Whether or not the number of times of watering and the amount of watering in winter greenhouse vegetables is appropriate has a great influence on the growth rate, yield, and benefits of vegetables. In winter and spring, the temperature is low and the water temperature is low. Even the temperature of the well water that has just been extracted is only about 10°C. After each watering, the ground temperature will be greatly reduced, which will not only lead to the normal growth of the sheds for several days, but will also induce gray mold, downy mildew, leaf mold, etc. due to increased humidity in the shed after watering. The occurrence of a variety of hi wet diseases, thereby increasing the cost of prevention and labor, 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 does not help improve the ground temperature, but also easily lead to the deterioration of soil permeability, resulting in root oxygen deficiency, reduce the vitality of the roots, resulting in roots, the phenomenon of yellow leaves.
3, look at 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 Diseases occur frequently, and deep winter seasons require special 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, and the plants should be returned to normal water again.
4, see the temperature. The average daily temperature of vegetables is about 22°C. In deep winter season, the temperature in greenhouses is usually between 15°C and 20°C. If the watering is excessive or the watering time is not right, the ground temperature will drop rapidly, causing root injury and endangering the environment. Plant growth above the ground. Therefore, watering at a low temperature is preferably performed after the grass is opened in the morning.
Second and second measures
1, 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, water storage warming. The so-called water storage and warming is to build a reservoir in the greenhouse, first raise the temperature of the water through the reservoir and then water the vegetables. This method is simple, practical and effective. The disadvantage is that it takes up some space in the shed.
Three, five attention
1, moderate watering. Spring watering of Boron vegetables is generally based on the principle of no shortage of water, no drying, and no wetness. The soil moisture content in the rhizosphere of the crop is maintained at about 60%, so as to prevent excessive watering and excessive flooding. Excessive watering can easily reduce the temperature in the shed and the soil temperature, which is detrimental to crop growth.
2, 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 greenhouse from spreading. In particular, tomato gray mold, cucumber downy mildew can easily occur under high temperature and high humidity conditions.
3, small water pouring. Spring shed vegetables are 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 increasing significantly, thus suppressing the occurrence of a large number of pests and diseases.
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. It is better to use deep well water with higher water temperature, or pre-storage of water in the shed. With pre-storage water irrigation, a storage tank can be built in the shed to store water in advance within 1 to 2 days before watering. The greenhouse temperature can be used for warming, and when the water is poured, the greenhouse temperature and ground temperature can be prevented from falling.
5, under the film dark irrigation. For melons, eggplants, legumes and other spring shed vegetables, cultivation techniques should be used to cover the cultivation of plastic film, irrigation under the use of under-membrane irrigation, can use film heating water temperature, ground temperature, and inhibit excessive evaporation of water to prevent the humidity inside the greenhouse Too large to prevent the spread of pests and diseases.
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