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Influence of high temperature stress and soil fertilization treatments on SOD, POD, CAT and APX activities in xylem sap of two rice cultivars. Error bars above means denote LSD of interaction at the 0.05 probability level. HHZ: Huanghuazhan (heat tolerant), IR-64 (heat susceptible). HDT: high day temperature, HNT: high night temperature, AT: ambient temperature (control)
