Effects of bagging with calcium treated paper bag on calcium contents and quality in 'Niitaka' pear fruit

摘要

The effects of bagging with three-layer newspaper bag and calcium coated two-layer yellow bag on the physical characteristics of bag and calcium contents and quality in 'Niilaka' pear fruit were studied. The light transmitiance and tear resistance ofcalcium-coated bag were Ihe same as non-treated control. Water soluble calcium of inner bag was maintained until the 115 days after bagging. The concentration of total-N, P, K, and Mg in fruit peel at harvest showed no significant difference. The calcium contents of flesh was increased by calcium-coaled bag 75 days after bagging. Most of the calcium recovered from fruit flesh was water soluble. Calcium-coated bag did not affect the concentration of soluble solids and fruit skin color, but increased fruit firmness at harvest. Also, appearance of fruit skin in three-layer bagging and the control were less attractive than calcium-coated two-layer yellow bagging.