Summer cabbage is usually planted from mid-June to mid-July, and harvested from mid-August to mid-September. The summer season is high, the precipitation is large, and the pests and diseases are particularly serious, which has caused great difficulties in the cultivation of Chinese cabbage. The difficulties that Xia Dacai needs to overcome are high temperature ball formation, the effects of heavy rain, drought and the impact of pests and diseases. The pollution-free cultivation techniques are now introduced as follows. 1. Choose excellent varieties It is generally believed that Chinese cabbage varieties that can normally form balls under the condition that the average temperature continues to exceed 25 °C can be cultivated as summer cabbage, and should also have the characteristics of early maturity, disease resistance and moisture resistance. The main varieties are Yuyuan 50, Xiayang 50, Xiaoza 50, and heat-resistant 45. 2, ridge turf It is necessary to select the land where the cruciferous vegetables have not been planted before, after the harvest of the upper crops, remove the weeds and residual plants, and combine the land preparation, 667 square meters of fermented farmyard manure 3000-4000kg, cake fertilizer 100kg, diammonium phosphate 15~ 20kg, potassium fertilizer 10~15kg, zinc sulfate 10kg. Deeply cultivate and fine-tune the land. In order to facilitate drainage, it must be cultivated with high ridge or sorghum, with a ridge distance of 40cm and a width of 80cm. In order to control pests and diseases, 0.75kg of methyl thiophanate plus 10kg of fine soil can be used for 667 square meters to make the soil. After the ground is well, the soil is applied to the surface and then ridged. 3, fine seeding The sowing date is from mid-June to mid-July, and strives to broadcast a whole seedling. The seed germination rate should be above 80%. In order to save seeds during live broadcast, it is better to use hole broadcasting. 50-100g per 667 square meters of seed, covered with 0.5cm thick fine soil after sowing, and flattened and compacted. Watering should be done immediately after sowing, watering should be poured, but it is better to not bury the ridge. At the same time, after sowing, you should not scatter the poisonous valley overnight (mix the wheat bran or corn flour with phoxim or trichlorfon), and scatter the poisonous valley 2 or 3 times before planting. In addition, in order to ensure the whole seedling, it is also possible to transplant seedlings and transplant seedlings. After the sowing, the film can be used to protect the rain from rain and sunshade to prevent heavy rain and exposure. In addition to the pest control period, the pests should be concentrated once before transplanting to prevent the pests from being brought into the field. 4. Field management 4.1 seedlings, seedlings It is necessary to fix the seedlings in the morning. The first seedling was carried out in 2 to 3 leaves, and the second seedling was carried out in 5 to 6 leaves, and 7 to 8 leaves were fixed. When the seedlings are fixed, prevent root damage to prevent soft rot, and 3000 to 4000 plants per 667 square meters. 4.2 Fertilizer management The heat-resistant Chinese cabbage has a short growth period, especially the ball-forming period is less than 20 days, and the outer leaves grow fast. The cultivation should be based on promotion and not seedlings. The summer temperature is high, the soil moisture evaporates quickly, and the soil should be kept moist at all times to prevent the soil from being uneven. In high temperature and dry weather, the amount of water should be increased. When it rains or after rain, it should be drained in time to prevent water accumulation in the field. Cause rotten roots. Xia Dabai cabbage is poured 10 times in the first 10 to 15 days, irrigating and weeding. After watering, chase after a strong heart fertilizer, pay attention to maintain soil moisture during the ball-forming period, keep the surface and see no wet, combined with watering 667 square meters of urea 10kg or ammonium sulfate 15kg, mainly by point application or ditch application. The fertilization point should be kept away from the plant to avoid burning the root system. Stop watering 5-7 days before harvest, which is the key to the harvest of summer cabbage. At the same time, prevention of seedlings, grassland and insects is another key to the success of summer cabbage cultivation. For cooling and weeding, cover the field with wheat straw or straw. 5. Pest control The main diseases are viral diseases, downy mildew and soft rot, and the diseased plants should be removed in time. In the early stage of the disease, the virus is sprayed with 1.5% phytopathogenic 1000 times solution, or 20% virus A500 times solution, or 3% bacteria toxic clear 300 times solution. Downy mildew can be controlled with 75% chlorothalonil wettable powder 500 times solution, or 50% toxic mycelium manganese zinc 500-600 times liquid or 72% frost WP in the early stage of the disease. In the early stage of the disease, soft rot is used with 60% DTM WP 500 times per 667 square meters, or 72% agricultural streptomycin WP 3000-4000 times, or neomycin 4000-5000 times. Or 401 antibacterial agent 500 times solution for spray control. The main pests are cabbage caterpillar, diamondback moth, rapeseed meal, etc. The use of pesticides should be controlled by biological pesticides or pesticides with high efficiency, low toxicity, low residue and short residual period. The control of cabbage caterpillars can be sprayed at the beginning of the egg hatching period, using 25 to 30 g of Bt wettable powder or 100 to 150 ml of Bt emulsion (diluted 500 to 700 times) per 667 square meters, and spraying once every 7 days. Plutella xylostella can be sprayed with 40 to 50 g of Bt wettable powder or 200 to 250 ml of Bt emulsion (diluted 500 to 700 times) per 667 square meters before the larvae 3 years old, and sprayed once every 5 to 7 days. 3 times. 1.8% worm emulsifiable concentrate 3000-4000 times liquid, prevention and treatment of 1 to 2 years old Plutella xylostella and 2nd instar larvae. 15% suspending agent 3500 times liquid to control Plutella xylostella, 7000 times liquid to control cabbage caterpillar. 6, timely harvest The temperature of summer cabbage is high during the growth period. Although most of the varieties have good heat resistance and can be well-kept in a well-managed manner, with the filling of the leaf ball, the immunity is reduced, and the heat resistance and disease resistance are reduced. Timely harvest, easy to loose balls, bad balls. Generally harvested from mid-August to mid-September, it can be harvested as early as possible, and harvest should be carried out in the morning and evening. Gut Healthy Mints,Gut Probiotic Mints,Gut Healthy Fresh Mints,Probioraplus Dental Probiotic Soar Biotech Co.,Ltd , https://www.xylitgum.com
