Essentials of Rape Greenhouse Cultivation Technology

Key points of greenhouse cultivation technology:

(1) Variety selection should select disease-resistant, high-quality and high-yield varieties according to local consumption habits. In the northern solar greenhouse cultivation, green rapeseed varieties are mostly used. Such as Lvhua No. 1, Huawang Rape, Green Star Greens, Green Gang Rape, Slow in April, Slow in May, Shanghai Qing, etc.

(2) When raising seedlings in a solar greenhouse, the climate is colder, sowing seeds should be sowed after sowing to facilitate early emergence. The method of seed soaking and germination is: soaking in water at 20-30°C for 3 to 4 hours, and germinating at about 20°C, all of which can germinate in 24 hours. The seed bed should be finely prepared, and more organic fertilizer should be applied to increase the ground temperature and facilitate seedling emergence. The seed bed should be 600-750 square meters per hectare. Before planting, pour enough water in the bottom, cover the soil by 1 cm after sowing, and use 225-300 grams per hectare. After sowing, the temperature should be increased to promote emergence. Maintain 20 ~ 25 ℃ during the day, not less than 10 ℃ at night. After the seedlings cool down, the temperature will be 15-22°C during the day and 10°C at night. *After unfolding the true leaves, perform 1 to 2 seedlings. In the seedling stage, it is not watered. If the bed is dry, water or spray water to replenish it. The seedlings are 30 to 35 days old and can be planted when they reach 3 to 4 leaves.

(3) Management after planting and after planting ① Planting: Before planting, it is necessary to carefully prepare the land, apply enough organic fertilizer, and apply 30,000 to 45,000 kilograms of farm manure per hectare. It is made into a border of 1～1.2 meters wide. The plant spacing is 15-25 cm square. It can be planted by ditching or digging. The depth of planting seedlings should be equal to the base of the seedling * true leaf petiole and the ground plane. Pour water after planting. ② Management after planting: In the early stage of planting, strengthen heat preservation and promote slow seedling. Maintain 22 ~ 25 ℃ during the day, not less than 10 ℃ at night. After slowing seedlings, lower the temperature, 15～22℃ in the daytime and not less than 5℃ in the nighttime, in order to avoid the low temperature through vernalization, causing unripe bolting. During the day, the temperature exceeds 25°C and the wind is lower than 15°C. In winter and early spring, when the temperature is low, it is necessary to control watering, slow down after cultivating and loosening the soil, raise the ground temperature, and promote root development. When it grows quickly, it should be topdressed and watered at a rate of 150-225 kg per hectare of ammonium nitrate (note: do not follow ammonium bicarbonate to prevent smoked seedlings). During growth, spray foliar fertilizer several times to promote leaf hypertrophy and increase yield.

(4) It can be harvested 35 to 40 days after harvesting and planting, which can be carried out several times and listed on the market one after another. If it affects the next crop, all can be harvested and stored and listed in batches.

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