Fig. 5. Relationship between maize grain yield and rainfall from 30 d before to 20 d after flowering (W₄) in (A) 1987–1989, (B) 1994–1995, and (C) 1999–2000 seasons. The baseline function derived from Exp. [1] (1996–1998) is shown for comparison. Parameters of the fitted curves are (A) y = 3271 + 12.3x (P < 0.01); (B) a = 8205 ± 223, W₀ = 81.5 ± 34.9, and b = 28.2 ± 21.4 (P < 0.001); and (C) a = 10 905.52 ± 1054.6, W₀ = 17.2 ± 76.88, and b = 77.1 ± 75.4 (P < 0.01).