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(A) Total root length, (B) root surface area and (C) root tip number of H. vulgare, B. napus and S. tuberosum grown in nutrient solution at two levels of P supply (P1 = 1 μM P, P50 = 50 μM P). Plants were harvested after 28 days growth. Values are means ± SE of n = 6. Different letters indicate significant differences (P < 0.05) as shown by Tukey tests.
