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The report is the result of a survey undertaken to develop a series of acceptable test protocols for assessing the effects of chemicals on plants. Plant exposure to air, soil, and water contaminants were considered. Test species were selected on the basis of physiology, anatomy, importance as crops, and their susceptibility to chemicals. Bioassay methods were chosen because they are most representative of natural conditions. The recommended sequence of test procedures includes: growth chamber or laboratory testing, greenhouse testing, field plot testing, progeny testing and, finally, population studies in the ecosystem. It is suggested that the extent of testing should depend upon the quantity of the chemical to be manufactured and its potential hazard to the environment.