After Lidong, frequent cold air activities across the country will have a great impact on vegetable production. Vegetable production is relatively "fragile". Sudden cooling, frost, heavy rain and other disasters often lead to the annihilation of vegetables in simple sheds in one season. In the face of various disasters, how can we plan ahead and reduce losses? Now bring some countermeasures and successful experience of the production line to provide reference for growers.

1. The key points of the management of cooling and frost prevention and control

According to the weather forecast, before the arrival of temperature drop or late frost, if the cold shed and open field vegetables have not been planted, the vegetable seedlings shall be centralized to increase the temperature and the planting shall be postponed for 1 to 2 days. For fruit and leafy vegetables that have been planted in the shed, water and fertilize temporarily. Erection of straw curtains. Conditional vegetable growers can temporarily erect 1.2-meter-high grass curtains around the shed, and set up two-membrane, three-membrane or mulch film for heat preservation. Increase the temperature in the shed. If the temperature drops below 0°C suddenly, you need to ignite the heating block in the shed in advance, which can quickly increase the temperature in the shed by 3 to 5°C and keep it for 2 to 4 hours. The heating block is generally ignited at 3:00 in the morning when the night temperature begins to drop, and 3 to 5 blocks per acre are ignited according to the heating demand. Spray the potion. Foliar sprays of biostimulants such as amino acid + humic acid can enhance the cold-resistant activity of the leaf surface.

Treatment measures

After the weather is clear, open the air outlet of the greenhouse in time and adopt low temperature management to avoid tissue damage caused by excessive temperature changes.

Immediately spray the integrated amino acid magnesium calcium water solution (amino acid content 180g/L, calcium 20g/L, magnesium 10g/L) 600 times solution to the vegetables, 30～45L per mu, and then spray again after 5 days . Spraying highly active free amino acids is beneficial to the recovery of leaf cell tissues and alleviates freezing damage.

2. Look here for measures to prevent waterlogging of vegetables in the shed

Precaution

Pay attention to the weather forecast at any time, and prepare for flood drainage in advance if there is a rainstorm warning.

Using deep loosening + deep turning technology. Before winter, use a rotary tiller to deep loose the soil more than 40 cm to form a "rat passage" drainage ditch at the bottom of the deep plough. Dig drainage ditches in advance, prepare generators, pumps, drainage pipes and other drainage equipment.

The shed film is deeply buried and bent and pressed. When the shed film is pressed, leave an extra 50 cm of the empty film, dig a trench to bury 40 cm deep, and then spread the shed film 10 cm upwards after the trench reaches the bottom, and finally fill it with soil compaction. This can prevent rainstorm water from flushing through the bottom of the shed film to enter the shed. Pay attention to check whether the shed film or scaffolding is broken or cracked at any time, and repair it in advance.

Prevent disease. After planting, irrigate once with 400 times solution of 68% metalaxyl·manganese-zinc water dispersible granules to prevent stem base rot and Phytophthora root rot, block the ground and block soil transmission, and prevent diseases caused by standing water after rain . This is also one of the steps of the technical plan for the health protection of facility vegetables.

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