Rapeseed is a typical boron-tolerant crop, which requires high boron content, strong boron absorption capacity, and is very sensitive to boron nutrition. The lack of boron in rapeseed, atrophy at seedling stage is not long, flowering is not true, and it has a great impact on yield and quality. The application of boron fertilizer can promote the normal growth and development of rapeseed, increase the number of pods, increase the seed setting rate and 1000-grain weight.
Before sowing or transplanting rapeseed, mu is mixed with 0.5-1 kg of borax and other fertilizers as base fertilizer. Since boron has an inhibitory effect on seed germination and radicle growth, avoid direct contact between boron and seed. When fertilizing, mix the boron fertilizer with fine dry soil or other organic fertilizers, and apply the ditch or acupuncture points. Do not make the seed (live) or the young root (transplanting) in direct contact with the boron fertilizer so as not to harm the seeds and the young roots. . It is not appropriate to deepen or apply boron fertilizer. In addition, foliar application of boron fertilizer is a cost-effective method. Before spraying rapeseed, 1-3 days before the rapeseed, spraying boron on the seedbed is not only conducive to rooting and greening after transplanting, but also economical. The concentration of boron fertilizer applied on the foliar of rapeseed is 0.1%-0.3%, that is, 0.1-0.3 kg borax and 100 kg water are added, and the leaf surface is evenly sprayed, so that the leaf surface is fully wet without dripping water. Spraying boron should be done on a sunny evening or in the morning. Within 4 hours after spraying, in case of rain, it should be re-sprayed.
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