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Effects of phosphate concentration in the root environment on cluster-root dry mass and percentage of cluster roots as compared with total roots based on dry mass in Lupinus species during 54 d in hydroponics. L. albus (A, B), L. atlanticus (C, D) and L. micranthus (E, F). Treatment means marked with the same lower-case letter are not significantly different within each group using a one-way ANOVA for each harvest followed by Duncan's multiple test (P < 0·05).
