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Relative soil water content at different growth stages under different drip irrigation treatments during 2016–2017 (A) and 2017–2018 (B) growing season. Vertical bars represent standard errors (n = 4). Different lowercase letters above the bars in the same growing stage are significantly different among different treatments at P < 0.05. The 0.25, 0.4, 0.6, 0.8, and 1.0 ETc represents 25, 40, 60, 80, and 100% crop evapotranspiration, respectively.
