The latest measures to protect rape seedlings overwintering

Rapeseed is a winter crop sown in autumn. It has a little ability to resist cold, but it is often caused by cold air invasion and improper sowing and fertilization, resulting in different degrees of yield reduction. Therefore, when rape overwinters, we should combine the local actual situation and adopt corresponding technical maturity to prevent or reduce the freezing injury of rape and make it safely overwintering.

1. Increase fertilizer application

Phosphorus fertilizer can promote the growth and development of rape root system and enhance resistance, while potassium fertilizer can improve cold-resistance, disease-resistance and lodging resistance of rape. Therefore, some phosphorus and potassium fertilizers can be added to rape in winter, which can not only promote the growth of rape, but also increase its freezing resistance. Organic fertilizers such as pig dung and soil ash can also be used before wintering, and at the same time, it can also increase the freezing resistance of rape. Fertilization amount should also be controlled well, not too much fertilizer, generally 2000-3000 kg of fertilizer per mu, 10-15 kg of calcium phosphate, 50-10 kg of potassium chloride can be used.

2. Cultivation

It can be cultivated and loosened for 2-3 times in the winter period, which can improve the soil structure of rape days, regulate soil moisture, facilitate fertilizer infiltration, enhance soil fertility and heat preservation ability, improve ground temperature, prevent plant lodging, and reduce grass damage and sclerotium damage. The depth of cultivation varies according to the growth of Camellia oleifera. Generally, it is shallow first and then deep. The fields with strong growth can be deeply hoe properly, while the fields with weak growth should be shallow hoe.

3. Drainage and irrigation

Three ditches should be opened before winter, and the ditch should be cleared in time to drain the accumulated water in the field, reduce the humidity in the field, promote the growth and development of roots, and help reduce the cold damage. However, it is necessary to irrigate overwintering water once before overwintering, which can stabilize the ground temperature, provide sufficient water for the whole overwintering period of rape, avoid the large reduction of low temperature, alleviate freezing damage, and effectively prevent soil from freezing. Irrigation frozen water must be irrigated thoroughly, irrigation with drainage, keep the soil moist, frozen water suitable in sunny noon, so as not to be the soil surface sinking down, to ensure that the roots and soil closely connected.

4. Remediation after freezing

After the winter cold current, seedlings should be checked in time. For rape with uprooted roots, soil should be broken and bacon should be taken in time to avoid root cutting and seedling death. Rain and snow days should be removed in time, so as not to hinder the growth and development of roots, at the same time, plant ash or fire ash should be scattered when thawing, and water should be sprayed on the leaves in time to alleviate water imbalance, so as not to lose water and die seedlings. After the soil thaws, fertilizer should be applied in time to promote branching and increase fruiting positions. The buds and leaves affected by freezing injury should be removed in time.

The above is an introduction to rape overwintering seedling protection measures. I hope it can help you. If you want to know more about it, please pay attention to us.