The application of boron fertilizer is the most effective measure to prevent rape atrophy. According to the nature of boron fertilizer, soil and cultivation conditions and the nutritional characteristics of boron boride, reasonable application of boron fertilizer.

(1) Mastering the types and properties of boron fertilizers Boron fertilizer is a micro-efficient fertilizer. Compared with hydrogen, phosphorus, and potassium fertilizers, the demand for rapeseed is relatively small, and the boundary between appropriate and excessive amounts is very small, and overdose often produces poisoning. At present, boron boron (boron sodium salt), the most commonly used boron fertilizer in domestic rapeseed production, is low in price, easy to use, contains 11% boron, and has less effective components than boric acid, but has the same effect. In addition, there are boron-containing compound fertilizers, such as phosphorus-boron fertilizer, or nitrogen, phosphorus, potassium, boron compound fertilizer. As these elements are all essential elements for the growth and development of rapeseed, the effect of increasing yield on rapeseeds is significant.

(2) Boron fertilizer is directly applied to the soil as basal fertilizer. Before sowing or transplanting rapeseed, 0.5-1 kg boric acid per acre is mixed with other fertilizers to co-operate with basal fertilizer, which is beneficial to meet the needs of boron in the whole growth period of rapeseed, and has long fertilizer effect. And to save labor, in the serious lack of boron soil, the effect of increasing production is particularly significant. Since boron has an inhibitory effect on seed germination and radicle growth, direct contact of boron fertilizer with seeds should be avoided. Rapeseed is prone to boron deficiency and can be poisoned by excess boron. Therefore, excessive application of boron will reduce the emergence rate, resulting in dead seedlings, slow growth after emergence, late postharvest fruit reduction, yield decline.

(3) Spraying boron fertilizer on the foliage of boron fertilizer has a good effect on preventing flowering. Spraying concentration (according to the weight of boron fertilizer) is 0.1%-0.3%, that is, borax 0.1-0.3 kg plus 100 kg of water is prepared into a boron-containing aqueous solution, and the foliar surface is evenly sprayed. Spraying boron should be done on a sunny evening or in the morning. Because the relative humidity at this time is large, 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. The key to fertilization of winter rapeseed spray is seedling stage and bud stage, and the effect of spraying boron fertilizer during flowering stage and fruit development stage is poor. This is because spraying boron at the seedling stage can promote root growth, favoring normal flower bud differentiation, spraying boron at the bud stage, and promoting stem elongation, not causing the leaves to turn green due to lack of boron, weakening photosynthesis, and in particular guaranteeing Flower buds and other reproductive organs develop normally and avoid flowering. Therefore, spraying boron once during the seedling stage and the bud stage produced significant yield increase. In addition, spraying boron on the seedbed before 1-3 days of transplanting rape is not only beneficial to rooting after transplanting, but also economical. Although there is a significant increase in boron production from foliar spraying, in areas with severe boron deprivation or in soils, such as low spraying frequency, boron injection is often not able to ensure the need for boron in rapeseed in a timely manner, so the spraying effect is lower than that of the base boron fertilizer. .

(4) Other methods of boron application The effect of increasing the yield of rapeseed can be achieved by using 10 to 10 grams of boric acid or 200 grams of borax for soaking seeds or soaking in water containing boron for 12 hours per acre. However, due to the inhibitory effect of boron on the germination of seeds, the use of boron seed dressings should be careful, and should not be used under normal circumstances. In addition, when transplanting rapeseed, rooting with a 0.1% boron-containing aqueous solution has a certain effect on yield increase. The above two methods have the characteristics of strict technical requirements, inconvenient operation, and high labor costs. Therefore, they are rarely used in production.

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