There are 6 ways to prevent
Follow the weather forecast. Pay attention to listening to and understand the weather forecast. If the forecast has a large area of ​​temperature drop, take precautions in advance.
Increase the application of organic fertilizers. Quickly apply a thin layer of soil manure, human and animal manure or rice chaff to those who have not applied wax fertilizer to help keep warm, enhance the cold resistance of plants, and prevent frost damage.
Cover to protect against cold. Cover the rapeseed rows with straw, chaff or other crop stalks to keep warm, which can reduce the direct attack of cold wind. You can also sprinkle a layer of chaff ash, plant ash, fire soil ash, etc. on the surface of the rape leaves before the cold wave arrives to prevent the leaves from freezing.
Irrigate to prevent freezing. Before freezing or severe cold comes, timely watering the rape field can avoid a large drop in ground temperature and alleviate the degree of freezing damage, especially for preventing drying and freezing. After irrigation, the root system is tightly integrated with the soil, which is beneficial to the absorption of water and nutrients by rape. After freezing, the ditch should be cleared and drained in time to avoid root damage due to water damage.
The ground is smoky. It can be smoked in the ground before cooling down, and the temperature can be increased locally by physical methods to reduce the degree of freezing damage.
Remove the early stalk. If the rape blossoms and blooms early, it will consume a lot of nutrients and weaken the cold resistance of the plant. At this time, pick the stalks in time to reduce the degree of freezing damage. Picking is carried out at noon on a sunny day. After picking the stalks, apply appropriate amount of quick-acting nitrogen fertilizer in time to promote the growth of rape and prevent freezing damage.
Remedy this
Check the seedlings in time. For rapeseed with root uprooting, it is necessary to crush the soil and cultivate 8-10 cm in time to prevent the roots from cutting off and dead seedlings; remove the field water in rainy and snowy weather as soon as possible to prevent waterlogging from hindering the root growth; when thawing, sprinkle wood ash or fire soil ash, Spray fresh water on the leaves in time to alleviate the water imbalance and prevent water loss and dead seedlings; after thawing, apply quick-acting fertilizer in time to promote branching and increase the fruit position; for the stalk buds with the main stem cracked and severely frozen The leaves should be removed in time.
Replant and replant in time. In the event of freezing damage, for severely damaged plots (the upper part of the ground is severely withered, most of the plants and growing points are immersed or broken when frozen; the dead plant rate is more than 50%), the replanting should be carried out in time, and the replanting cannot be mature. The plots should be replanted with other suitable early-maturing crops.
Break the compaction. For dry land with lighter freezing, weeding and intertillage should be combined as early as possible to facilitate the rapid rise of ground temperature, speed up root growth, and promote the transformation and upgrading of seedling conditions.
Strengthen the prevention and control of pests and diseases. After the rape is frozen, the stress resistance decreases, and the prevention and control of diseases and insect pests should be strengthened. For rape jumping beetle and stem weevil, the use of 4.5% beta-cypermethrin, 10% imidacloprid, 3% acetamiprid microemulsion has better control effect. Please pay attention to rape powdery mildew and downy mildew. You can use 15% triadimefon WP 1500-2000 times liquid or 70% Thiophanate-methyl WP 500-600 times liquid for spray control, 10 days 1 For downy mildew, choose 150-200 times liquid of 40% shuangyeling wettable powder or 500 times liquid of 75% chlorothalonil wettable powder, and 600-800 times liquid of 72.2% Pulique. Liquid, 65% daisen zinc 600 times liquid spray control. The general medication is 1 to 2 times, 10 to 15 days apart.
Strengthen later management. Frozen rape should be watered early, topdressed early, small amounts and many times, especially in the budding stage, reapply nitrogen fertilizer, increase phosphorus, potassium fertilizer, and spray boron fertilizer to promote branching and increase the number of siliques per plant. The number and weight of grains per horn increase the yield.
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