1. Select fine varieties: Fine varieties should have the advantages of high temperature resistance, ballistic resistance, short period of growth, and good commercial quality, such as Xiabai 45, Xiabai 50 and other summer special varieties, basically having the above characteristics, and applicable scope. wide.
2. Apply basic fertilizers, high-ridge cultivation; to control the occurrence and damage of pests and diseases. The fields with high topography and convenient drainage and irrigation should be selected. Since the growth period of summer cabbage is short, more basic fertilizer should be used to promote growth. In general, 3,000 kg of farmyard manure is used per mu, and 40-50 kg of compound fertilizer containing N, P, and K. The best ridge cultivation, not only drainage and irrigation convenience and good ventilation and light transmission. Generally, the ridge distance is 50-55cm, the ridge width is 20-30cm, and the ridge height is 10-15cm.
3, suitable for planting a reasonable close planting, the best sowing date in our area is mid-June, generally 3000-3500 plants per acre. In order to protect the seedlings, seedlings can be planted on the ridges before sowing, and they can also be planted according to the determined spacing. If the waterlogging condition is not good, it can be sowed in the ditch or inside the hole, then the cover soil is watered with 0.5-1cm, and then it is poured again after 2 days. The emergence can be started within 3-5 days. After the emergence of moist, split seedlings, seedlings in time to make up the seedlings 2 cotyledons when the start of the seedlings when the time between the beginning of the seedlings 5-6 true leaves when the seedlings fill the seedlings.
4, strengthen the management of fertilizer and water control pests: fertilizer, water, early attack, a promotion in the end. In the early stage of ball-bearing, the fertilizer can be top-dressed. On the basis of applying base fertilizer, 25-30 kg of urea can be topdressed per mu, and then the ridge can be watered. Usually, the fertilizer can be recovered once. After the seedlings are kept moist on the ridges, they should pay more attention to watering when they enter the ball stage. Usually 3-5 days once. Stop watering for 5 days before harvest. In case of heavy rain, it should be drained in time. In the prevention and control of pests and diseases, it is important to control soft rot and dry smut. Anti-soft rot can be sprayed with neemectin 400 times and antibacterial agent 401500-600 times in the early stage of Chinese cabbage. When spraying, care should be taken to spray once every 7-10 days on the petiole and roots. The diseased plant was found to be removed promptly. At the beginning of the ball, spray 0.3% calcium chloride solution in combination with spraying to control the occurrence of dry burning. In the prevention and control of pests, it mainly controls cabbage caterpillars, aphids, and diamondback moths.
5, timely harvest: timely harvest after tight ball can increase field permeability, reduce pests and diseases. The sooner the general listing is, the better the benefits will be, and the late harvest will easily lead to fissile ball, and the disease will increase, affecting the quality and efficiency of Chinese cabbage.
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