บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Management of nitrogen and calcium in pear trees for enhancement of fruit resistance to postharvest decay.

Sugar, D.; Righetti, T. L.; Sanchez, E. E.; Khemira, H.;

HortTechnology Year: 1992 Vol: 2 Issue: 3 Pages: 382-387 Ref: 27 ref.

1992

บทคัดย่อ

Management of nitrogen and calcium in pear trees for enhancement of fruit resistance to postharvest decay.

Results of various trials on the nutritional management of pear trees for low N and high Ca fruit content aimed at reducing the severity of postharvest fungal decay are discussed. Calcium chloride sprays during the growing season increased fruit Ca content, and N application 3 weeks before harvest supplied N for tree reserves and for flowers the following spring without increasing fruit N content. N and Ca management appeared to be additive factors in decay reduction. Fruit density and fruit position in the tree canopy influenced fruit response to N fertilization. N:Ca ratios were lowest in fruits from the east quadrant and bottom third of trees, and from the distal portion of branches. High fruit density was also associated with low N:Ca ratios. The results suggest that nutritional management should be used in conjunction with other methods for postharvest decay control.