Greenhouse vegetable watering tips
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1. Take a dark irrigated film between the ridges. Generally, the method of wide and narrow mulching cultivation can be adopted, the wide row spacing is 80 cm, the narrow row spacing is 50 cm, the ridge height is 10-15 cm, and a row of seedlings is planted per ridge. The two adjacent ridges are covered with a mulch film, and the mulch film or the dried straw, wheat straw and the like are covered at the same time between the wide rows. According to the measurement, the use of submerged membrane dark irrigation can increase the ground temperature by about 5 °C, reduce the air humidity by 9% to 10%, and reduce the disease by more than 30%.
2. Master the appropriate number of watering and watering. According to the type of vegetables and the growth period, flexibly control the appropriate number of watering and watering. At low temperatures, the vegetables in the shed evaporate slowly, and the water demand is reduced accordingly. Therefore, the watering amount should be small, and the interval time should be longer. Avoid flooding with large water. It should be watered or sprayed to avoid the low temperature and high humidity leading to vegetable roots. In the first two days after watering, it is easy to cause the humidity in the shed to increase. Pay attention to reasonable ventilation and humidity to prevent disease. Ventilation is generally preferred when the temperature is high at noon. When the seedlings are planted, the seedling water should be poured; in the low-temperature season, the vegetable should be controlled to water the appropriate amount; when the first fruits of the fruit and vegetables begin to expand, the irrigation volume should be gradually increased; the result should always maintain sufficient water, the shed The soil moisture content within the soil cannot be less than 20%.
3, watering time should be appropriate. Watering should be arranged around noon, just before 3 pm after 3 am, the shed temperature is higher during this period, and the side effects are minimal after watering. Avoid watering in the morning and evening to prevent freezing damage to vegetables. Well water should be used as much as possible for watering. Due to the higher temperature of well water, physiological stimulation of vegetables can be reduced.
4, see the sky flexible watering. According to the weather conditions, master the principle of “appropriately watering on sunny days, less pouring or not pouring on cloudy days, and avoiding watering in wind and snowâ€. When the weather turns from sunny to cloudy, the amount of water should be gradually reduced, and the interval should be appropriately lengthened. When the weather turns from cloudy to sunny, the amount of water should be from small to large, and the interval should be shortened from long to long. It is best to combine watering and fertilization, and ventilate and ventilate in time after watering and fertilizing.
5, watering different parts of the shed to be different. The temperature of each part of the greenhouse is quite different, and the amount of watering must be different. For example, in the southern end of the greenhouse and near the heating source such as heating stoves and flue, the evaporation of soil moisture should be larger, and the watering amount should be larger; the temperature on the east and west sides of the greenhouse is lower, the sunshine time is short, and the watering amount is Should be less appropriate.
Author: Chen Maochun
Source of information: Shandong Science and Technology News