Yield Performance of Nonprolific and Prolific Maize Hybrids at Six Plant Densities1
- C. L. Prior and
- W. A. Russell2
Grain yield response of nonprolific and prolific Corn Belt maize (Zea mays L.) single-cross hybrids to plant densities from 20,500 to 72,000 plants/ha were investigated. Four types of hybrids, each type including seven hybrids, were grown at six plant densities in eight environments (two locations in four years). The hybrid types were: type 1, elite, nonprolific; type 2, first-cycle, prolific; type 3, second-cycle or elite, prolific; and type 4, crosses between elite, nonprolific, and first-cycle, prolific parental lines. Types 1 and 3 had the highest average yields (86.5 and 89.7 q/ha, respectively) over all densities and environments and were not significantly different. Type 2 (76.3 q/ha) and type 4 (80.0 q/ha) yielded significantly less than types 1 and 3. Elite, prolific hybrids (type 3) yielded more uniformly over the range of densities (b1 = 0.33) than did the elite, nonprolific hybrids (type 1, b1 = 2.00). Types 2 and 4 were intermediate in response (b1 = 1.08 and 1.73, respectively). The extent of prolificacy at the various densities probably was the most important factor in explaining responses of the types.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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