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Reporter Li Qian. Affected by the combination of strong cold air and warm and humid airflow, our city will usher in cold waves, rain and snow and windy weather. In order to prevent problems such as slow growth of vegetables, yellowing of leaves, falling flowers and fruits, and aggravation of diseases, on February 18, agricultural technicians from the Municipal Digital Agriculture and Rural Development Center went deep into the vegetable greenhouses in Huantai County to provide production guidance for farmers.
In the vegetable greenhouse of Maijibang Ecological Park in Huantai County, Zhang Haijuan, senior agronomist of the Municipal Digital Agriculture and Rural Development Center, observed the growth of tomatoes and gave suggestions: "The production and management of vegetables in facilities should be based on microclimate environmental regulation, fertilizer and water management, and pest control, and improve the disease resistance and stress resistance of vegetables by strengthening thermal insulation and heat storage, increasing light, reasonable humidity control and disease prevention, and spraying foliar fertilizer." ”
Zhang Haijuan also suggested that 1-2 days before the cold wave, the plant can be moderately managed by low-temperature exercise to enhance stress resistance, and the temperature during the day and night is about 2 lower than that of normal management, so as to help vegetable crops adapt to the low temperature environment in advance, reduce physiological obstacles such as flower and fruit drop caused by the sudden drop in temperature, and can also be sprayed with foliar sprays3 Potassium phosphate monobasic 03 Calcium nitrate 1 glucose mixture, or suitable concentration of brassinolide and other growth regulators can be induced to resist cold and enhance plant resistance.
Before the arrival of windy weather, the vent should be closed, the shed should be reinforced, the shed film should be compacted, the damaged shed film should be checked and repaired in time, and the electric roller shutter machine, heating and lighting equipment, and circuit should be overhauled to ensure safe and normal operation. Older facilities should be erected with column support and reinforcement.
Before the arrival of rain and snow, the winter greenhouse should be covered with a thermal insulation quilt in time and covered with a layer of plastic film to enhance the thermal insulation effect. Simple middle sheds or small arch sheds can be built in large arch sheds to form "sheds in sheds" to reduce heat loss. Buffer film should be set up at the vent and the door of the greenhouse to improve the cold resistance and heat preservation capacity. In addition, farmers should prepare auxiliary heating equipment such as heaters, electric heaters, and emergency warming blocks in advance to cope with the cold wave. During the heating process, attention should be paid to fire prevention and carbon monoxide poisoning prevention.
When it is cloudy or snowy, farmers can hang reflective curtains on the back wall of the greenhouse or adjust the insulation and cover time to increase the scattered light. Qualified parks can use plant fill lights for artificial lighting, remove the snow in time to prevent damage to the greenhouse, and strictly control the indoor air humidity to prevent diseases by moderate wind and humidity. After the cold wave, rain and snow, due to the weak resistance of the plants, it is recommended to spray carbendazim, chlorothalonil and other low-toxicity and low-residue broad-spectrum fungicides to prevent the occurrence of diseases.