1. Look at the seedlings and formula fertilization. 0.5-1.0 kg of boron fertilizer per acre. Excessive application of boron (more than 2.5 kg per mu) can not only increase the yield of rapeseed, but will reduce the emergence rate of rapeseed and even cause the death and reduction of rapeseed. In addition, when applying boron fertilizer, it should be mixed with organic fertilizer and nitrogen, phosphorus and potassium fertilizer to mix and apply better. It can be ditched or applied, but it should not be applied in full, and the boron fertilizer should not be directly contacted with the seed or seedling roots.
2, the amount of leaf spray to protect the number. For rapeseed which is expected to be deficient in boron, it should be used in the critical period of two rapeseeds in the late stage of seedling (before and after flower bud differentiation) and in the twitching period, or in the case of the occurrence of boron deficiency in rapeseed, 0.1% of the speed-boron boron should be used in time. Or 0.5% borax aqueous solution sprayed 1-2 times, the amount of liquid medicine is fully wetted with rape leaves and drops under waterless beads. The amount of liquid used for rapeseed seedlings is about 45 kg, and the pumping period requires more than 60 kg. If the amount of liquid used is insufficient, it will not achieve the desired effect. If it rains within two hours after spraying, it should be re-sprayed.
3, the quality of application for years to come. Since rape requires more boron, it is necessary to apply boron every year in principle, and it is necessary to ensure the quality of boron fertilizer, and prevent the use of counterfeit products to cause labor and economic damage.
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