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Sypnosis Substantial reduction of the variety‐location interaction affecting genotypic progress resulted from proper subdivision of Iowa into subregions, following a procedure described herein. For example, optimum subdivision into four parts resulted in a reduction of 30%. Implications with respect to a breeding program were briefly discussed. The data involved 9 locations, 5 years and oat varieties previously selected for wide adaptability.
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Horner et al. (1957) studied this question.