First, a reasonable choice of land
In order to plant cabbage seedlings, loose soil, fertile soil, high dryness, convenient irrigation and drainage, and fewer pests and diseases should be selected as the land for non-cruciferous crops, especially in the case of early rice fields, and greenhouse vegetable lands should be avoided. Prevent the emergence of seedlings or dead seedlings due to excessive soil salt content. It is strictly forbidden to use water for convenience and choose to raise seedlings at the edge of the stream or on a low-lying land in case of typhoon, rain, and flooding.
Second, seed processing
In order to speed up sowing seedlings, reduce seed-borne diseases, and enhance seedling resistance, seeds should be soaked with warm soup or pharmacological agents prior to sowing germination. Soaking in warm water, soak the seed first, then put it in warm water of 55~60°C, stir for 10~15 minutes and soak with fresh water for 10~12 hours; soak in the seed, use 75% chlorothalonil 800 times soaking 10~12 hour. After soaking and disinfecting, moisten germination for 20-24 hours sowing.
Third, facilities to avoid disasters
After sowing, in order to avoid the sun drying or salinization, cover with 2 to 3 shade nets. After 50% of seedlings are established, cover the surface shade nets, etc., and use small arches to shade from the sun. The shade net is covered at 9~16 o'clock on sunny days to reduce the surface temperature, reduce the evaporation of water, extend the interval between watering, and enhance the drought resistance of seedlings. In the event of a typhoon, cover the shade net or nylon membrane.
Fourth, fertilizer and water management
After emergence, water is poured on the seedling soil. Generally, water should be kept as little as possible to prevent soil compaction, affecting the growth of seedlings and the improvement of drought resistance. If it is necessary to use water for irrigation in case of drought, it is better to use gutter irrigation, and waterproof the upper surface. The content of chloride ion in irrigation should be less than 0.06%, and the upper layer of Hejiang River should be suitable, and the bottom water or deep well water with high salt content should be disabled. After 7 days of emergence, monocotyledonous weeds were controlled with 5% konjac herb 750 grams of emulsifiable concentrate to reduce soil moisture evaporation. Under the premise of applying basal fertilizer, no top dressing is generally applied at the seedling stage to prevent the seedlings from overrunning and to reduce the ability to resist drought; if the seedlings are weak, the thin urea solution can be applied in conjunction with irrigation or the extra-root fertilizer can be applied.
V. Pest control
The main diseases of seedling stage include damping-off disease, blight, anthracnose, and downy mildew. The insect pests mainly include Spodoptera litura, Plutella xylostella, Pieris rapae, aphids and aphids. Based on the soil disinfection and light trapping pests, we must use counterpart drugs to control pests and diseases. When using drugs, clean rivers should be used. It is forbidden to use dirty water sources to prevent the decrease of efficacy or blockage of medical equipment. Advocate morning and evening medications to prevent human poisoning or seedling burns.
The day before the planting of seedlings, the seedlings must be thoroughly immersed in water and the medicine should be given to work in Shimoda.
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