Prevention of rape "flowers but not real"

Rapeseed "flower but not real", also known as shrinking is not true. That is, from the onset of disease to maturity, it still continues to bloom, but it can not be normally solid. It is a physiological disease caused by planting rapeseed on boron-deficient soil. It mainly occurs in the cabbage type, but it has also been found in cabbage-type rape in recent years. After the onset of the disease, generally 2 to 30% of production is reduced. Severe or even rare harvest is a problem worthy of attention in rapeseed production. Brassica napus L., a boron-absorbing crop, promotes the germination of pollen, and facilitates the rapid entry of pollen tubes into the ovary, facilitating the formation of seeds. The most obvious feature of boron deficiency is "flowering but not real." Extension cylinder Shu Ang ǘ? Paul Wong lazy? Colonization Po? Mash Wong lazy <creators and warehouse Po ⒉> Carpenter moisture tonight?-Month call? Huan Gap? Ǎ ?? shortage glycosides? = J steal Yao Chen Beng lazy cormorant resistant Liao Lang This is the kind of Canton Master's 恢Courage Childishness, 鸬 Γ Γ 饕 饕 饕 ( ( ( ( ( ( ( ( ( ( ( (5)?醪 ~ ~ 30%, serious or even very small harvest, is a noteworthy issue in rapeseed production. Brassica napus L., a boron-absorbing crop, promotes the germination of pollen, and facilitates the rapid entry of pollen tubes into the ovary, facilitating the formation of seeds. The most obvious feature of boron deficiency is "flowering but not real." When boron is severely depleted, rape can develop in the seedling and flood seasons, and diseased plants wither and die. Moderate, mild boron deficiency, onset after flowering, diseased plants can not normally seed. The application of boron fertilizer can effectively prevent and control rapeseed from flowering. According to many years of experiments, planting double-low rapeseed in areas where there is a shortage of boron and adopting boron measures can generally increase production by 10% to 20%. Studies have shown that compared with Zhongyou 821, double-low rapeseed has stronger boron-absorbing capacity and requires higher boron content. When the water-soluble boron content in the soil is lower than 0.5 ppm, boron deficiency symptoms may occur to severely reduce production. At or slightly more than 0.7PPm can significantly increase production. Mastering the Types and Properties of Boron Fertilizers Boron fertilizer is a micro-efficient fertilizer. Compared with nitrogen, phosphorus, and potassium fertilizers, the demand for rapeseeds is relatively small, and the boundary between appropriate and excessive amounts is very small, and overdose often produces poisoning. At present, the most commonly used boron fertilizer in domestic rapeseed production is borax (sodium salt of boron), which is low in price and convenient to use. The content of boron is 11%, and the active ingredient is less than boric acid, but the use effect is the same. In addition, there are boron-containing compound fertilizers, such as phosphorus boron fertilizer. As these elements are all essential elements for the growth and development of rapeseed, the effect of increasing yield on rapeseeds is significant. The application of boron fertilizer from outside the roots to prevent rape from “flowering but not real” and ensure high yield of rapeseed. Based on the application of boron fertilizer at the end, the application of boron fertilizer to the root is very good during the convulsive period and when the alfalfa is about 3 cm high. Effect. Spraying concentration of 0.1% to 0.3%, that is, borax 0.1 ~ 0.3 kg water 100 kg prepared into a boron-containing aqueous solution, evenly sprayed on the leaves of rapeseed. Spraying boron should be done on a sunny evening or in the morning. Because the relative humidity is high at this time, the stomata opening is conducive to the absorption of rape into the body. Do not spray when dry and windy. Rainfall should be reapplied within 36 hours of spraying. Borreol spray the most off winter rape

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