In winter and spring, the temperature is low and the water temperature is low. After each watering, the temperature will drop significantly. This not only results in the normal growth of the sheds for several days, but also induces gray mold due to increased humidity in the shed after watering. Downy mildew, leaf mold and other kinds of hi wet disease, which directly affect the yield, quality and efficiency of vegetables. So, how can watering achieve the best results? Specific should do the following:

First, look first

1, see growth. Seeing the growth of plants, when the plants are usually deficient in water, the leaves will wilt, the growth will weaken, and the occurrence of fruit umbilical rot will be more, then the water should be added in time.

2, see the lyrics. To see the soil moisture, if the greenhouse is not watered when the soil is not dry, not only is not conducive to raising the temperature, but also easily lead to deterioration of soil permeability, resulting in lack of oxygen in the roots, resulting in roots, the phenomenon of yellow leaves.

3, look at the weather. Be sure to watch the weather forecast before watering. You must not only choose sunny watering, but also ensure that there is 2-3 days of sunny days after watering to avoid rainy weather after watering, resulting in increased humidity in the shed and lower ground temperature. Diseases occur frequently, and deep winter seasons require more attention. In the first two days after sunny days, it is also not suitable for watering. The temperature of the shed should be raised first to allow the plants to return to normal and water again.

4, see the temperature. The average daily soil temperature for vegetables growing is about 22°C. In the deep winter season, the temperature in the greenhouse is usually 15°C -20°C. If the watering is excessive or the watering time is not right, the ground temperature will drop rapidly, causing root injury. It threatens the growth of the plant's aboveground parts. Therefore, watering at low temperatures is best performed after pulling the grass in the morning.

Second, then pay attention

1, pay attention to cover the film. Covering the mulching film can not only reduce the evaporation of ground water, maintain soil moisture, reduce air humidity, reduce the occurrence of diseases, but also increase the temperature of the ground and speed up the growth of vegetables.

2, pay attention to moderate watering. Watering vegetables in winter and spring greenhouses generally follows the principle of no shortage of water, no drying, no drying, and no moisture. Maintain soil moisture content in the rhizosphere of crops at about 60%, prevent excessive watering, and avoid flooding. Excessive watering tends to reduce the temperature in the shed, soil temperature, and adversely affect crop growth. In winter and spring, shed vegetables should be poured with small water, or watered by pots, which can basically meet the needs of crop growth, and can prevent the temperature in the shed from falling significantly, and the humidity can increase significantly, thus suppressing the occurrence of a large number of pests and diseases.

3, pay attention to timely watering. When the vegetables appear wilting and the tendrils do not stretch properly, it means that the water is short of water and should be watered in time. Watering should be done before and after noon on sunny days. After pouring, proper ventilation should be used to prevent the humidity in the shed from being excessively large, causing the spread of pests and diseases. In particular, tomato gray mold, cucumber downy mildew can easily occur under high temperature and high humidity conditions.

4, pay attention to regulate water temperature. When the water temperature differs from the temperature in the shed by more than 5°C, root damage is easily caused. Deep well water with high water temperature, or pre-storage irrigation in the shed is better.

5, pay attention to the dark irrigation under the membrane. For sheds such as melons, solanes, beans, etc., cultivation should be covered with mulching. Under irrigation, under-membrane irrigation can be used. The mulching film can be used to heat the water temperature and the ground temperature, and suppress the excessive evaporation of moisture to prevent excessive humidity in the shed. To prevent the spread of pests and diseases.

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