To investigate the effect of foliar spraying of chelated calcium and shading net on the metabolic characteristics,fruit cracking,and quality of greenhouse spring delay tomatoes,the tomato variety Youpin88 was treated at four treat-ments,as CK(unshading+clear water foliage spraying),CC(unshading+0.30 g·L-1 chelated calcium foliage spraying),S(shading+clear water),and SCC(shading+0.30 g·L-1 chelated calcium).The results showed that the fruit cracking rate of tomato during the color changing and red ripening stage was SCC＜S＜CC＜CK,and there were significant differ-ence among the treatments.Compared with CK,CC and SCC significantly increased the activities of superoxide dis-mutase and ascorbate peroxidase in fruit peels,while reducing the content of malondialdehyde and H2O2.CC,S and SCC significantly decreased the activity of cell wall hydrolases in fruit peel cells.The content of cellulose and pectin in the fruit peel showed a trend of SCC＞S＞CC＞CK,and SCC showed significant difference compared to the other treatments.Both CC and SCC significantly improved the single fruit mass,vitamin C,and soluble solid content of the fruit,with SCC treatment better.In summary,the synergistic effect of chelated calcium and shading net is the most effective in increasing yield and improving quality in greenhouse tomato production.
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