科学选网不同规格、不同颜色的遮阳网，遮光的程度不同;不同种类的蔬菜，光合作用的适宜光照强度也不同。所以应根据蔬菜种类和覆盖期间的光照强度，选择适宜的遮阳网。绿叶菜光合作用的适宜光照强度为2万~3万Lx，盛夏酷暑期覆盖时，宜选用遮光率为45%~65%的SZW-12或SZW-14型黑色遮阳网;夏末覆盖时可选遮光率较低的银灰色遮阳网，兼有避蚜作用。
The degree of shading varies with different specifications and colors of shading nets selected scientifically, and the suitable light intensity of photosynthesis varies with different kinds of vegetables. Therefore, the suitable shading net should be selected according to the vegetable species and the light intensity during the covering period. The optimum light intensity for photosynthesis of green leafy vegetables is 20,000-30,000 Lx. SZW-12 or SZW-14 black shading nets with shading rate of 45%-65% are suitable for covering in midsummer and hot summer. Silver-gray shading nets with low shading rate can be selected for covering in late summer, which can also avoid aphids.
因地制宜选用适宜的覆盖方式北方许多地区的温室、大棚、中棚、小棚等保护地设施，一般只进行秋、冬、春保温防寒栽培，夏季多闲置不用。利用遮阳网覆盖，一年可多生产1~2茬生长期短的练叶菜，或进行育苗，提高棚室骨架的利用率，增加产量和收益。
The greenhouse, greenhouse, middle shed, small shed and other protective facilities in many areas of northern China should be selected according to local conditions. Generally, only autumn, winter and spring heat preservation and cold-proof cultivation are carried out, and they are not used in summer. With shading net covering, more than 1 to 2 stubbles of leafy vegetables with short growth period can be produced in one year, or seedlings can be raised, so as to improve the utilization rate of shed skeleton and increase yield and income.