Symptoms: Cauliflower is very sensitive to trace elements such as boron. Boron deficiency often causes voids in the center of the flower shaft. In severe cases, the flower bulbs become rust brown and bitter, and the flowering branches of the plant are not easy to loose.
Etiology: Soil effective boron 0.3 × 10 ˉ 6 is the critical value of boron deficiency, showing symptoms of boron deficiency.
Control method: Each 1/15 hectare (1 mu) can be mixed with borax or boric acid to form an aqueous solution, which is applied to the planting hole as the base fertilizer. Or use 0.1% ~ 0.2% borax or boric acid as the root top dressing, in order to spray the effect in the early stage of plant growth.
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