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The role of greenhouse shading and covering.
2020-09-15
(1) Shading effect: The shading net reduces the light intensity in the greenhouse. The larger the density specification, the better the shading. The same specification black is better than silver gray.
(2) Cooling effect: The temperature in the shed has decreased due to the shading net coverage, and the cooling rate of the ground 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℃, and the temperature around the surface plants is 22─26℃, the soil temperature is between 18─22℃, suitable for crop growth.
(2) Cooling effect: The temperature in the shed has decreased due to the shading net coverage, and the cooling rate of the ground 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℃, and the temperature around the surface plants is 22─26℃, the soil temperature is between 18─22℃, suitable for crop growth.
(3) Moisture protection and rainstorm prevention: The evaporation in the shed is reduced, the soil water content is higher than that of the open field, and the topsoil is moist. Because the sunshade net has mechanical strength and is denser, it can decompose the rainstorm into drizzle, avoid the vegetable leaves from being damaged by the rainstorm, and the soil is not easy to compact, with large voids and good air permeability. The sunshade net is covered with plastic film in the greenhouse. it is good.
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