The method of covering the shading net to reduce the temperature is widely used by vegetable farmers in production. The correct method is described below:
First, you must choose the correct shade net. The shade nets on the market are mainly black and silver gray. The black shading rate is high and the cooling effect is good, but it has a greater impact on photosynthesis and is more suitable for use on leafy vegetables. The use of it on some hi-light vegetables should reduce the coverage time. Although the silver-gray shade net is not as cool as the black one, it has less impact on the photosynthesis of vegetables and can be used on hi-light vegetables such as eggplant and fruits.
Second, we must use shade nets correctly. There are two types of shade net covering methods: gazebo covering and gazebo covering. In practical applications, gazebo covering is more effective because of smooth air circulation and cooling, and it is used more. The specific method is: The skeleton covers the sunshade net on the top, leaving a ventilation band of 60 to 80 cm on it. If it is covered with a film, the sunshade net cannot be directly covered on the film, and a gap of more than 20 cm should be left to use the wind to cool down.
Although covering the sunshade net can reduce the temperature, it also reduces the light intensity, which adversely affects the photosynthesis of vegetables, so the coverage time is also important.It should be avoided throughout the day.It can be used between 10am to 4pm Cover the high and low temperatures. When the temperature drops to 30 ° C, remove the sunshade net. Do not cover it on cloudy days to minimize the adverse effects on vegetables.