Fig. 1. Relationship between N-deficiency stress [(grain yield at HN - grain yield at LN)/grain yield at HN] and the coefficient of genotypic correlation (for Exp. 5, 6, and 20, coefficients of phenotypic correlation) between grain yield at high and low N levels. The 21 experiments are numbered as in Table 1. Regression line is shown with its 95% confidence interval (R² = coefficient of determination of regression).

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