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Fig. 3. Relationships between (a) harvest index and plant growth rate during a critical period for kernel set bracketed by silking (PGRS) and (b) kernel number and plant dry matter before silking for plants with PGRS equal to threshold for kernel set ±0.5 g plant–1 d–1 for four Argentinean maize hybrids. Equation harvest index (HI) = a + bx PGRS, if PGRS > PGRS threshold for kernel number was fitted to the relationship between HI and PGRS and R2 of the fitted equations ranked from 0.42 to 0.56 (Fig. 3a). Closed symbols represent plants with PGRS equal to threshold for kernel set ±0.5 g plant–1 d–1.
