Key points of management of greenhouse vegetables after summer

After May Day, the temperature picked up obviously, and compared with spring, the management of vegetables in the greenhouse should also be changed. At present, vegetables in the greenhouse focus on the following three points:

1. Prevent the harm of high temperature and bright light. If the vegetables in the shed are in the environment of high temperature and strong light for a long time, it is easy to cause high temperature barrier and strong light. For example, cucumber is prone to stem wilting due to excessive leaf transpiration and reduced ability of root water absorption and water supply; tomato fruit is prone to navel rot due to high temperature and drought; sweet pepper fruit is prone to sunburn. Kidney beans drop flowers and pods due to high temperature. In short, vegetable farmers should beware of the harm of high temperature and bright light to vegetables in the greenhouse. Effective measures such as covering sunshade net, splashing mud or ink, spraying cooling agent and so on. In addition, under this condition, it is easy to cause overgrowth of plants because the temperature difference between day and night is too small. It is suggested that vegetable farmers spray 1500 times more to adjust.

two。 Prevent diseases and pests. With the increase of temperature in the greenhouse, the diseases such as Botrytis cinerea, Sclerotinia sclerotiorum and cotton rot which are suitable for low temperature and high humidity gradually decreased, but leaf mold, powdery mildew and bacterial diseases began to occur. Vegetable farmers need to be reminded that vegetable virus diseases that are easy to occur in high temperature and drought conditions should be prevented. It is suggested that spraying chlorothalonil and streptomycin 3000 times once every 7 days, controlling powdery mildew and leaf mildew of melons and eggplant fruits can be 1500 times, and virus A500times + Ningnanmycin 300times + zinc leaf fertilizer can effectively passivate and inhibit the occurrence and epidemic of virus diseases. In view of insect pests, it is suggested that vegetable farmers should focus on the control of whitefly, thrips and mites. In addition to physical and biological control methods, Caixi, imidacloprid, pyridaben, avermectin and other pesticides can be selected to control.

3. Prevent drug damage and fat damage. Vegetable crops are under high temperature and strong light, and their metabolism is strengthened. If the multiple of spraying or dipping in anther is still diluted in winter, or the amount of fertilizer spraying is too large, it is very easy to cause leaf drug damage, hormone poisoning or root injury. Here, vegetable farmers are advised to be cautious in the use of drugs, especially dipped in anthers or plant growth regulators with the effect of controlling growth. When irrigating fertilizer, pay attention to balanced fertilization, formula fertilization, such as cucumbers in the peak fruiting period, it is recommended to apply fragrant run (20:20:20) 8 Mel 10 kg / mu, attack melons and raise vines. Foliar topdressing is mainly composed of boron, calcium, magnesium and other trace elements.