In the early stage, it is necessary to properly control water and squat seedlings to promote reproductive growth and form more inflorescences. In spring cultivation, fertilizer and water should be properly controlled in the early stage, and gradually increased after the first inflorescence bears pods to promote growth, with more flowers and pods.
At the beginning of pod harvest, topdressing should be continued. Topdressing 1 time every 4-5 days, and continuous topdressing for 3-4 times. Apply 40-50kg of common compound fertilizer or 0/000kg of human excrement/kloc-0 to each acre of hole, and water after fertilization. Autumn cultivation should be extended to the end. Film-covered spring cowpea has developed root system, strong fertility absorption, less topdressing times and needs more base fertilizer.
Extended data
Cowpea needs to be rotated for more than two years to avoid continuous cropping, otherwise it is easy to get sick. After harvesting, plough deeply for 20-30cm, and apply 3000kg of base fertilizer, 25-30kg of calcium superphosphate, 50-75kg of plant ash or rice bran ash or10-20kg of potassium sulfate per mu. 75- 100 kg lime can be properly added to the acidic soil, and then the soil is broken and raked to make a ridge with a width of 1.3 m.
Cowpea advocates seedling raising and transplanting in early spring, because the temperature is low and there is much rain. After the seedlings are unearthed, the first pair of true leaves should be planted before unfolding, and the principle of planting small leaves and planting drought should be mastered. When planting, plant two trees in each hole. In summer and autumn, cowpea is mostly planted directly, with 3-4 seeds per hole and 4-5 seeds at most, and two seeds are left between holes after emergence. The planting density is 0.8- 1m for row spacing and 0.26-0.33m for plant spacing.