Generally speaking, crops are not very cold-tolerant. In the cold winter, they are vulnerable to freezing damage and cause economic losses to farmers. What are the technical measures for winter crops to prevent cold and freeze?

Technical measures for cold and disaster reduction of vegetables

Reinforce the greenhouse, remove the snow and prevent collapse

In recent years, greenhouse ction has developed rapidly, but the bamboo sheds still occupy the main body. The sheds should be reinforced according to the quality of the sheds in their greenhouses to improve the ability to withstａnd pressure. When ice and snow come, snow should be removed to remove snow from the roof. 

According to the situation, do a good job in the management and disposal of the vegetables in the open field

1. Lettuce that has been swelled and broccoli that has been basically harvested should be in the morning market (frozen at -1 °C).

2. For the broccoli that has been budded, first cover the flower bud with an old leaf, and then bundle the outer leaves into bundles.

3. For cold-tolerant vegetables such as lettuce seedlings, spinach, coriander, and rapeseed, choose 2-3 times of anti-cold antifreeze on cloudy or sunny days.

4. The radish should be strengthened.

5. Conditional producers can put a film or shade net on the vegetables to prevent freezing.

Strengthening the management of greenhouse foods in greenhouses

The sheds are mainly cold-tolerant autumn and winter vegetables. It is recommended to use the following measures.

1. Sunny and cloudy, open the shed door, mainly for dehumidification.

2. Rain and snow days, close the greenhouse door, insulation.

3. At night, close the shed door and keep warm.

4. Prevention and treatment of diseases: The disease is mainly gray mold, early blight, insects only aphids and white meal. Choose sunny or cloudy morning, spray enemy force (propiconazole), quick kingling (Pythium) and other agents to prevent disease; spray imidacloprid or Beauveria bassiana to control aphids or 1+1 Bacillus thuringiensis to control aphids or whitefly.

Carefully cope with the ction of wintering seedlings of solanaceous vegetables. The following management measures are recommended:

1. It is necessary to cover the shed at night, and the small shed is covered with a small arch shed film. However, the small shed should open a vent every 10 meters on both sides, which is conducive to dehumidification and disease prevention.

2. When the temperature in the shed is higher than 5 °C, the small shed film will be uncovered throughout the day; when the temperature in the shed is higher than 15 °C, the two doors of the shed will be ventilated; when the temperature in the shed is between 0 °C and 4 °C, small The shed film was exposed for 1-3 hours at noon.

3. When the temperature is below 0 °C, select the small shed film for 30 minutes to 1 hour at noon during the day, and close the shed film for the rest of the day, but open the vents on both sides.

4. When the temperature is lower than 0 °C, conditional producers can set up air heating lines in the small arch shed, each 1-2 meters wide and 30 meters long seedbed, with a 1000W air heating line, energized Warm up for 5-10 hours (every night). If the geothermal line of the laid geothermal line is turned on, the heating line is energized and heated.

5. Remove snow from the shed, and drain the ditch around the shed in time to prevent snow from seeping into the seedbed.

Second, citrus cold and disaster reduction technical measures

1. Timely rescue of frozen cracks. After the snow melts on the tree, the torn trunk is quickly returned to the original growth site, and the crack is tied with a rope, and then wrapped with a film tape about 2 cm wide.

2. Covered by smoke. In order to prevent the snow from worsening, at 5-8 o'clock in the morning or at night, use orange branches, fallen leaves, sawdust chips, crop stalks, etc. to make smoke piles, ignite smoke, and set 2 to 3 piles per acre of orange garden to make the smog Orange garden to reduce frost damage. For newly planted young trees, it is best to cover the canopy with a film or straw scaffold to increase the temperature inside the canopy.

3. Timely classification and pruning. After 7-10 days after snow, the frozen branches are easily identified and trimmed, and the dead branches and diseased branches are cut off, and the survival branches and residual leaves are kept as much as possible. A fractional pruning that is difficult to distinguish at a time. When trimming, the cut should be smooth, and a large amount of protective agent such as sulphur sulphur is applied at the large cut to reduce evaporation of water.

4. Timely fertilization promotes spring shoots. After the freezing damage, it is necessary to fertilize the soil in time, and apply 50-100 grams of urea per plant, apply once every 7-10 days, and apply 3-5 times to promote new shoots and restore the tree potential.

5. Strengthen pest control. After citrus freeze damage, it is necessary to attach great importance to the prevention and treatment of resin disease, sunburn and leaf miner. Once the condition occurs, the trunk should be drawn longitudinally and the crack should be applied with 100 times of thiophanate or carbendazim. After the spring shoots are taken out, the occurrence of pests such as the leaf miner should be prevented in time.

Zhengzhou Delong Chemical CO., Ltd. is the production base of plant growth regulators in China, which established in 2009, specializing in offering plant protection products. If you have any question, contact us any time.