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Yield Response of Corn to Crowding Stress

^a Dep. of Plant, Soil, and Insects Sci., Univ. of Massachusetts, Amherst, MA 01003-9294
^b Dep. of Agron. and Range Sci., Univ. of California, Davis, CA 95616-8515

View larger version (19K): [in a new window]   Fig. 1. Effect of plant density and removal on total grain yield for three corn hybrids. R0, R1, R2, and R3 are no removal and removal of alternate plants at vegetative, tasseling, and early grain-filling stages of growth, respectively. Data points represent plant densities after thinning. Results are average of 2 yr except for 2000. L, Q, and NS represent linear, quadratic, and nonsignificant response, respectively. **Significant at P = 0.01.

View larger version (19K): [in a new window]   Fig. 2. Effect of plant density and removal on biomass yield for three corn hybrids. R0, R1, R2, and R3 are no removal and removal of alternate plants at vegetative, tasseling, and early grain-filling stages of growth, respectively. Data points represent plant densities after thinning. Results are average of 2 yr except for 2000. L and Q represent linear and quadratic response, respectively. *Significant at P = 0.05; **Significant at P = 0.01.

View larger version (19K): [in a new window]   Fig. 3. Effect of plant density on harvest index for three corn hybrids. Results are average of 2 yr except for 2000. L and Q represent linear and quadratic response, respectively. *Significant at P = 0.05; **Significant at P = 0.01.

View larger version (25K): [in a new window]   Fig. 4. Effect of plant density on ear yield components as a proportion of isolated plants for three corn hybrids. Results are average of 2 yr except for 2000. All lines shown were significant with linear trends (P = 0.01).

View larger version (21K): [in a new window]   Fig. 5. Effect of plant density and removal on ear number per plant for three corn hybrids. R0, R1, R2, and R3 are no removal and removal of alternate plants at vegetative, tasseling, and early grain-filling stages of growth, respectively. Data points represent plant densities after thinning. Results and significant trends are average of 2 yr except for 2000. L, Q, and NS represent linear, quadratic, and nonsignificant response, respectively. Significant at P = 0.05; **Significant at P = 0.01.

View larger version (22K): [in a new window]   Fig. 6. Effect of plant density and removal on kernel number per row for three corn hybrids. R0, R1, R2, and R3 are no removal and removal of alternate plants at vegetative, tasseling, and early grain-filling stages of growth, respectively. Data points represent plant densities after thinning. Results and significant trends are average of 2 yr except for 2000. L, Q, and NS represent linear, quadratic, and nonsignificant response, respectively. Significant at P = 0.05; **Significant at P = 0.01.

View larger version (24K): [in a new window]   Fig. 7. Effect of plant density and removal on average kernel weight for three corn hybrids. R0, R1, R2, and R3 are no removal and removal of alternate plants at vegetative, tasseling, and early grain-filling stage of growth, respectively. Data points represent plant densities after thinning. Results and significant trends are average of 2 yr except for 2000. L, Q, and NS represent linear, quadratic, and nonsignificant response, respectively. Significant at P = 0.05; **Significant at P = 0.01.