In southern China, it is common to grow cowpeas in autumn and winter. Since autumn and winter often have relatively harsh weather such as drought and cold, nurturing strong seedlings is the basis for the high yield of cowpea cultivation in autumn and winter. If you want to cultivate healthy young seedlings, you must make more efforts in seed treatment and nursery management.
First, choose the seeds of dry seeds in the sun, according to the use of seeds per acre 2 to 3 kg; transplanting seedlings, seed use 1.5 to 2 kg per acre. In order to increase the germination potential and germination rate of the seeds and ensure that the germination is neat and fast, the seeds should be selected and dried. Remove the poor fullness, insects, damage and mildew seeds, choose sunny days on the land for 1 to 2 days.
Second, soaking seeds soaked seeds into the temperature maintained at 25 ~ 30 °C water, soak 2 ~ 3 hours, then drain water to sow. Because the radicles of cowpea are very sensitive to temperature and humidity, they are generally soaked only and do not germinate. Before planting, water the foot and plant it. When sowing, 1 to 3 seeds of 3 to 4 seeds, covering 2 to 3 cm thick.
Third, attention should be paid to temperature management after sowing management. Keep it at about 30°C during the day and 25°C at night to promote seedling excavation. Germination occurs 7 days after sowing at normal temperature and 10 days after emergence. At this point, the temperature should be lowered to maintain the daytime 20 to 25°C and nighttime 14 to 16°C. However, the temperature should not be too low. We must prevent the cold air from invading the roots. The seedling stage of cowpea is generally not top-dressing, but water management must be strengthened to prevent the seedbed from getting too dry and damp, and the relative humidity of the soil is about 70%. Around 7 days before planting, low temperature seedlings were started. Pay attention to ventilation, so that the seedlings will see more light and prevent the seedlings from becoming leggy.
Fourth, strong seedlings The standard age of cowpeas should not be too long. The criteria for age-appropriate seedlings are: calendar seedling age 20 to 25 days, physiological seedling age about 20 cm seedling height, development degree about 25 cm, stem diameter 0.3 cm or less, true leaf 3 to 4 pieces, root system developed without pests and diseases.
First, choose the seeds of dry seeds in the sun, according to the use of seeds per acre 2 to 3 kg; transplanting seedlings, seed use 1.5 to 2 kg per acre. In order to increase the germination potential and germination rate of the seeds and ensure that the germination is neat and fast, the seeds should be selected and dried. Remove the poor fullness, insects, damage and mildew seeds, choose sunny days on the land for 1 to 2 days.
Second, soaking seeds soaked seeds into the temperature maintained at 25 ~ 30 °C water, soak 2 ~ 3 hours, then drain water to sow. Because the radicles of cowpea are very sensitive to temperature and humidity, they are generally soaked only and do not germinate. Before planting, water the foot and plant it. When sowing, 1 to 3 seeds of 3 to 4 seeds, covering 2 to 3 cm thick.
Third, attention should be paid to temperature management after sowing management. Keep it at about 30°C during the day and 25°C at night to promote seedling excavation. Germination occurs 7 days after sowing at normal temperature and 10 days after emergence. At this point, the temperature should be lowered to maintain the daytime 20 to 25°C and nighttime 14 to 16°C. However, the temperature should not be too low. We must prevent the cold air from invading the roots. The seedling stage of cowpea is generally not top-dressing, but water management must be strengthened to prevent the seedbed from getting too dry and damp, and the relative humidity of the soil is about 70%. Around 7 days before planting, low temperature seedlings were started. Pay attention to ventilation, so that the seedlings will see more light and prevent the seedlings from becoming leggy.
Fourth, strong seedlings The standard age of cowpeas should not be too long. The criteria for age-appropriate seedlings are: calendar seedling age 20 to 25 days, physiological seedling age about 20 cm seedling height, development degree about 25 cm, stem diameter 0.3 cm or less, true leaf 3 to 4 pieces, root system developed without pests and diseases.
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