Key points of greenhouse cultivation techniques:

(1) Variety selection should be based on local consumption habits and select disease-resistant, high-quality and high-yielding varieties. Green rapeseed varieties are mostly used for cultivation in northern sunlight greenhouses. Such as Lvhua No. 1, Huawang Canola, Lvxing Qingcai, Qingbang Canola, April Man, May Man, Shanghai Green, etc.

(2) Seedling raising When raising seedlings in the solar greenhouse, the climate is relatively cold, so the seeds should be soaked to accelerate germination and then sowed to facilitate early emergence. The method of seed soaking and accelerating germination is: soaking in water at 20～30℃ for 3～4 hours, accelerating germination at about 20℃, and all budding can be achieved within 24 hours. Seedbeds should be finely prepared, and more organic fertilizers should be used to increase the ground temperature and facilitate the emergence of seedlings. Each hectare requires 600-750 square meters of seedbeds. Pour sole water before sowing, cover 1 cm of soil after sowing, and use 225-300 grams of seed per hectare. After sowing, the temperature should be increased to promote emergence. Keep 20～25℃ during the day and no lower than 10℃ at night. After Qi Miao, the temperature is lowered, 15-22°C during the day and 10°C at night. * After the true leaf is unfolded, perform 1 to 2 thinning. In the seedling stage, but do not water, if the seedbed is dry, water or spray water to replenish. The seedling age is 30 to 35 days and can be planted when it grows to 3 to 4 leaves.

(3) Planting and management after planting ① Planting: Before planting, it is necessary to finely prepare the ground, apply sufficient organic fertilizer, and apply 30,000-45,000 kg of decomposed farm manure per hectare. Make a border of 1 to 1.2 meters wide. The planting row spacing is 15-25 cm square. It can be planted by trenching or digging. The depth of planting seedlings should be that the base of the seedlings * true leaf stalk is level with the ground level. Water well after planting. ②Management after planting: In the early stage of planting, strengthen heat preservation and promote slow seedling. Keep 22～25℃ during the day and no less than 10℃ at night. After slowing the seedlings, cool down to 15-22°C during the day and no less than 5°C at night to avoid low temperature through vernalization and cause immature bolting. During the day, let the wind exceed 25℃, and keep the wind below 15℃. In winter and early spring, the temperature is low, so it is necessary to control watering, cultivate the soil after the seedling, increase the ground temperature, and promote the development of the root system. Topdressing and watering when it grows quickly, topdressing 150-225 kg of ammonium nitrate per hectare (note: do not chase ammonium bicarbonate to prevent fumigation). During the growth period, spray several foliar fertilizers to promote leaf hypertrophy and increase yield.

(4) Harvesting can be carried out 35 to 40 days after planting. It can be divided into several times and listed in succession. If the next crop is affected, it can be harvested and stored in batches.

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