Application technology of shading net

The shading net has the functions of shading and cooling, avoiding aphids and preventing diseases, preventing hail and reducing disasters, and increasing temperature. It has the characteristics of low cost, high efficiency, labor-saving and labor-saving. It is widely used in the production of vegetables and flowers in summer and the breeding of seedlings in autumn and winter.
Function and efficacy:
（1） Insect and virus prevention: cover the sun screen to isolate pests and vegetables. Basically, it can avoid the harm of cabbage caterpillar, cabbage Spodoptera, aphid, whitefly and other pests and control the occurrence of virus diseases. The infection rate of diseases and pests decreased by 54-60%.
（2） Cooling and heat preservation are conducive to seedling emergence: July August is the high temperature season in northern China. Due to high temperature and drought, seedling emergence is affected. Covering the shading net can reduce the temperature in the shed, reduce evaporation, keep the soil moist, and increase the seedling emergence rate of vegetables by 20-30%.
（3） Windproof and rainstorm prevention: strong wind and rainstorm will cause damage to vegetables and cause seedling inversion. After covering the shading net, the wind speed can be reduced by 20-25%. The impact force of the rainstorm is weakened by the shadow impact of the net, and it has become a drizzle in the shed, which is conducive to the development and growth of crops.
（4） Prevent the seedlings from being burned by excessive sunshine: in hot summer, the seedlings will be burned by direct sunlight, and the shading net will reduce the light intensity by 40-50%, so as to avoid burning.