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This document describes a set of biochemical parameters allowing the measurement of sublethal effects in higher plants exposed to soil pollutants and other stressors (e.g. drought, nutrient availability, heat stress). This document is applicable to soils of unknown quality (e.g. from contaminated sites, amended soils or soils after remediation), following laboratory exposure assays. This document specifies methods for measuring antioxidant defence enzyme activities that indicate stress symptoms in the leaves of lettuce and higher plants, either monocotyledonous or dicotyledonous species.