Abstract
AbstractCultivar competition in wheat (Triticum aestivum L.) yield plots has been acknowledged for more than 50 years. However, measurements of the effects of possible interactions of cultivars and row spacings in two‐, four‐, and six‐row plots have not been investigated together in planned experiments. The objective of this study was to study the influence of two‐, four‐, and six‐row plots with 15‐, 20‐, 25‐, 30‐cm row spacings on the yield of a normal height wheat (‘Riley 67’) and a semi‐dwarf wheat (‘Sturdy’) in 4 ✕ 3 ✕ 2 factorial experiments. Marked cultivar ✕ rows per plot interactions indicated cultivar competition. The yield of Sturdy was linear function of rows per plot but the yield of Riley 67 was an inverse linear function. Sturdy plot yields were (i) larger than Riley 67's in six‐row plots, (ii) not different from Riley 67's in four‐row plots, and (iii) less than Riley 67's in two‐row plots. The data indicate that six‐row plots with 15‐, 20‐, 25‐, or 30‐cm row spacings are needed for valid yield evaluation in perennial experiments, but in annual experiments six‐row plots with 30‐cm row spacing should be used.
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