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，夏季多闲置不用纤维 驱鸟设备 保定通风管道 塑料土工格栅 检查井模具 流水槽模具 锻造厂家 华尔街铜牛
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.