Vegetables are water vegetables and their water content is above 95%. In the hot summer, there is a saying that “three days a small drought, five days a drought†in vegetable production. In summer temperatures above 35°C, the temperature will be higher at noon under sunlight. The heat generated by sunlight on the ground has a direct effect on the root growth of the crop. How to reduce the temperature, especially the ground temperature, is particularly important for improving the yield and quality of vegetables. In open field production, watering time is appropriate in the early morning or evening. After the temperature is lowered, the water is poured to reduce the damage to the root system of the crop caused by the low temperature of the pouring well. In solar greenhouses and large arch sheds, watering can be performed in the intervening or guttering to reduce the amount of watering and increase the number of watering. The purpose is to meet the needs of crop growth for moisture, while increasing the air humidity inside the shed, lowering the shed temperature. Combination of watering and topdressing, using flushing and fertilizing with water application, the relative amount should be reduced, and water and fertilizer should be adopted, that is, pouring water once, and then pouring water with fertilizer to promote growth and delay aging.
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