Selectivity of Nitrofen Between Cabbage Cultivars

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Abstract
Increasing herbicide selectivity between weeds and economic crops has facilitated row crop production with a decreasing demand for labor to be used for mechanical weed control. However, selectivity has been identified in several cases (1, 2, 3) to be of an intra-specific nature. Intra-specific selectivity by growth regulating compounds (i.e. herbicides) provides interesting academic concepts for more adequate physiological models (4, 5, 6) than inter-specific comparisons. The increased selectivity does creat problems in the use of herbicides in commercial production practices because several cultivars of a crop are usually available. Robinson (3) has suggested that with close selectivity and the rapid changing of cultivar utilization, inbred lines may be the most appropriate indicator plants to utilize in determining herbicide tolerances.

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