Due to the low temperature in winter and spring, after watering, the ground temperature will be greatly reduced, not only affect the normal growth of shed vegetables, but also cause various humidity hazards such as gray mold due to increased humidity in the shed after watering. This will affect the yield, quality and benefits of vegetables. How to water scientifically? A brief introduction is as follows:
First, "Three Looks" Before Watering
1, see growth. When the plants are usually deficient in water, the leaves will be wilting, the growth will be weakened, and the occurrence of fruit umbilical rot will be more. In this case, the water shall be added in time.
2, see the weather. Be sure to watch the weather forecast before watering, not only to choose sunny watering, but also to ensure that there is 2-3 days of sunny days after watering.
3, see the temperature. In winter greenhouses, the temperature in the interior is usually between 10°C and 20°C, and the ground temperature is not suitable for watering. Otherwise, the ground temperature will drop even more, causing root injury and endangering the growth of vegetables.
Second, water should be done "five attention"
1, moderate watering. Watering vegetables in winter generally follow the principle of no shortage of water, never dry, never wet, to maintain soil water content in the rhizosphere about 60%, should not flood irrigation.
2, timely watering. It is better to choose the morning of a sunny day. At this time, the water temperature is close to the ground temperature. After the watering, the root system is stimulated and easy to adapt. At the same time, the ground temperature recovers quickly, and there is enough time to eliminate the humidity in the greenhouse. Watering in the afternoon will cause a sudden change in the ground temperature and affect the physiological function of the root system.
3, small water pouring. Spring shed dishes should be poured with a small amount of ground water, and the water should be poured one by one to meet the needs of vegetable growth.
4, pay attention to the water temperature. When the water temperature differs from the temperature in the shed by more than 5°C, root damage is easily caused, and irrigation with deep well water with high water temperature is preferable.
5, under the film dark irrigation. For melons, eggplants and other winter and spring vegetables, cultivation techniques should be used to cover the cultivation of plastic film, the use of under-membrane irrigation, conditions can be implemented under the membrane irrigation. This can effectively prevent the ground water from evaporating, reduce the humidity in the greenhouse, and prevent the occurrence of diseases.
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