After the rapeseed is extracted from the moss, it enters the period of vegetative growth and reproductive growth. In the early spring, the gas changes frequently, and when it is cold and hot, the field management must take precautions against freezing damage. The specific measures can be managed from the following five aspects:
1, due to seedlings: due to seedlings, due to the application of topdressing, improve their ability to resist cold. The weak seedlings with nitrogen deficiency showed: the plants were short, the old leaves turned red and yellow and developed to the new leaves. The urea was applied 8 to 10 kg per mu; the weak phosphorus seedlings showed: the leaves were slow, the leaves were erect, and the middle and lower leaves were dull. It is dark green, petiole and veins are purple-red, and 25-30 kg of superphosphate can be applied per acre. The lack of potassium weak seedlings is characterized by the gradual appearance of focal edges and pale brown spots on the tip of the leaf tips, and the mesophyll tissue is burnt. The application of potassium chloride is 8-10 kg; the weak boron seedlings are characterized by: leaf edge rewinding, blue plaques appear in the leaves, and 10 kg of borax can be sprayed with 60 kg of water per acre. At the same time, it is necessary to increase the amount of fertilizer used for the land with thin ridges; the fertility is good, the bottom is fat, and the plots of Miaozhuang Miaowang are less or not applied.
2, cultivating soil 壅 pocket: clearing the ditch to cultivate soil roots, can improve the soil environment, loose soil, thicken the root soil layer, increase the ground temperature, and improve the cold resistance of rapeseed. In particular, after the high-stem seedlings are cultivated, the root system is shortened and thickened, which is beneficial to improving the ability of rapeseed to resist cold wind invasion.
3, covering antifreeze: with thatch, crop straw planted in the row of rapeseed, can maintain the ground temperature is relatively stable, bridging the soil seam, reducing the cold wind directly invading the roots, at the same time, in order to reduce the freezing of the leaves, can be used to spread the grass ash on the leaves, or Straw, thatch directly covers the leaves, and then unraveled and then uncovered.
4, drought resistance and antifreeze: drought will affect the lack of water nutrients absorbed by rapeseed roots, affecting photosynthesis, so that the cold resistance is weakened. In the case of drought, it should be poured once in a timely manner, and the effect of using dilute water is better.
5, spraying boron fertilizer: rapeseed lack of boron, dysplasia, atrophy is not long, will greatly reduce the ability to resist cold, spray 2 to 2 times 0.2% of the boron fertilizer solution in the seedling stage.
The above is the precautionary measures for freezing damage in rapeseed, for your reference, and hope to help you. Huinong School has more relevant agricultural technology knowledge, and continue to pay attention to the Huinong School to answer questions during the planting process.
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