Effect of fruit bagging with different spectra bags on the growth and quality of tomato in spring-summer season

The effect of fruit truss/bagging with five different spectra bags on the micro-environment, fresh weight, yield, nutrition content and physiological disease of tomato fruit in spring-summer season was investigated. The results show that under bagging, light intensity significantly weakens, especially ultraviolet wave (< 400 nm)，while 400 ～ 600 nm radiation drops sharply in red plastic film bags (RFB).Relative humidity generally increases while temperature change is different in different bags. No significant differences in the rate of increase in fresh fruit weight, fruit rigidity, fruit shape, single fruit weight and fruit weight per truss (bag) exist. Fruit ripening is quickened and concentrated, and lycopene content increases but with no significant difference in vitamin C, free amino acids and soluble protein content after fruit bagging. Soluble solid content decreases significantly in fruits with fresh film bag (FFB)，while soluble sugar content reduces most significantly in fruits with RFB, yet that of organic acid decreases markedly in fruits with white plastic film bag (WFB). The number of deformed fruits, holed fruits and black-scar fruits decreases while cracked fruits increase and stalk-enlarged fruits appear in fruit bagging treatments. It is concluded that bagging of fruits in spring-summer season is beneficial to the growth and ripening of tomato fruit. The types of bag most suitable include purple plastic film bag (PFB) followed by WFB.