Over-winter cultivation method of cowpea in greenhouse
I. Reasonable close planting Due to the low temperature and low light environment in wintering, the photosynthesis is blocked, and the nutrient production of the plant itself is limited. Therefore, it must not be too dense when planting, in order to prevent the leaves from blocking each other. Generally take 70 cm, 50 cm size rowing, the hole spacing is 27 ~ 30 cm, 2 ~ 3 per hole, watering after planting, after raking the mulch.
Second, the field management In winter, strengthen the cover insulation, strengthen the lighting, often wipe the film, so that the light transmission is good, it is best to hang the reflective curtain in the shed.
In the management of fertilizer and water, water should be poured as little as possible. Before the flowering of the cowpeas and before the flowering of the cowpeas, 15 kg of ammonium sulfate per mu is applied. During the pod-forming period, the fertilizer is applied once every 10 to 15 days, and 15 to 20 kg of ammonium sulfate is applied each time. Conditional, after flowering, apply carbon dioxide gas fertilizer every day from 8 to 10 am, and properly ventilate for 2 hours after application. In the late growth stage of cowpea, the plant is senescent and the roots are aging. In order to prolong the pod formation, foliar fertilization can be carried out with 0.2% potassium dihydrogen phosphate.
After the peas are stretched, the vines are placed in time to stalk the vines. Afterwards, the smashing and smearing are carried out in time, and the leaves are prevented from blocking each other. When the plant height is 2 to 2.5 meters, the heart is picked up in time to promote pod formation. Pay attention to destroy the lower old leaves after each harvest. When the main branch of dwarf cowpea is 30 cm high, it can be used to promote the early branching, which is beneficial to the growth of pods and increase the rate of flowering and pod formation.
Third, timely harvest, prevention of pests and diseases Cowpeas should be harvested in time to prevent premature aging, generally harvested 13 to 16 days after flowering. Cowpeas are planted in greenhouses. Because they are in a low-temperature and high-humidity environment, they are poorly ventilated and are prone to rust. If the humidity in the shed is too high, you can choose to put a small wind at noon on sunny days to reduce the humidity.
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