How to deal with extreme weather in open-air vegetables

August is the flood season in North China. The climate at this stage is characterized by high temperatures and high humidity, heavy rain, or continuous high temperature and drought, and frequent extreme weather, which is not conducive to the normal growth of vegetables exposed in summer. Production trials have shown that when vegetables are exposed to high temperatures above 30°C and humidity above 80%, fertility barriers will be encountered, with high incidence of diseases and insect pests, reduced yields, and poor quality, resulting in lower economic benefits. How to deal with these extreme weather?

One must always listen to the local weather forecast. Before and after the arrival of extreme weather, take targeted precautions and minimize losses. If storms occur before the storm, dig a drainage ditch to prevent the occurrence of disasters. In the case of persistent high-temperature drought, timely irrigation and other irrigation.

Second, we must guard against pests and diseases. Under extreme weather conditions, the disease resistance of vegetable plants will also be greatly reduced. After a heavy rain, the humidity of the air will increase, which may cause a pandemic and spread of the disease. Such as eggplant blight, cucumber powdery mildew, downy mildew, celery spot blight, green pepper wilt and so on. Insect pests such as cotton bollworm, cabbage caterpillar, ground tiger, aphid, and red spider are also prone to occur. Therefore, in addition to strengthening the management of the field and promptly removing the plant residues and insect pests of vegetable plants, it is necessary to regularly spray medicines to prevent diseases and insect pests, and to effectively increase the yield in the later period and increase economic efficiency.

Third, pay attention to the management of fertilizer and prevent premature aging. Most vegetable plants in the high temperature and high humidity environment, their photosynthesis and transpiration intensify, energy consumption increases, the normal metabolic function appears worse, this time to provide vegetables with a better nutritional supply environment, balanced fertilization, do To a reasonable ratio of nitrogen, phosphorus and potassium. Pouring water, applying small fertilizer, water and fertilizer combination. At the same time, foliar spray of micro-fertilizers and plant regulators to protect the root system, extend the functional period of the leaves, and increase the yield at the later stage.