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The ANOVA results and photosynthetic rate and leaf area index at early flowering stage under different soil salt-ion concentration. (a,c): photosynthesis rate during 2019–2020 and 2020–2021 growing seasons; (b,d): leaf area index during 2019–2020 and 2020–2021 growing seasons. LSSC and HSSC represent low and high soil salt-ion concentration. Different letters indicate significant difference at p = 0.05 between different treatments. Data are mean ± SE (n = 3).
