Detailed explanation of key techniques for off-season cultivation of asparagus in greenhouses
Variety selection: choose hybrid varieties with strong disease resistance and fast growth, such as 2000-3 and Champion. For sowing and raising seedlings, mainly raise seedlings from February to April. Soak seeds in a 300-fold dilution of 50% carbendazim wettable powder for 12 hours, then soak them in warm water at 30-35°C for 2-3 days, remove the seeds, cover with a wet towel for germination, and rinse the seeds with warm water twice a day...
Variety selection: choose hybrid varieties with strong disease resistance and fast growth, such as 2000-3 and Champion.
Sowing and raising seedlings: mainly raise seedlings from February to April. Soak seeds in a 300-fold dilution of 50% carbendazim wettable powder for 12 hours, then soak them in warm water at 30-35°C for 2-3 days, remove the seeds, cover with a wet towel for germination, and rinse the seeds with warm water twice a day. Sow after 10% of the seeds have sprouted. Prepare nutrient soil and make nutrient soil blocks 10 cm square, sow one seed per hole, and cover with 2 cm of fine soil. Inside the arched film, control the daytime temperature at 25-30°C and the nighttime temperature at 15-18°C. When the temperature exceeds 32°C, ventilate promptly to harden the seedlings. Transplant when the seedlings have grown more than 3 aboveground stems.
Transplanting and field planting: build the shed in an east-west direction and plant in a north-south direction. (1) Dig planting furrows. On deeply plowed and leveled ground, run a straight line in a north-south row direction at a row spacing of 120 cm, and dig planting furrows along the line, with a furrow width of 40 cm and a furrow depth of 40-50 cm. (2) Apply fertilizer and fill the furrows. Mix 5000 kg of farmyard manure and 50 kg of ternary compound fertilizer with soil per mu and fill them into the furrows. (3) Plant carefully. Place the nutrient soil blocks in the furrows at a plant spacing of 25 cm, with the seedling rhizome disc 13 cm below ground level, then water so that the soil settles naturally.