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Seed Number as a Function of Growth. A Comparative Study in Soybean, Sunflower, and Maize

Unidad Integrada INTA Balcarce - Facultad de Ciencias Agrarias UNMP. CC 276, 7620 Balcarce, Argentina

View larger version (12K): [in a new window]   Fig. 1. Relationship between average seed number per plant at maturity and average plant growth rate during the critical period for seed set in Season I. Data obtained from nondestructive measurements (NDS) and from conventional plant sampling (CS). In maize, seed number per plant includes seeds in the uppermost and in the subapical ear. Bars indicate standard error of the mean.

View larger version (23K): [in a new window]   Fig. 2. Coefficient of variation of average seed number per plant at maturity and average plant growth rate during the critical period for seed set as a function of plant density in Season I. Number 2 indicates commercial densities (29.8, 5.8, and 8.5 in soybean, sunflower and, maize, respectively). Numbers 1 and 3 indicate low and high densities, respectively (Table 1).

View larger version (29K): [in a new window]   Fig. 3. Seed number per plant and plant growth rate during the critical period for seed set in soybean, sunflower, and maize individuals during two growing seasons at Balcarce. In Season I, symbols indicate plant densities (PD). Normal densities (D) were 29.8, 5.8, and 8.5 p m-2 in soybean, sunflower, and maize, respectively. Low PD was 0.25D and high PD was 2D. In maize, each point represents seed number in the uppermost ear of nonprolific and prolific plants, except when otherwise indicated. In maize, the fitted curve did not include seed from the second ear in prolific plants. Parameters of the fitted relationships are in Table 3.