In winter crops, cruciferous crops account for a large proportion, such as cabbage, cabbage, radish, etc. These crops are particularly sensitive to boron. At the same time, celery, wheat, carrots, etc. are also more sensitive to boron. Boron deficiency is not only seriously affected reproductive growth, but also blocked vegetative growth, decreased cold resistance, but also easy to induce heart rot. How do you add boron? The application method is as follows:
Basal fertilizer: Boron fertilizer has the best effect on medium or severely deficient boron soil; 0.5-0.75 kg borax can be used per acre to mix with dry fine soil or organic fertilizer, and then ditch can be applied or applied; or with nitrogen. , Phosphorus, potassium and other fertilizers are mixed together and applied together. Do not make the boron fertilizer directly contact the seeds (live) or seedlings (transplanting), so as to avoid affecting the growth of germination, emergence, and young roots and seedlings; it is not suitable for deep turning or spreading. The amount should not be too large; if the application of borax per acre more than 2.5 kg, it will make the emergence rate decreased, or even reduce the production of dead seedlings.
Treatment seed: borax or boric acid is recommended for soaking. Usually the borax is dissolved with hot water at 40°C, then diluted with cold water to 0.01%-0.03% borax or boric acid solution. The seeds are poured into the solution and soaked for 6-8 hours. The seed and liquid ratio is 1:1, and the seeds can be sown after drying out.
Foliar spraying: Use 0.1%-0.25% borax or boric acid solution, spray 40-80 kg solution per acre each time, 6-7 days, spray 2-3 times. Foliage spraying in the afternoon as well, sprayed to the foliage covered with droplets is appropriate; if the rain within 6 hours after spraying, should be re-spray 1 times.
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