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a, b, Results for simple linear regression models using only non-standardized effective crop group diversity (n = 437) (a) and effective crop species diversity (b). c, d, Results show a complete model including the most important predictors of national yield stability as well as additional predictors. Yield stability was log-transformed and the rate of nitrogen fertilization, irrigation and country area were square-root-transformed. *P < 0.05; ***P < 0.001.