Effects of foliar sprays of CaCl_2 with some adjuvants on fruit quality of pear (Pyrus pyrifolia Nakai)

摘要

This study was conducted to investigate the effect foliar spray of calcium with some adjuvants directly to 'Niitaka' pear trees during growing season on mineral nutrients and fruit quality of cold storage. The calcium content in young fruits was increased by foliar spray of calcium with some adjuvants before bagged, but it was not significantly different among treatments. The calcium content of shoot leaf and fruit peel were highest in CaCl_2+phytic acid treated fruit, but spur leaf, fruit flesh, and stalk were highest in CaCl_2+amino acid treated fruit. The major form of calcium increased in treated fruit peel and flesh were water soluble and exchangeable ones during storage. The alcohol insoluble substances were gradually decreased during storage, but it was not significantly different in treated fruits. The flesh firmness was gradually decreased during storage, but calcium spray effectively inhibited the decrement of flesh firmness. It was maintained at higher level in CaCl_2+wood vinegar treated fruit during storage periods. The soluble solids content was gradually increased during storage. The soluble solids content of all treated fruit was not significantly different during storage of 90 days, but that of CaCl_2+amino acid treated fruit was higher in 180 days of storage. The acidity was maintained at higher level in CaCl_2+phytic acid and CaCl_2+wood vinegar treated fruit in 180 days of storage.