Effect of Bagging with Different Paper Bags on Fruit Quality of Newhall Navel Orange

Six different types of paper bags were chosen for the study of the effect of bagging on fruit quality of Newhall navel orange(Citrus sinensis Osbeck).The results showed that the treatments of bagging with double-layer bag of brown outer and red inner,grey outer and red inner and yellow outer and black inner significantly increased the lightness,saturation and yellowness on the peel coloring of the fruit than the non-bagged control,whereas no distinctive change was induced by bagging.At the ripening stage,compared with the control,the content of carotenoids decreased by 12~49μg/g FW in all bagging treatments,chlorophyll content did not obviously vary,and fruit weight and acid content were reduced,respectively,by 8.9~83.6 g and 0~0.9%.Except for bagging with grey outer and red inner bag(0.2% improvement),other bagging treatments decreased the content of total soluble solid(TSS) by 0~1.3%.Vc content of the yellow outer and black inner treatment decreased sharply.The optimal bagging for the Newhall navel orange was chosen for double-layer bag of grey outer and red inner or brown outer and red inner.However,the double-layer bag of yellow outer and yellow inner was not suitable for the Newhall navel orange with the treatment of bagging.