prevention and control.
5) black spot disease, white spot disease: available 40% polysulfide suspension 500 times liquid control.
6) aphids: available 3% nanon aminopyralid microemulsion (Note II) 2000 times liquid, or 10% imidacloprid 1500 times spray.
7)Cabbage greenfly, cabbage moth: can be used 24% Wei water emulsion oil (propane-octane) (Note III) 2000 times liquid, or Bacillus thuringiensis 500 times liquid sprayed in the larvae at a low age.
8) yellow-striped flea beetle: available 20% stubborn insect enemy emulsion (potentized poison) (Note four) 1000 times liquid spray.