This year's autumn cabbage management point is to prevent de-fertilizer, prevent premature aging, reasonable watering. 1, follow up the ball fertilizer, acres of urea 15 kg plus 7-8 kg of potassium sulfate, after the topdressing are required to carry out slow flood irrigation or furrow irrigation, so that the water from both sides of the urn infiltration, not over the sampan. Another time in the middle of the ball, it was called "padding ball fertilizer," and Urea 8-12 kg of urea was applied. Foliar fertilizer can also be sprayed, with 0.1-0.2% potassium dihydrogen phosphate, sprayed once every 7-10 days, a total of three sprays, spraying time after 5 pm is better. 2, a reasonable watering. In this period, the soil is kept moist, which is beneficial to the growth and absorption of roots, and it is easy to damage the root system when it is dry and damp. Water is usually poured 5-7 days, and irrigation is stopped 10 days before harvest. In order to avoid excessive water content of the leaf ball, it is not resistant to storage. 3, pest control aphids can be used 50% anti-inferiority WP 3000 times spray or 10% imidacloprid 2000 times; cabbage caterpillar, beet armyworm can be used pyrethroids + phoxim; bollworm can be used avermectin + Phoxim or Citaibao + chlorpyrifos prevention, prevention and treatment cycle is appropriate for 7-10 days. 4. The main diseases for prevention and control of diseases are soft rot, downy mildew, and viral diseases. Soft rot is a bacterial disease that occurs from the rosette stage to the heart-filling stage. The pathogens invade from the base of the vegetables, the petiole, the leaf margin, and the tip of the leaf ball. The outer leaf of the diseased plant is flat on the ground, the leaf ball is exposed, and the petiole is exposed. Rhizomes from the rhizomes are festered and the ash is brownish and viscous. The odor of hydrogen sulfide is generated at the ulceration site. This is an important feature of the disease. Downy mildew is a fungal disease that is susceptible to disease from the seedling stage to the ball stage. The incidence of cotyledon or tender stems in the seedling stage is yellow and dead. The onset of true leaves begins at the lower part of the leaves, and the primary water-soaked yellowish-yellow spots are not obvious. After a long time, the disease minister has a white frost. Viral diseases are spread with locusts and other viruses. At the time of onset, the veins of the heart and the leaves of the seedlings turn green, causing uneven patches of green mottled or floral leaves; the leaves of adult plants are severely shrunken, hard and brittle, and often have many small brown spots. Necrotic stripe spots, the plants were significantly dwarfed. Prevention and control: Aphid prevention and control at the seedling stage, virus disease at the beginning of the disease with 20% of the virus A WP 500 times or 500 grams of virus Baccarat or 1.5% of plant disease Ling 1000 times control, 7-15 days, a total of 2 spray 3 times; downy mildew can be sprayed with 25% thiophanate-methyl 600-800 times, 75% chlorothalonil 500 times; soft rot, black rot with neemectin 4000 times or 72% agricultural streptomycin Soluble powder 3000 times control, spray 10-15 days, even spray 2-3 times. 5, tied vegetables. For cultivars that do not contain the ball, it is necessary to carry out the 5-10 days before the harvest (in late October). The sheaf affects the yield prematurely and the sheaf is susceptible to freezing damage. 6, timely harvest. After the Chinese cabbage leaves grow into a ball, when the average temperature drops to 5°C on the same day, they must be harvested when they are harvested. My county usually harvested at the Snow Festival in early November.
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