Exogenous carbon inputs alleviated salt-induced oxidative stress to cotton in salinized field by improving soil aggregate structure and microbial community.

3.2 Effects of exogenous carbon addition on antioxidant defense system in cotton 3.2.1 Malondialdehyde content and peroxidase activity Under the conditions without straw and biochar incorporation, the MDA content and POD activity of cotton leaves increased with the increase of soil salinity, and showed an increasing trend with the growth of cotton, reaching the peak at the bolling stage.

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However, the CAT activity of the S1CK, S2CK, and S3CK treatments showed a trend of increasing first and then decreasing, reaching the peak at the flowering stage (increasing by 56.50% − 58.62% compared with that of the budding stage).

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