1 Cultivation of strong seedlings: Cabbage has ordinary cabbage, wrinkled cabbage, purple cabbage type. Sponge cultivation should be selected early maturing, disease resistance, winter and strong varieties, there are spring, Primula, Jin Gan No. 8, No. 11 in Gan et al., Seed by seed selection, disinfection, germination after planting. The seedbed should be prepared from loose and fertile garden soil and decomposed horse manure, grass charcoal and compost. The nutrient soil preparation method is as follows:
　　 a . Compost maturity six, four fertile garden soil.
　　 b . 3 parts of horse manure composting, composting peat 3 parts, 3 parts garden soil fertilizer.
　　 c. decomposition of peat 5 parts, 5 parts of garden soil fertilizer. The nutrient soil is mixed and sieved. The spring-early cabbage should be carried out in a greenhouse or a hotbed. The nutrient soil should be strictly disinfected and then distributed to the seedbed. Moisturize and moisturize after sowing.
The standard of strong seedlings is: not prematurely through the vernalization stage, with 6 to 8 true leaves, thick stems, short internodes, thick leaves, dark color, developed roots, strong resistance, and quick seedlings after planting.
In order to ensure that the spring cabbage of the seedlings can form the leaf ball smoothly, the following measures must be taken: a . Choose winter varieties, such as Zhonggan 11 and 83-98 ; if you choose winter varieties, you must delay the sowing period.
　　 b . Sowing should not be too early, so that the size of the seedlings grows fairly. When the leap year is mature, the size of the seedlings must not exceed the limit of the vernalization stage.
　　 c . According to the climate change, the seedlings should be treated. When the winter is warm, the seedlings should be controlled to grow too much. The identification of the seedlings should be done, and the seedlings and suspicious twitch seedlings should be eliminated.
　　 d . Do a good job of pure rejuvenation, use spring sowing cabbage to pick and plant, and often eliminate early twitching plants.
2 Re-application of base fertilizer, timely planting: the weeds are cleared in time after harvesting, and the ploughing is carried out. 15 days before sowing, the fertilized organic fertilizer per hectare is 30,000 to 75,000 kg, and the nitrogen, phosphorus and potassium compound fertilizer is 450 to 600 kg. Deep tillage, smoothing, and timely planting.
3 skill application of top dressing: after planting, pouring 2 ~ 3 times slow seedling water. After 7 to 10 days of survival , pour a thin layer of water and apply 750 to 1050 kg of decomposed manure per hectare . After 15 to 20 days of planting, apply the fertilizer, Apply 225 kg of urea per hectare . Beware started by holding timely, typically every 10 to 15 days Debris fat 1, fat to decomposition of manure, cake and other organic fertilizer, applied with a small amount of fertilizer. The principle of topdressing is the former Concentrated, mainly in the early stage, with nitrogen fertilizer, and later with phosphorus and potassium fertilizer. In the early and mid cabbage each dressing 1, to promote the package ball. Each time human waste is 15,000 kg / ha, ternary compound fertilizer 300 ~ 600 kg / public Are.Led Dimmer,Light Dimmer,Dimmer Lamp,Dimmer For Led Lights
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