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Vegetable shade net covering cultivation technique
In the autumn in South China, adverse weather such as typhoon rain, strong light, etc. is extremely unfavorable to the growth and development of vegetables. The production of vegetables is difficult, and the market supply is severely insufficient, and the price has skyrocketed. The adoption of shade net covering cultivation techniques can effectively solve the annual supply and stable production and high yield of Dudu vegetables, and generally can increase production by 20-50%. In the fall of South China, the main types of vegetables cultivated by the use of mulch cover are: Chinese cabbage, Chinese cabbage, mustard, early broccoli, Chinese wolfberry, and lettuce. Under normal circumstances, shading nets with shading rates greater than 40% should not be used when green leafy vegetables are grown. In general, black shading nets are not covered directly during the whole growth period so as to avoid production loss due to lack of light. When growing vegetables, Chinese cabbage, small mustard, and kale and other vegetables, black shade nets can be used for floating surface coverage at the seedling stage. After the emergence, silver-gray shading nets are used for flat shed coverage. In September, silver shade nets were used. For non-seasonal production of kale, mustard, alfalfa and lettuce, black shade nets or silver-gray shading nets can be used for full growth period coverage. 1 After the seeds on the floating surface are sown on the surface, the shade net will cover it, and then it will be moistened and moistened. After the emergence, the shading net will be opened to facilitate the emergence of seedlings, seedlings and whole seedlings to increase the survival rate. 2 Covering the small horizontal grid After the seedlings are to be emerged, the shaded net covering the ground can be covered with a small flat shed about 1 meter above the surface of the mulch, and can also be covered with the skeleton of the medium and small arch sheds. Coverage depends on the type of crop, weather and cultivation season, generally high temperature and drought, strong light coverage time can be longer, cloudy, cool weather, less sunshine time coverage time can be shorter: autumn weather has turned cold Kale, mustard, alfalfa, lettuce, etc. generally cover 15 to 20 days. During the shade net covering cultivation, in order to give full play to the shade, cooling and anti-rainstorm effects of the shade net, corresponding cultivation and management measures shall be taken. The cover or shade net should be flexibly controlled according to the weather conditions and the light intensity and temperature requirements of vegetables. Generally should be sunny cover, cloudy exposing; heavy rain cover, light rain cover; sunny noon cover, sooner or later exposed; early cover, late exposing. Less full-green coverage is provided, but kale, mustard, cockroach, and lettuce are covered during the whole growing season when they are used for anti-seasonal cultivation in the summer. After the coverage, they create a microclimate environment that is more suitable for crop growth. The growth rate is obviously accelerated, and the requirements for fertilizer and water are correspondingly higher than non-coverage. At the same time, there are more diseases. Therefore, it is necessary to strengthen the management of fertilizer and water, prevent and control pests and diseases, and must not be lightly managed due to coverage.