In the alternate season of summer and autumn, there are more rainy weather, which brings a lot of inconvenience to the greenhouse vegetable production. How to do a good job in greenhouse management has become a craft test.
problem analysis:
The impact of continuous rainy weather in summer and autumn on vegetables is different from that in winter and spring. At this time, the vegetables in the shed are in a high temperature, low light, and high humidity environment. The problems that occur mainly include the following aspects:
Malnutrition. The growth of everything depends on the sun. Photosynthesis is the foundation of crop growth. Under continuous cloudy weather, there is insufficient light, poor photosynthesis, and insufficient organic nutrition in plants. Malnutrition occurs. The specific manifestations are in two aspects: one is deformed fruits, such as cucumber and loofah. The sharp-mouthed melon and the large-headed melon; the hollow fruit of tomatoes. The second is weak plant growth, such as yellow leaves, thin stems, and slow growth of growth points.
The plants are leggy. High temperature, low light environment, vegetables are prone to lengthy growth, leading to long joints, thin leaves, high water content of plants, weak plant resistance, poor differentiation of flower buds, flower drop and fruit drop. This situation mainly occurs in plants that are relatively strong in the early stage and have more nutrient accumulation.
Diseases increase. There are many diseases in high-humidity sheds, such as: cucumber downy mildew, loofah water burnt, tomato late blight, anthracnose, and various bacterial diseases.
Sunburn is common. Under continuous cloudy weather, the plants have weak resistance. After a sunny day, the high temperature and strong light environment can easily burn vegetables, causing symptoms such as dry leaves and wilting.
Mitigation suggestions:
Reduce nutrient consumption and timely supplement plant nutrition. Reasonably retain fruits according to the growth of the plants, and appropriately thin the fruits to reduce plant load. Spray foliar fertilizers, such as Lime, fish protein and other types of full-nutrient or functional fertilizers to quickly supplement nutrients.
Prompt control in time to avoid excessive growth of plants. For plants that are growing vigorously in the early stage, spray potassium dihydrogen phosphate or vigor control agents to control vigor.
Strengthen disease control. Spray pesticides in time according to the occurrence of diseases, especially for the prevention and control of bacterial diseases. If the humidity in the shed is too high, it is not convenient to spray.
Enhance plant resistance to stress. Shade in time after a cloudy day to avoid burns caused by direct sunlight. Spray alginic acid and chitin to improve plant resistance.
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