In recent years, the production of double bottom rapeseed in Quzhou City has developed rapidly, especially in winter 2008. Due to the expansion of rapeseed planting area, the supply of rapeseed is in short supply. In the later period, the market supply is all hybrid double-low rapeseed varieties. To this end, we need to remind the majority of rapeseed farmers:
1. Rapeseed is a boron-tolerant crop, requiring more boron than other crops, especially for double-lower rapeseeds. Boron is essential for the meristem of the double-low rapeseed growth point, as well as the development of pollen, ovary ovule differentiation, fertilization, and embryo development. Double-low rapeseed is sensitive to boron fertilizer. Once the soil is deficient in boron, it is more prone to "flowering and not realizing" and has a greater impact on yield. In severe cases, it can result in a reduction of production by more than 70%.
2. The main reasons for the lack of boron: First, the lack of boron in the soil; Second, partial application of nitrogen fertilizer, potassium fertilizer can also cause potassium and boron antagonism and the phenomenon of boron deficiency; Third, autumn and winter dry autumn and winter in individual years, the soil of boron is fixed, Rapeseed is difficult to absorb, and the symptoms of boron deficiency occur. Fourth, counterfeit boron fertilizer, boron content is very low, or even not, the application of such boron fertilizer, there will still be symptoms of boron deficiency.
3, easy boron deficiency varieties and boron fertilizer application methods. At the moment, the weather is picking up and rape is in the bud stage. It is a crucial period for the application of boron fertilizer. In particular, there are soil-deficient boron blocks and double-low rapeseed varieties, such as Zheshuang No.6, Youyan No.10, Zhejiang Youyou 18, Hunan miscellaneous oil series, Zhongyou miscellaneous series, Zhejiang Shuang 72, etc. Mu with 100 ~ 150 grams of borax, the application concentration of 0.2%; or the United States imported 20.5% Sonic 30 ~ 45 grams, the concentration of 0.1% spray. In particular, we must emphasize the selection of authentic high quality boron fertilizers to ensure a high yield of rapeseed this year.
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