Northern China is generally hot and dry, with little rainfall and high ground temperatures. In vegetable cultivation, there is no income in water. Therefore, reasonable irrigation of vegetables is particularly important.
According to the type of vegetables, characteristics of irrigation. For cabbages, cabbages, cucumbers, and other roots that are shallow and have a large leaf area, they should always be filled with water, and the principle of noodles should be avoided. For tomatoes, eggplants, legumes and other vegetables, their roots are deep and their leaf area is large, and they should ensure that the seedlings “see dry and wetâ€, and that fast-growing vegetables should be kept clean. Fruit vegetables are prevented from watering during the mother's flowering period (first flowering period). For watermelons, melons, squash, carrots, etc., they should not be dehydrated when sowing or planting.
According to different growth periods irrigation. The seeds need more water during the germination period, and the seeds should be sowed. Aboveground functional leaves and edible organs are in need of water when they are vigorous. Pay attention to irrigation. When the root growth is dominant, it is required that the soil moisture is suitable and the water content is not too high. At the beginning of the flowering period, I was afraid of too much water and I was afraid of being too dry. Edible organs are close to maturity, so as not to delay ripening or cause splitting of the fission balls.
Irrigation according to the shape of the plant. According to the changes in the shape of the leaves and shades of light, stem length, wax thickness, etc., to determine whether to water. Such as open cucumber, if the morning leaves sagging, wilting at noon is serious, difficult to recover in the evening, indicating lack of water, timely irrigation. Tomatoes, carrots and other leaves darken, noon wilting phenomenon; or cabbage, onion leaf color gray blue, surface wax increased, when the leaves crisp and hard water, water should be reasonable.
Irrigation according to soil conditions. Soil moisture is the main factor in determining irrigation. When water shortage occurs, irrigation should be performed in time.
Irrigation can affect the temperature. Therefore, it is necessary to make use of irrigation water to reduce the temperature, so that it can be watered in the morning or in the evening and avoid watering at high temperatures at noon.
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