Abstract
The rate, application method and (or) combination of herbicides, with or without cultivation for soybean production, were studied during several years at Ridgetown and Woodslee, Ontario. One cultivation combined with a herbicide application at reduced rates of metribuzin (e.g., 0.42 kg a.i. ha−1) not only provided effective weed control but also maintained reliable economic return over the years. When used alone, however, neither of them provided satisfactory results. The success of a given weed management system appeared to depend on temporal and spatial environmental variations. In years of adequate rainfall, neither cultivation nor herbicide treatment significantly enhanced the soybean yield or economic return at Woodslee, despite greater weed control than with plots receiving no herbicide or cultivation. Thus, weed control is probably more critical in years of sub-favourable growth conditions than in years of favourable growth conditions. Key words: Cultivation, efficacy, economy, herbicide, reliability, soybean, Glycine max
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