The low temperature and rainy rain in spring is a key period for the growth of rapeseed. It needs to absorb a large amount of nutrients to achieve the purpose of stable spring, many strong branches and many pods. Therefore, scientific field management is essential.

1. Clean up the "three ditch" to prevent waterlogging

Last winter, the drought was long, and the rainy time in spring may be longer. Therefore, it is necessary to prepare for flood control. For rapeseed fields that are susceptible to waterlogging, the springs should be carefully cleaned up, such as the trenches, the lumbar ditch and the furrows, so that the “three ditch” can be matched, the ditch and the ditch can be connected, and the clear water can be drained and the dark water can be drained. It can filter, reduce the humidity in the field and promote the growth of rapeseed roots.

2, remove the frozen vegetables, see the seedlings and apply the fertilizer

For the frozen rapeseed, it is necessary to grab the clear and remove the moss. The base fertilizer should be adequately applied, and the drought is lighter in winter. There is basically no freezing in the spring. The vigorous and vigorous rapeseed can be applied less or not, so as to prevent the late application of the nitrogen fertilizer due to excessive application of nitrogen fertilizer. On the contrary, the application of the bottom fertilizer is less, the winter is affected by drought, the growth of the plant is weak, and the rape in the spring is subjected to freezing and picking the moss. It is necessary to apply the fertilizer fertilizer. Generally, 7-10 kg of urea is applied to the mu, and the rapeseed is restored as soon as possible. Increase branching and increase production.

3, the surface of the spray of boron, to prevent "flowers and not real"

Rapeseed is sensitive to boron deficiency, especially double-low quality rapeseed, which is more sensitive to boron deficiency. At present, the area of ​​rapeseed is relatively large, and the drought in the soil is also degraded this winter. The effectiveness of boron in the soil is also reduced. The rapeseed plants are generally deficient in boron, so special attention should be paid to the application of boron fertilizer. At present, although there are more rains and rains, it is the best time for spraying rapeseed on the surface of rapeseed. Farmers must overcome the difficulties and pay attention to the application of boron fertilizer in the rainy weather. Generally, 0.1% of the speed-boron or 0.5% of the borax aqueous solution is used. 60 kg, evenly spray 2-3 times to prevent rapeseed from "flowers and not real".

4, effectively grasp the prevention and control of pests and diseases

During the flowering period, there are more years of rain and rain, especially to strengthen the prevention and control of Sclerotinia sclerotiorum. Generally combined with the flowering period of boron, the use of 50% of the keeling (or sclerotium net) WP 80-100 grams, or 25% of the fresh gram cream 30--40 grams, or 2% of the bacteria gram 120-180 ml of water, sprayed evenly with 60 kg of water. At the initial flowering stage, apply once every 7-10 days, and the drug solution should be sprayed on the middle and lower parts of the rapeseed to improve the application effect.

The above is the management point of spring rapeseed. Farmers should observe the growth of rapeseed in time to topdress, prevent rapeseed from early flowering, maintain proper soil and moisture, and promote the development of pods and seeds. During this period, we must also pay attention to insects and birds, and the early spring frost damage and cold spring can not be ignored.

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