ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

The role of calcium and nitrogen in postharvest quality and disease resistance of apples.

Fallahi, E.; Conway, W. S.; Hickey, K. D.; Sams, C. E.;

HortScience Year: 1997 Vol: 32 Issue: 5 Pages: 831-835 Ref: 71 ref.

1997

บทคัดย่อ

Ca and N play important roles in all aspects of apple tree physiology, including postharvest fruit quality. Ca affects fruit softening because it is an essential part of the cell wall structure and it also influences cell membrane integrity. Preharvest Ca sprays do not increase total or cell wall Ca concentration sufficiently to reduce decay due to postharvest wound inoculation, or maintain fruit firmness. However, these sprays previously have been shown to have some fungicidal effects on decreasing the incidence of natural decay in the field. Combining Ca sprays with reduced fungicide concentrations needs further study. Also molecular aspects of N- and Ca-related problems such as bitter pit, watercore and internal breakdown, require further investigation. N influences fruit colour, firmness and TSS. With an increasing trend toward high-density orchard systems, and public concern about nitrate contamination, the precise N requirement for each cultivar/rootstock combination needs to be evaluated

to assure optimum fruit quality without groundwater contamination.