In the production practice, grape small fruit phenomenon often occurs. The reason is that in addition to environmental conditions affecting grape pollination and fertilization, boron deficiency and zinc deficiency are also a major factor.
Small fruit produced by boron deficiency, poorly developed or non-nuclear, earlier than normal fruit, soluble solids 1 to 15 percentage points higher. The lack of boron in grape plants varies with varieties. Red Fuji grapes are less boron-poor, followed by vines, and the peaks are lighter. The control measures can be sprayed with 0.3% borax solution before or during the flowering period, or combined with the application of base fertilizer, and 1.5 kg of borax is applied per mu.
When the zinc is deficient, the ears are loose; the fruit is less than normal, and the size is different, no seed; the small fruit is more, and the small fruit is always hard, green, immature, and has no edible value. The peak of zinc deficiency is the heaviest, followed by Red Fuji, and the vine is lighter. The control measures can be sprayed with 0.2% alkaline zinc sulfate solution 2 to 3 weeks before flowering. After winter shearing, the mother shoots (spray) a 10% zinc sulfate solution.
Small fruit produced by boron deficiency, poorly developed or non-nuclear, earlier than normal fruit, soluble solids 1 to 15 percentage points higher. The lack of boron in grape plants varies with varieties. Red Fuji grapes are less boron-poor, followed by vines, and the peaks are lighter. The control measures can be sprayed with 0.3% borax solution before or during the flowering period, or combined with the application of base fertilizer, and 1.5 kg of borax is applied per mu.
When the zinc is deficient, the ears are loose; the fruit is less than normal, and the size is different, no seed; the small fruit is more, and the small fruit is always hard, green, immature, and has no edible value. The peak of zinc deficiency is the heaviest, followed by Red Fuji, and the vine is lighter. The control measures can be sprayed with 0.2% alkaline zinc sulfate solution 2 to 3 weeks before flowering. After winter shearing, the mother shoots (spray) a 10% zinc sulfate solution.
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