First, choose excellent varieties

According to the local climatic conditions, cultivation techniques and the growth period, disease resistance and storability of the relevant varieties, select suitable varieties. Generally, the land with good fertilizer and water conditions is high, late and medium mature; the land with poor fertilizer and water conditions is short and the variety is shorter.

Second, choose a good mouth, apply enough base fertilizer

Planting autumn cabbage should not choose cruciferous vegetable mouthwash. It is necessary to smash early and prematurely, and suppress the sputum to facilitate the emergence of the whole seedlings. To apply the base fertilizer, it is best to use nitrogen, phosphorus and potassium mixed fertilization, 30 cubic meters to 50 cubic meters of high-quality farmyard manure per hectare, 250 kg of diammonium or 500 kg to 800 kg of superphosphate.

Third, choose the appropriate sowing date

Whether cabbage is high-yield or not, it is very important to determine the suitable sowing date of autumn cabbage. The optimum temperature for growth of Chinese cabbage is 10 °C ~ 23 °C, and the heat resistance is strong in the seedling stage, while the mild growth conditions are required throughout the growing season. The temperature difference between day and night is large, which can promote the Chinese cabbage and improve the quality. According to the growth characteristics of Chinese cabbage, the general sowing date is selected from July 20th to 30th. In case of rainy weather, the sowing date can be advanced from 1 day to 2 days. Seeds should be selected before planting to remove impurities. If there is no rain during the sowing period, it must be watered and then planted. The seeding rate per hectare is 8 kg to 10 kg. Seeds should be scattered when sowing, which is good for seedlings and seedlings.

Fourth, field management

1. When the seedlings were seeded, the first seedlings were taken, and 3 to 4 strains were left per hole. When the seedlings are 6 to 8 leaves, the seedlings should be fixed in the afternoon.

2. Manage the fertilizer water on the basis of applying the base fertilizer, generally chasing 2 to 3 times of fertilizer. After the first top dressing, after the seedlings are planted, the weight of ammonium nitrate is 200 kg to 300 kg per hectare. The second top dressing after pumping, 300 kg to 350 kg of ammonium nitrate per hectare, combined with watering, can apply 1 time of decomposing human excrement. Apply 15 tons to 20 tons per hectare. After the cabbage enters the barreling period, it should be replenished with a large amount of water. Water should be poured every 7 days to 8 days. The soil should be kept moist during the ball-forming period. Generally, the water is poured once every 5 days to 6 days, and the first 8 days before the harvest period. Watering for easy harvesting and transportation. In order to promote the cabbage heart, at this time, 0.2% to 0.3% of diammonium phosphate solution or urea solution can be sprayed once or twice.

3. Control pests and diseases mainly to prevent four diseases and five insects. The main diseases of Chinese cabbage include viral diseases, downy mildew, leukoplakia and soft rot. Controlling viral diseases by pouring warm water at the seedling stage; controlling downy mildew with 40% ethylphosphorus aluminum 300 times solution and 70% mancozeb 500 times solution; using 5% carbendazim 500 times solution or 70% mancozeb White spot disease, using 150 ppm streptomycin sulfate to control soft rot. The main pests of Chinese cabbage have jumps (left and right structures of insects), aphids, cabbage caterpillars, cabbage larvae, and mantle. When the seedlings are unearthed, the medicated medicinal herbs should be taken in time, and 120 kg to 150 kg of insecticidal powder or 90% trichlorfon 100 times solution per hectare. At the seedling stage, attention should be paid to the control of aphids, and 40% of the dimethoate emulsion was used to control the aphids. During the growth period of Chinese cabbage, attention should also be paid to the control of cabbage caterpillars and cabbage night larvae. BT emulsion can be used before the age of 3, 3 kg ~ 4.5 kg per hectare, add 750 kg of water, spray once every 7 days, even spray 2 times. In the first ten days of the harvest, pay attention to the occurrence of locusts in the warm weather. If it happens, it should be quickly eliminated.

( proud double)