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Response of Maize and Soybean to Variability in Stand Uniformity

Unidad Integrada INTA Balcarce, Facultad de Ciencias Agrarias UNMP, CC276, 7620 Balcarce, Buenos Aires, Argentina

View larger version (21K): [in a new window]   Fig. 1. Relationship between yield per plant and vegetative biomass per plant for (A) soybean cultivar A3901 and (B) maize hybrid DK752. Parameters of Eq. [3] fitted to soybean data were a = –0.47 and b = 1.09 (R2 = 0.970). Parameters of Eq. [1] fitted to maize data were a = 1.42, b = 18.57, c = 0.0012, and d = 196.0 (R2 = 0.965). Each point represents one plant.

View larger version (16K): [in a new window]   Fig. 2. Relationship between grain yield per plant (Yp) and percentage coefficient of variation (CV) for vegetative biomass per plant (Vp) in (A) soybean and (B) maize. Control (circles), temporal nonuniformity (squares), spatial nonuniformity (triangles), and temporal and spatial nonuniformity (diamonds) treatments are indicated. Data are from Exp. 1, 2, and 3 for maize and Exp. 4 for soybean. Each point represents one experimental unit. For soybean: y = –0.007x + 10.7 (r = 0.045; ns); for maize, y = –0.68x + 165.9 (r = 0.53 p < 0.01). Plant densities were 40 and 8 plants m–2 for soybean and maize, respectively.

View larger version (16K): [in a new window]   Fig. 3. Relationship between estimated and observed mean plant yield (Yp) for (A) soybean and (B) maize. The Yp values of all experimental units from Exp. 1, 2, and 4 were estimated with Eq. [4]. The linear equation fitted to the data was y = 0.39 + 0.992x (R2 = 0.87) for soybean and y = 7.48 + 0.987x (R2 = 0.70) for maize. The dotted line represents the one-to-one relationship.

View larger version (13K): [in a new window]   Fig. 4. Estimated relative yield per plant (Yp) as a function of percentage coefficient of variation for vegetative biomass (CV) for soybean cultivar A3901 (circles) and maize hybrid DK752 (squares). Values were estimated according to Eq. [4]. Average vegetative biomass per plant (Vp) was assumed to be 10 and 150 g plant–1 for soybean and maize, respectively.

View larger version (11K): [in a new window]   Fig. 5. Yield per plant as a function of vegetative biomass per plant for: (A) two soybean cultivars, according to Eq. [3], A3901 (solid line, a = –0.47, b = 1.1; R2 = 0.97) and A3205 (broken line, a = 2.5, b = 1.5; R2 = 0.95) and (B) two maize hybrids, according to Eq. [1], DK752 (solid line, a = 1.42, b = 18.57, c = 0.0012, and d = 196.0; R2 = 0.97) and M400 (broken line, a = 2.42, b = 41.87, c = 0.0116, and d = 241.5; R2 = 0.82).