Reasonable watering is an important measure to ensure the robust growth of greenhouse vegetables and increase production. For the problems of low temperature in Winter and high humidity in greenhouses, the following items should be noted when watering greenhouse vegetables:
1. Pay attention to 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 pay attention to public opinion. To see the soil moisture, if the greenhouse soil is not watering when it is not dry, it is not only unfavorable to increase the ground temperature, but also easily leads to the deterioration of the soil permeability, resulting in the lack of oxygen in the roots, resulting in roots and yellow leaves.
3. Pay attention to the weather. Be sure to watch the weather forecast before watering, not only to choose sunny watering, but also to ensure that there are 2 to 3 days of sunny days after watering, in order to avoid the rainy weather encountered after watering, resulting in increased humidity within the greenhouse, lower ground temperature Many diseases occur. In the winter season, it is necessary to pay attention to the fact that in the first two days after the sunny day, it is not suitable for watering. The temperature of the shed should be raised first, and the plants should be returned to normal water again.
4. Pay attention to the temperature. The average daily soil temperature for vegetables growing is about 22°C. In the deep winter season, the ground temperature in the shed is often 15°C to 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 grasshoppers in the morning.
5. Note the cover film. Covering the plastic film can not only reduce the evaporation of ground water, maintain soil moisture, reduce the number of watering, reduce air humidity, reduce the occurrence of diseases, but also increase the temperature and speed up the growth of vegetables.
6. Pay attention to moderate watering. In winter and Spring greenhouse vegetable watering, generally follow the principle of no shortage of water, rather dry, not wet, to maintain the soil moisture content of vegetables in the rhizosphere about 60%, to prevent excessive frequency of watering, avoid flooding irrigation. Over-watering tends to lower the temperature and soil temperature inside the shed, which is detrimental to the growth of vegetables. Use a small amount of ground water, or pour with a water bottle.
7. Pay attention to regulating 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.
8. Pay attention to management after watering. In the first two days after the winter watering, the temperature should be raised to about 40°C at noon first, and the shed should be raised for 1 hour to increase the temperature in the shed. Then increase the ventilation and reduce the humidity in the booth. Again for the easy incidence of vegetables, spray prevention to reduce the occurrence of pests and diseases.
Ningbo Staneex Imp. & Exp. Co., Ltd. , https://www.staneex.com