The problem that is most likely to be caused by cloudy days is plant premature decline because of lack of light, low temperature in the greenhouse, poor photosynthesis of vegetables, low organic nutrient production, insufficient supply of nutrients to the plant for long periods, and accelerated aging of roots and leaves. Fine stems, small leaves, yellow leaves, weak growth, low yield, weak resistance to disease.
At present, late autumn vegetables have reached the late growth stage, and wintering vegetables have entered the middle growth stage. How to delay plant aging and increase vegetable production is the focus of winter management. It should start with the causes of premature aging of vegetables and strengthen field management.
First of all, it is recommended that the balance between vegetative growth and reproductive growth should be regulated so as to prevent premature aging caused by excess fruit. High vegetable prices before the Spring Festival, many vegetable farmers in pursuit of short-term high efficiency, leaving too many fruit, too long, resulting in a large amount of nutrients, plants grow slowly, can not see it when the weather is fine, but once encountered cloudy days , it is very prone to premature aging. This is most evident in crops such as eggplants, peppers, and other crops that have more results. It is recommended that growers strengthen the pruning and fruit thinning, reduce the burden on the plants, and avoid planting too many fruits at once.
Second, rational watering and fertilizing. Even in cloudy days, many vegetable farmers have gone to extremes in water and fertilizer management. They do not water for a long time, drought in their sheds, and some of them are over-watered and fertilized, and their roots are seriously damaged. These can easily lead to premature plant failure. It should be said that even when the cloudy days, the transpiration of vegetables is weak and the water requirement is low, but it is not necessary to use water and fertilizer. Instead, because the root activity is weak, it should be adjusted to the optimum humidity. When observing the soil moisture, we should choose 10 centimeters from the surface, where the root system is the largest, which is the key to determine the root absorption. To ensure that the soil is held in groups and spread out in the ground, the range of soil relative humidity that is most suitable for vegetable root absorption is 70%-85%. When drought occurs, it is advisable to pour small water and dry it with water.
Again, care should be taken to avoid overuse of plant growth regulators. In cloudy days, special attention should be paid to avoid excessive use of plant growth regulators to prevent premature aging caused by hormonal intoxication. The flowers and pods are commonly used by vegetable farmers to protect fruits and plants, and the use of plant growth regulators at low temperatures has a high concentration. Long-term and continuous use can easily cause hormonal intoxication, which in turn causes premature plant failure. In addition, some vegetable farmers to control the prosperous vegetables, habits such as spraying paclobutrazol, chlormequat, help Zhuang prime and other control, in the winter is extremely prone to injury. For plants that develop hormonal intoxication, they can be sprayed with 600 times more protective agents or cytokinins and 6,000 times more for love.
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