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High-temperature light is the biggest killer of summer vegetable production. If there are many hot weather in summer, if it is not possible to take effective measures to lower the temperature in the greenhouse, the vegetables will prone to prolonged growth, wilting, sunburn, and drop and fruit drop under high temperatures. Therefore, we must do the following: First, we must strengthen ventilation. Under normal circumstances, solanaceous vegetables should be controlled in the temperature of 25-30 °C during the day, the temperature should be controlled at 15-16 °C at night; melon vegetables should be controlled at 26-32 °C during the day, at night should be controlled at 15- 18 °C. When the temperature in the shed exceeds 35°C, the shade net should be installed on the roof to reduce the temperature. If the temperature exceeds 18°C ​​during the night, measures should be taken to cool the temperature down to increase the temperature difference between day and night to ensure the normal growth of vegetables.
Heavy rain is the second biggest killer of summer vegetable production. Heavy rainstorms in summer often collapse the wall, especially after the rainwater is poured into the shed, which can easily cause soil damage, resulting in root injury or root disease, and affecting the growth of vegetables. Therefore, after entering the flood season in summer, you should listen to the weather forecast in time, and use a plastic sheet to protect the wall before the rainstorm to prevent the infiltration of rainwater. The drainage ditch around the shed shall be dredged in time to prevent rainwater from pouring into the shed. If due to unfavorable protective measures, rainwater is poured into the shed, and the water in the shed must be quickly removed with a pump. When the soil is dry and wet, the cultivator will be cultivated in time to increase the permeability of the soil and promote the growth and development of the vegetable roots.
The phytotoxicity that often occurs at high temperatures is the third largest killer of summer vegetable production. Most of the pharmaceuticals are greatly affected by temperature, generally the higher the temperature, the penetration, the stronger the stimulation of the stems and leaves of vegetables. Therefore, in the summer when spraying vegetables, we must master the concentration. First of all, read the instructions carefully before use. Generally, the concentration of the drug should be slightly lower than that indicated on the instructions. For example, the use concentration of the auxiliaries is 800 times. It should be reduced to 1000 times when used in summer to prevent phytotoxicity from occurring at high temperatures. Second, we must pay attention to the time of spraying. In general summer spraying should be selected before 9 o'clock in the morning or after 4 o'clock in the afternoon. Generally, it is not sprayed at noon on a sunny day. This is the time most likely to cause phytotoxicity. In addition, the flowering period of vegetables should be as low as possible spraying or not spraying, it is necessary to have a good grasp of drug concentration when spraying. Once phytotoxicity occurs, effective measures should be taken to remedy the situation in time. The remedial measures include: First, spray water rinsing. When vegetables suffer from phytotoxicity, promptly rinse the leaves with clean water. According to the characteristics of most pesticides decomposed by alkali, add 0.2% alkali or 0.5% lime water to the clean water; . If the vegetables are inhibited too much by Chlorella, they can be sprayed with 0.05% gibberellin. The third is to strengthen the management of fertilizer and water. After the occurrence of phytotoxicity, vegetables should be quickly watered once to increase the water supply of the plants, to dilute the concentration of the liquid in the plants, and to apply nitrogen, phosphorus, and potassium compound fertilizers with water to promote the root system. Growth and development, increase the resistance of vegetables, so that the damaged vegetables recover as soon as possible. Fourth, after the occurrence of phytotoxicity, it can be sprayed with 6,000-fold higher dose or 500-fold higher number of nucleotides or a mixture of the two to spray and reduce the injury.
Poisoning pests are the fourth killer of summer vegetable production. Summer is the season when aphids, aphids, leafhoppers and whiteflies breed in large numbers. After such insects infiltrate into a shed, they will not only directly harm the growth of vegetables, but also spread viral diseases. Therefore, comprehensive measures should be taken to prevent such pests from infiltrating into the shed. If the insect nets can be set at the air outlet of the greenhouse, the specifications of the insect nets should be selected to be above 20 mesh, which can basically prevent the intrusion of the above pests. For pests that infiltrate into the shed, they can hang yellow traps in the sheds. Can be used 3% of acetamiprid 1500 times mixed 10% imidacloprid WP 2000 times. In addition, timely removal of weeds and other insect pests outside the shed is also an important measure to prevent the occurrence of such pests and virus diseases.
To guard against the four “killers†of greenhouse vegetables in summer
Summer heat, high temperature, such as improper management, vegetables often appear wilting, sunburn, poor growth and other phenomena, and there are many factors that cause the above phenomenon, here, let us call these unfavorable factors on vegetables called "vegetables Killer." If vegetable growers cannot effectively prevent these “killers†in the production and management of summer vegetables, it will affect the increase in the yield and quality of vegetables, which will in turn affect the economic benefits of vegetable farmers. Therefore, vigilance should be particularly heightened.