Rapeseed atrophy is not real disease severely reduces the quality of rapeseed quality, causing serious economic losses, timely pesticides to control is necessary, here are the causes of the disease and the specific control measures by the Chinese pesticide for everyone Xiaobian:
The rapeseed atrophy is often manifested in the flowering period, the light shaded pods are not real, and the heavy seedlings begin to show symptoms. There are three common types. Dwarf type: plant dwarfing, inflorescence, flower, pod spacing shortened, flower buds, young pods fall off a lot, pod deformity twisted or shortened; branch clusters or branch nodes are low, base 2-3 times more branches, Although flowering, but not strong; stems and inflorescences top yellow-white, atrophic and dry, stem surface turned purple or blue-violet, cortex with longitudinal slit; leaves turned purple red to dark green, purple plaque, yellow veins, small leaves , shrinkage, thick and brittle; root swelling, root dysplasia, epidermal cracking brown, less roots and fine roots. The long-length plants were obviously increased, the plant type was loose, the inflorescences were slender, and they were draped downwards. Although they were flowering, they were not strong; the roots and branches were normal, but the pods were few, some of them were atrophy, and the gaps were realized. The normal plant type, plant height, leaves and roots were normal, but the pods at maturity were not mature, and the flowering continued to bloom at the top of the inflorescence, but it was not strong.
Rapeseed atrophy, rapeseed atrophy, also known as flowering, is a physiological disease caused by the lack of effective boron in the soil. After the disease occurs, the yield is generally reduced by 20%-30%. In severe cases, there is almost no harvest and the oil content is also significantly reduced.
[Cause]: Brassica napus, must have appropriate boron nutrition in the process of growth to maintain good development and strong growth. In the absence of boron, the growth of rapeseed is blocked, resulting in atrophy. Boron deficiency is closely related to soil, variety and cultivation techniques. First, the soil is deficient in boron. Red clay, purple sand, red-yellow muddy soil and soil with poor soil loss and water retention capacity are less than 0.5mg/kg and will be in a boron-deficient state. The second is a long-term drought. Not only the role of soil boron is enhanced, but also the biological activity of soil organic boron compound decomposition is reduced, so that the effective boron content in the soil is reduced, and the boron deficiency of rapeseed is aggravated. The third is unreasonable fertilization. Unbalanced balance between canola and other nutrients can cause or aggravate the occurrence of boron deficiency. If the application of nitrogen fertilizer is not combined with the application of boron fertilizer, it will often lead to the aggravation of boron deficiency. Excessive application of lime or phosphate fertilizer will cause the sliding vegetables to absorb too much calcium. The ratio of calcium to boron in rapeseed is too high, which will lead to boron deficiency. occur. The fourth is the difference caused by the sowing date and the variety. The late sowing and late planting were heavier than the early sowing and early planting; the field of continuous rapeseed cultivation and flooding, the vegetable field of the former paddy field was heavier; the cabbage-type rapeseed was heavier than the cabbage-type rapeseed; The degree of onset of the cabbage varieties is different, the early maturing varieties are lighter, the medium maturity is second, and the late maturity is the heaviest.
[Control methods]:
(1) Improve soil properties. It is recommended to apply compost or decomposed organic fertilizer prepared by enzyme bacteria, and apply chemical fertilizer with formula fertilization technology, and apply nitrogen, phosphorus and potassium together. 250-500g of 667m2 borax, which is seriously deficient in boron, is mixed with the base fertilizer and applied or applied. It fundamentally improves the physical and chemical properties of the soil and increases the soil organic matter and soil available boron.
(2) Add boron fertilizer. 1 Seedling period 2-3 days before planting, the pesticide manufacturer recommends spraying a 0.4% borax solution, spraying 50L per 667m2 seedbed. 2 Honda applied boron. According to the degree of boron deficiency in the soil, the spraying of boron in the seedling period within 10 days, the flood season and the flowering period shall be controlled 1-2 times, and 50-100 g of borax per 667 m2 shall be sprayed on 50 L of water. For 667m2 of severe boron deficiency, use 250-500g of borax to dilute 400-500L of water and drizzle. When preparing a borax solution, the borax should be first opened with a small amount of hot water. It is recommended to apply 21% high-efficiency instant boron fertilizer, which can greatly increase the yield of rapeseed per 667m2100g.
(3) Strengthen the management of fertilizer and water. Do a good job of drought resistance and drainage, promote the conversion and release of soil organic boron, while maintaining root activity and improving absorption function; apply appropriate amount of phosphate fertilizer, the application amount per 667m2 is not more than 40kg, avoid applying a large amount of lime on acidic soil to prevent soil effective boron Due to the imbalance between calcium and boron in rapeseed.
(4) Adjust the sowing date. According to the pesticide network , it is suitable for early sowing, cultivating strong seedlings and early planting, promoting the development of rape roots in depth and expanding the area of ​​nutrient absorption.

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