The greenhouse vegetable grows slowly and consumes little water in winter, and the phrase “the vegetable in the greenhouse can be watered for a hundred days in winter†was accepted by the farmers. So, in the end, winter greenhouse vegetables need not to be watered. How much water should be poured? How to pour? According to his many years of research experience, Zou Zhirong, a professor at the College of Horticulture, Northwest Agriculture and Forestry University, summed up the principle of “five-to-five and five-not-to-use†watering winter greenhouses.
Do not cast cloudy
Zou Zhirong said, “Impressing the water without dripping with dripping water†means watering on sunny days and not watering on cloudy days. The specific time should be chosen according to different weather conditions. Strict observance of watering on sunny days, little or no pouring on cloudy days, rain and snow Avoid the principle of watering, especially in cold weather and cloudy snow weather, should avoid watering during this period as much as possible, so as to avoid the ground temperature caused by falling vegetable roots, or cause the air humidity in the shed to increase, resulting in the occurrence of disease And spread.
Before pouring, do not pour
“After noon, the water temperature will recover quickly and there will be enough time to exclude the moisture in the shed. No watering at noon, so as not to affect the physiological function of the roots at high temperatures, it should not water in the evening.†Zou Zhirong said, most of the farmers Watering after 10 a.m. is very inappropriate, because when the weather is fine, the temperature of the shed will rise fastest after 9 am, and the temperature of the shed will reach 25°C at 10 o'clock. At this time, the ground temperature is not low. At 20°C. If this time watering, water temperature and ground temperature difference is too large, it is easy to cause rooting, dead tree phenomenon. Zou Zhirong said: “When the greenhouse has been opened in the morning, the greenhouse temperature is between 13°C and 15°C, and the ground temperature is between 10°C and 12°C. Selecting this time for watering is not likely to cause root damage after watering.â€
Do not pour
In winter, the temperature is low, and the water requirement of vegetables is also small. Therefore, the number of watering and the amount of watering should be small, and flood irrigation should not be performed. According to Zou Zhirong, under normal circumstances, it is a small row of intervening water, and the maximum amount of watering is only half of summer. “For instance, cucumbers can be used for wintering, watering twice for small rows, watering large rows once, and rotating irrigation. At the same time can also reduce the impact of water on the ground temperature." Zou Zhirong said.
Pouring temperature does not leave to cool
Zou Zhirong said that water for irrigation must first be warmed up in the shed, and then poured when the water temperature is close to the ground temperature. The water temperature should not be lower than 12°C. It is not possible to directly use cold water in rivers, reservoirs, and ponds. After watering is completed, the ventilation openings should be closed or closed so that the temperature in the greenhouse can reach 32°C or more, and it can last for 1 to 3 hours.
Do not cast
Winter greenhouse vegetables should adhere to the dark irrigation under the membrane, or micro-irrigation under the membrane, which can effectively prevent evaporation of ground water, reduce the air humidity inside the greenhouse, and prevent diseases. The use of micro-irrigation has a positive effect on the balance and coordination of water, fertilizer, gas, and heat required for the growth of vegetables, especially in the early and mid-term.
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