F how to choose the correct shade net

In the production of vegetables, vegetable growers use the method of covering the Shade Net to reduce the temperature, and the shade net should be selected correctly.

One must choose the shade net correctly. The color of the sunshade net on the market is mainly black and silver, and 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, if it is on some hi-light vegetables Use should reduce the coverage time. Although the silver-gray shading nets are not as cool as the black ones, they have little effect on the photosynthesis of vegetables and can be used on solanaceous vegetables and other hi-light vegetables.

Second, we must use shade nets properly. The sunshade net covering method has two kinds of coverage and the pavilion type covering two kinds, in the practical application, the pavilion type covering is smooth because of the air circulation to cool the effect better, use more. The specific method is: using the skeleton of the arch shed to cover the shade net at the top, leaving a ventilation belt of 60 to 80 centimeters wide. If the cover is covered with a film, the shade net can not be directly covered on the film. There should be more than 20 cm of space to facilitate ventilation and cooling.

Although covering the shade net can reduce the temperature, but it also reduces the light intensity, has an adverse effect on the photosynthesis of vegetables, so the coverage time is also very important, should avoid full-day coverage, can be based on between 10 am to 4 pm The temperature is covered and the shade net can be removed when the temperature drops to 30°C. Do not cover on cloudy days to minimize the adverse effects on vegetables.