ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Influence of mid-summer boron sprays on boron content and quality indices of 'Delicious' apple.

Peryea, F. J.; Drake, S. R.;

Journal of Plant Nutrition Year: 1991 Vol: 14 Issue: 8 Pages: 825-840 Ref: 21 ref.

1991

บทคัดย่อ

B is required for optimal yield and quality of apple fruits but may impair fruit quality if present in excess. A field experiment was conducted to examine the effects of a single mid-July foliar B spray (0, 11.3 or 22.6 g B/tree) on the B content and postharvest quality indices of 220-g cv. Starking Delicious apples. Fruit B concentration was positively related to B application rate and ranged from 9 to 55 mg/kg dry mass (1.3 to 7.7 mg/kg fresh mass). The relative B increases were greater in the core and inner cortex than in the outer cortex and skin, suggesting that some of the applied B entered the fruit through the tree vascular system. Increasing fruit B concentrations caused minor changes in fruit external colour indices L and b and internal colour index b but had no effect on firmness, soluble solids concentration, titratable acidity, starch index, external colour index a, or internal colour indices L and a. None of the effects were of horticultural significance. Most fruit quality indiceswere influenced by postharvest sampling time and reflected typical postharvest ripening patterns. The results suggest that Starking Delicious apple quality is relatively insensitive to high fruit B concentrations.