is applied via the leaf, diluted in water, depending in the deficiency detected:
- SLIGHT DEFICIENCY: 0.1-0.2% (100-200 cc/hl).
- MODERATE DEFICICIENCY: 0.3-0.4% (300-400 cc/hl).
- STRONG DEFICIENCY: 0.5-0.6% (500-600 cc/hl).
Boron becomes stuck on the leaves and so will only be effective on the parts of the plant that are reached by the spray. It is applied in normal spray to the stems/stalks, using large quantities of broth so as to drench all the plant well.
2 or 3 treatments are recommended, allowing 3 weeks between one and the other.