This summer, there are more hot and rainy weather in the northern regions. High-temperature and high-humidity are two important environmental factors that restrict the normal growth of vegetables in summer. This can easily cause roots, leggy and other undesirable phenomena in vegetables, and also create conditions for the invasion and occurrence of diseases and insect pests. Humidity effects: Under high humidity conditions, vegetable plants are in a state of moisture saturation and prone to leggy. Especially eggplant vegetables and melon vegetables are particularly evident. After a prolonged growth of vegetable crops, cell walls become thinner, and the stress resistance of various organs of vegetable plants declines, and they are vulnerable to high-temperature hazards, causing high-temperature burning of cell tissue and causing sunburn (high-temperature light burns young tissues, Sunburn on the fruit not only affects the growth of the plant, but also affects the yield. The moisture in the soil is in a state of saturation for a long period of time, which makes it easy for the root system to be in an oxygen-deficient state, resulting in rooting of the roots and infestation of soil-borne diseases, leading to the emergence of "dead trees." Temperature management: The continuous high temperature weather and continuous rainy weather appearing in the middle of the year pose a great threat to the vegetable seedlings cultivated in autumn. Continuous high temperature weather not only affects the normal growth of seedlings, causes abnormal growth conditions such as wilting and growth stagnation at the growing point, and high temperature conditions easily affect the flower bud differentiation of seedlings, resulting in a higher percentage of early flowering, fruit drop, and malformed fruits. Pre-production is greatly reduced. The management of major vegetables: Solanaceous vegetables: Solanaceous vegetables are prone to leggy and seedling disease (flood damping, blight and stem rot) under high temperature and high humidity conditions. In the course of management, control of temperature and water should be done, and attention should be paid to good shade nets and insect nets. After planting, pay attention to control the amount of watering, watering to do a small water pouring, see dry see wet, to prevent excessive humidity, infection seedling disease. In the event of seedling stage disease, it can be treated with 500 mg of hymexazol or 600 times of root rot, 600 times root liquid, rooting strong seedlings, or harvesting No.1; it can also be treated by flushing and preventing disease type Jianzhibao. 40 to 60 kg. The management of melons and vegetables during this period is mainly to control growth and increase production. In the management process, attention is paid to temperature control and water control to prevent melons from appearing prosperous and resulting in melons under conditions of high temperature and high humidity. At night, night temperature control should be strengthened, ventilation should be increased, and nutrient conversion and transportation should be strengthened. When fertilizers are applied, pay attention to potash fertilizer and increase yield. Open-air cultivation of leafy vegetables should be protected against rain and timely harvesting. During the period of concentrated rainfall, attention should be paid to flood prevention and flood prevention to prevent water accumulation and root cause. When harvesting standards are met, timely harvesting is needed to prevent rain rot and reduce commodity value.
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