Key points of greenhouse cultivation techniques:

(1) Variety selection According to local consumption habits, disease-resistant, high-quality and high-yield varieties should be selected. In the northern sunlight greenhouse cultivation, green rape varieties are mostly used. Such as Lvhua No.1, Huawang rape, Green Star cabbage, Qingbang rape, Slow April, Slow May, Shanghai Green and so on.

(2) Seedling breeding in the greenhouse, the climate is relatively cold, sowing seeds should be soaked after germination so as to facilitate early emergence. Seed soaking and germination method is: immersion in water at 20 to 30 ° C for 3 to 4 hours, germination at about 20 ° C, and full germination in 24 hours. The seedbed should be finely prepared, and more organic fertilizers should be applied to increase the ground temperature and facilitate the emergence of seedlings. 600-750 square meters of seedbed per hectare is required. Water the bottom water before sowing, cover the soil with 1 cm after sowing, and use 225 to 300 grams per hectare. After sowing, the temperature should be increased to promote emergence. Keep it at 20 ~ 25 ℃ during the day and not lower than 10 ℃ at night. After the seedlings are cooled, the temperature is 15-22 ° C during the day and kept above 10 ° C at night. * After the true leaves are unfolded, 1 to 2 seedlings are performed. Seedling stage, but do not water, if the seed bed is dry, water or spray water supply. Seedlings are 30 to 35 days old and can be planted when they reach 3 to 4 leaves.

(3) Planting and management after planting ① Planting: Before planting, finely prepare the land, apply sufficient organic fertilizer, and apply 30,000 to 45,000 kg of rotten farmhouse fertilizer per hectare. Make crickets 1 to 1.2 meters wide. The planting distance is 15-25 cm square. Can be ditched or burrowed. The depth of planting seedlings should be at the level of the base of the seedling * true leaf petiole and the ground plane. Water it after planting. ② Management after planting: In the initial stage of planting, strengthen insulation and promote slow seedlings. Keep 22 ~ 25 ℃ during the day and not lower than 10 ℃ at night. After the seedlings are slowed down, the temperature is reduced to 15-22 ° C during the day and not lower than 5 ° C at night to avoid low temperature through vernalization and causing immature pumping. During the day, the air temperature is higher than 25 ℃, and the temperature is lower than 15 ℃. In winter and early spring, the temperature is low, watering should be controlled, and the loose soil will be cultivated after the seedlings are raised to increase ground temperature and promote root development. Fertilizing and watering when it grows fast when it is opened, 150-225 kg of ammonium nitrate per hectare, (note: do not chase ammonium bicarbonate to prevent fumigation). During growth, spray foliar fertilizer several times to promote leaf hypertrophy and increase yield.

(4) Harvesting can be done 35 to 40 days after planting, and it can be divided into several times, and they will be listed on the market. If it affects the next crop, it can be harvested and stored in batches and listed in batches.

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