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a, b, Results for multiple linear regression models using non-standardized predictor variables. a, Results of a regression using effective crop group diversity (n = 437). b, Results of a regression using effective crop species diversity (n = 437). AIC, Akaike information criterion; R2, Spearman correlation coefficient; SE, standard error. Yield stability, μ and σ were log-transformed and the rate of nitrogen fertilization and irrigation were square-root (sqrt)-transformed. *P < 0.05; **P < 0.01; ***P < 0.001.