Key points of High-yield cultivation of Spring Chinese Cabbage in greenhouse

(agricultural Wealth Network) (1) Variety selection. As a cultivated variety of spring Chinese cabbage, the requirement is strict, which is the key to the success or failure of cultivation. Varieties with short growth period and strict requirements for vernalization should be selected. At present, the excellent varieties suitable for spring Chinese cabbage cultivation in China are Beijing Xiaobaikou, Xigaze No. 1, Lu Chunbai l and so on. In addition, you can also choose Japan's unparalleled, Chunguang, disease-resistant 60 days and so on.

(2) sowing at the right time. Chinese cabbage is a seed vernalization crop. The germinated seeds can pass vernalization at a low temperature below 10 ℃ for 15 ~ 30 days, and it is very easy to bolt and blossom at a suitable temperature under long sunshine. Therefore, do not sow seeds too early. Greenhouse cultivation is generally direct seeded in the greenhouse in mid-late February, and if possible, seedlings can be raised in the electric hotbed in the middle and latter ten days of January, and transplanted to the greenhouse in late February. Spring cabbage in greenhouse mainly uses the principle of "devernalization" of daytime high temperature in greenhouse to prevent precocious bolting, and early bolting and early listing.

(3) main points of cultivation. Apply sufficient base fertilizer before sowing, apply at least 3500 kg of stack manure per mu, add 15 kg of urea, 30 kg of calcium superphosphate and 15 kg of potassium chloride. The land should be leveled and made into a high bed, and sow when the soil moisture is good in sunny days. Reasonable close planting, opening holes according to plant row spacing of 40 cm × 25 cm, sowing 5-10 seeds per hole, covering fine soil after sowing, 100-150 grams per mu. After emergence and time seedlings, the seedlings were fixed with 5 ~ 6 leaves, 1 plant per hole. If using point plate to raise seedlings, it is the most suitable. After planting, multiple mulching at night should be done to prevent cold, especially to prevent the continuous effect of low temperature, so as to prevent immature bolting through low temperature vernalization. On the basis of sufficient basal fertilizer, fertilizer and water should be promoted early, and topdressing should be applied several times according to the growth of Chinese cabbage in seedling stage and rosette stage, 10 kg urea should be applied after seedling setting, trench application should be applied between rows, and 15-20 kg N, P and K compound fertilizer per mu should be applied at the end of rosette stage at the beginning of heading stage to promote leaf bulb enrichment. Spring cabbage topdressing should be timely and early, with sufficient fertilizer and water, and "rise in a crowd". Only exuberant vegetative growth can obtain higher yield, and good growth can reduce or delay the occurrence of early bolting to some extent.

(4) Disease and pest control. After the greenhouse spring cabbage enters the rosette stage and heading stage, due to the gradual rise of temperature, various diseases and insect pests occur frequently, such as downy mildew, white spot and soft rot, and cabbage, aphids, diamondback moth and so on. And pay attention to ventilation, the shed temperature should not exceed 25 ℃. ① downy mildew, soft rot, refer to the "winter lettuce cultivation" section. ② white spot disease: at the beginning of the disease, the seeds were disinfected by spraying 50% carbendazim 800 ~ 1000 times or mixing 50 kg seeds with 0. 1 kg carbendazim. ③ Pieris rapae, aphids, Plutella xylostella: refer to the section "cultivation of kale".

(5) timely harvest. When the Chinese cabbage leaf ball has 5-6 leaves, it can be listed according to the market demand. Select the better ball first, sort it out according to the requirements of commercial dishes, and then appear on the market. Spring Chinese cabbage in the greenhouse is on the market from April to May, with a yield of about 3000 kg per mu.