Precautions for using a sun screen

In our greenhouse planting, the use of greenhouse shade screen should pay attention to what matters?According to China's climate, in mid-to-late September, when the rainy season ends, coverage can be carried out. From February to mid-april is the main coverage period.During this period, in the case of long-term rain, greenhouses should be temporarily rolled up to enhance the light.

Sowing to the seedling before the furrow cover, do not remove the net, but must pay attention to the seedling in time after the evening.Floating surface can also be covered after transplanting seedlings to survival, but it should be managed by day cover and night cover.In early spring, after the planting of guadagoume and legume vegetables, anti-frost coverage can be carried out. It can be covered on the small arch shed or the small arch shed in the big shed. If it is covered on the film small arch shed, the anti-frost effect will be better.

Summer covered greenhouse sunshade net according to the climate and vegetable varieties, growth, timely Internet, jie net, such as rainy days to jie net, sunny morning and evening can also jie net, 47 degrees above the temperature generally from 8 am to cover net, 3 PM jie net.The mulch culture was selected according to different needs.For example, the Chinese cabbage, Chinese mustard and Chinese coriander planted in summer cannot grow normally under the condition of high temperature and strong light in summer.

In general, it is recommended to use a kind of sunshade net with moderate sunshade rate.In winter and spring, it is better to choose the network with high light transmittance. In summer and autumn, seedlings are raised or slow seedlings are covered in a short term. Black network with low light transmittance is often used.