How can the use of shading or reflective materials reduce evapotranspiration rates and decrease irrigation water demand in greenhouse environments?

In greenhouse environments, controlling evapotranspiration (ET) – the combination of water evaporating from the soil and transpiring from plants – is essential for optimizing water use and plant health. Shading and reflective materials are effective tools for reducing ET rates and thus decreasing irrigation water demand. They achieve this primarily by managing solar radiation and temperature within the greenhouse. Shading Materials: Shading materials reduce the amount of solar radiation entering the greenhouse. This directly lowers the temperature of the air, soil, and plant surfaces. Since ET is strongly influenced by temperature, a lower temperature translates to a reduced ET rate. Several types of shading materials are used: a. Shade Cloth: Shade cloth is a woven fabric that is installed over or inside the greenhouse. Different shade cloth densities are available, ranging from 30% to 90% shade, allowing growers to select the appropri....