How can purple cabbage be planted with high yield?

How can purple cabbage be planted with high yield? Please introduce purple cabbage, also known as red cabbage, purple cabbage and so on. This kind of cabbage is cold-resistant and heat-resistant, strong adaptability, high yield, transportation resistance, growth period of 90-120 days, is one of the rare vegetables in Shandong Province, the economic benefit of planting purple cabbage is much higher than that of common cabbage varieties. The soil of seedling bed can take 6-7 parts of positive soil of spring onion and garlic stubble plot, add 3-3 parts of rotten and sifted high-quality ring fertilizer, and then mix in a small amount of diammonium phosphate. Disinfect the seedbed with chlorothalonil or thiram plus antiseptic alum. After soaking the seeds for 2-3 hours, there is no need to accelerate the germination when the seed germination rate is high. The seedlings grow once at the time of 2 leaves and 1 heart. The time of raising seedlings is from late November to early December in winter and spring. The seedling was raised by the method of two-film, that is, the seedling was raised in a small arch greenhouse in the greenhouse. The seedlings of summer stubble were raised in small arch shed from late February to late March. Seedlings are raised in autumn and winter from late July to mid-late August. Because it is rainy in July and August, the seedbed should be built on a plot with high terrain and convenient drainage, and the top of the bed should be shaded by grass or sunshade net. In general, the grass is covered at about 10:00 on a sunny day, and it is opened at 3 p.m., but not on a cloudy day. The land with fertile soil and convenient drainage and irrigation was selected for planting. The seedlings were colonized when they had 6-7 true leaves. Before planting, 5000 kg of organic fertilizer, 30 kg of diammonium phosphate and 50 kg of potassium sulfate were applied every 15 ha. Ridging planting, one planting belt every 150 cm, the width of the border is 110 cm. Plant 2 rows on the border with a spacing of 50 cm and a plant spacing of 35 cm. Within 7-10 days after field management planting, the temperature was controlled at 25-27 ℃ in daytime and 13-15 ℃ at night. Entering the rosette stage and heading stage, the temperature was controlled at 18-20 ℃ in daytime and 12-15 ℃ at night. If the daytime temperature exceeds 25 ℃, open the film to let out the air. Cover the windbreak when the temperature is below 17 ℃. 15 days after slow seedling, combined with watering for the first time, 15-20 kg of urea was applied every 15 ha. Before the lotus leaves were sealed and the globular leaves began to clasp, the second topdressing was applied 10 kg of urea and 5 kg of potassium sulfate every 15 ha. For the third time in the heading period, 20 kg of urea, 10 kg of potassium sulfate and 10 kg of phosphate fertilizer were applied every 15 ha, and then watered. Keep the soil moist during the heading period. Watering should choose sunny and warm weather, cloudy days should not be watered. Disease prevention and pest control (1) black rot and soft rot: diseased plants are pulled out in time, and 77% spray can kill 500 times solution or 300 times neophytomycin solution. (2) Downy mildew: spray 63% alum 500 times or 75% chlorothalonil 500 times solution to control. (3) Sclerotinia disease: spray 1000 times solution of 30% sclerotium net or 1500 times solution of 50% prohydantoin to control. (4) aphids and cabbage insects: control with 3000 times or 3500 times of pyrethrin. (5) if the humidity in the shed is high, the aerosol on the road can be selected for prevention and control. Click to get more cabbage planting techniques click to get more vegetable planting techniques