The role of shading in greenhouses

(1) Shading effect: the sunshade net reduces the light intensity in the greenhouse, the greater the density specification, the better the sunshade, and the same specification black is better than silver gray sunshade.

(2) Cooling effect: The temperature in the shed is reduced due to the coverage of the sunshade net, and the cooling range of the surface and the soil cultivation layer is ideal. From 10 am to 2 pm, the temperature in the upper part of the greenhouse is 37-40 ℃ higher, while the temperature around the surface plants is at 22 ─ 26 ℃, soil temperature between 18 ─ 22 ℃, suitable for crop growth.

(3) Moisture conservation and anti-storm rain: the evaporation in the shed is reduced, the soil moisture content is higher than that in the open field, and the topsoil is moist. Because the sunshade net has mechanical strength and is relatively dense, it can decompose the rainstorm into drizzle, avoiding the damage of the vegetable leaves by the rainstorm, and the soil is not easy to harden, with large voids and good ventilation. good.