The first crop of cowpea has a large amount of flowering, more pods, and high nutrient consumption, which easily affects the differentiation of the second crop, and even premature senescence. To increase the yield in the later stage, the management of the pod-setting period is very important. It is not necessary to supplement the fertilizer to promote the pod-setting. It is necessary to strengthen the root maintenance, supplement the medium and trace elements, and promote the subsequent flower bud differentiation. Use biological agents to improve soil and promote roots

During the pod-setting period of cowpea, many vegetable farmers look at the large pod-setting and high nutritional requirements, and they mainly pay attention to the supplement of nitrogen, phosphorus and potassium nutrition, but ignore the root maintenance. In the pod-setting period, the consumption of organic nutrients is the most, and the amount of organic nutrients obtained by the root system will inevitably be affected, which will easily cause the decrease of new roots and subsequent fatigue.

Master Zhang also attached great importance to this period. After years of experimentation, Master Zhang chose to use biological agents continuously. At present, there are many types of rooting agents on the market, and some are expensive, but on the whole, these rooting agents are mostly "strength". At that time, they promoted rooting, and there was no nutrient support from the leaves, and soon disappeared again, and the effect is difficult to guarantee. . The use of biological inoculants starts from improving the soil, which lasts and promotes rooting slowly, without side effects, and has a lasting effect. When choosing a biological inoculum, vegetable growers can choose Bacillus subtilis and Bacillus polymyxa with the pesticide registration number, or they can purchase the strains and ferment them in the shed themselves, such as choosing Guiyuan No. 1 biological inoculum with soybean meal, etc. After about half a month of fermentation, it can be used as a bio-bacteria fertilization, supplementing fertilizer and promoting roots, and the effect is good. Early supplement of calcium and magnesium and other trace element fertilizers

During the flowering and pod-setting stage of cowpea, the nutrient needs are large, but nutrition is not only nitrogen, phosphorus and potassium fertilizers, but medium and trace factors are also important. However, vegetable farmers often only pay attention to nitrogen, phosphorus and potassium, and ignore medium and trace element fertilizers, which may cause some physiological problems. . For example, when calcium is lacking, it will lead to poor growth of the grains, problems such as pointed ends and broken kernels; when lacking boron, the flowering is small and it is difficult to sit on the pod...

In the pod-setting stage, if you want to promote flower bud differentiation, the role of middle and trace elements cannot be replaced. There are many stems and leaves in the pod-setting stage, and it is difficult to spray. Vegetable farmers should use watering as the basis and reasonably mix topdressing fertilizer. On the basis of using NPK water-soluble fertilizer, Ishihara Taurus suspended calcium 1 liter/mu, particulate boron 100 g/mu, molybdenum fertilizer 50 g/mu, Rongdimei monosilicic acid 500 ml/mu, etc. Water flushing is sufficient. Strengthen environmental regulation

During the pod-setting stage, there is a lot of nutrient consumption, and attention should be paid to environmental regulation to increase photosynthetic efficiency and inhibit respiratory consumption. One is to add carbon dioxide. In spring, the sun is good, the temperature is suitable, and the lack of carbon dioxide is often the main factor affecting photosynthetic efficiency. It is necessary to pay attention to reasonable ventilation. Within 1 hour of heat preservation, ventilation should be started to supplement the carbon dioxide in the shed to improve the photosynthetic efficiency. When cold air arrives, the greenhouse heating block can be ignited in the shed to increase the temperature while adding carbon dioxide. The second is to control the night temperature. As the temperature rises, too high night temperature is also an important factor in increasing nutrient consumption. Pay attention to closing the vents at night and cover the insulation at night to ensure that the temperature in the shed is below 15 ℃ in the morning. The third is to spray Bacillus subtilis, Trichoderma harzianum, chitosan, etc., to prevent diseases and nourish the leaves to improve disease resistance.

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