Farmers who grow rapeseed for a long time are accustomed to applying boron to rapeseeds, but the knowledge about boron needed for rapeseed is not comprehensive enough.
Boron fertilizer has a significant effect on promoting rapeseed production. However, farmers often have some mistakes in the application process: one is to apply boron fertilizer only in basal fertilizer and ignore topdressing boron fertilizer; the other is to use flower spray fertilizer instead of full-use fertilizer; third is to think that boron application at seedling stage has no effect; The amount of boron is insufficient; the fifth is the use of low-level (effective content is less than 5%), low-priced boron fertilizer. Therefore, symptoms of boron deficiency often appear to varying degrees at various stages of the rape growth process.
Brassica napus is very sensitive to boron deficiency, and there are symptoms of boron deficiency at various stages of growth. Seedlings lack boron, the roots are small and fine, the root neck is swollen, and the leaves turn brown and gradually wither. Lei moss lack of boron, leaf shrinkage, veins and around the yellow, there are purple plaques. Boron deficiency during flowering, petal shrinkage, bud atrophy or even dry, pods do not inflate or become deformed, there is a genital warts, known as flowers rather than real.
In order to correctly and better apply the rapeseed boron fertilizer, three points should be noted at the moment:
First, comprehensively raise awareness of the need for boron in rapeseed. First, after the application of boron fertilizer in rapeseed, boron can be combined with the polysaccharide component of the cell wall to improve the stability of the cell wall, promote the synthesis of ribonucleic acid and pollen tube germination, as well as the rapid growth of meristem and prevent the rape from flowering; Promote the conversion of carbohydrates in rapeseed, accelerate the synthesis of sucrose and hydrolysis of starch; Third, it can strengthen the control of water on the cell wall, enhance the cold resistance and disease resistance of rape; The fourth is to improve the quality of rapeseed, and the content of oil can be increased. 6 percentage points or more.
Second, multiple methods and flexible application of boron fertilizer. Rape must be applied throughout the boron. One is the application of basal fertilizer before planting, and the holding force of boron is 0.2-0.5 kg per acre or about 1 kg of borax; the second is the use of seedling transplanting, 2-3 days before planting, spraying 0.1-0.2% borax solution 50 kg per acre seedbed. Or when planting with 0.2% borax roots; Third, after the winter season after planting, spray 0.2% of Sorole Boron solution, 60 kilograms per mu; fourth is sprayed with 0.2% Sorole Boron solution per acre 60-70 kilograms; Fifth, the early flowering spray of Sonic solution of about 80 kg per mu.
Third, pay attention to the quality of boron fertilizer application method. Promote the use of high levels of boron fertilizer. When used as a basal fertilizer, it is best to mix with a bio-organic compound fertilizer or a farmyard fertilizer or mix it with an inorganic compound fertilizer. When topdressing, one must fully dissolve, and the other must control the dosage. The third must not re-spray or spray.
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