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Root length density in the topsoil and subsoil layers for CW134, CH58 and CH1 in the rhizobox experiment at (A,B) stem elongation and (C,D) maturity under (A,C) moderate drought stress (MD) and (B,D) well-watered (WW) conditions. Different letters in the same growth period imply a significant difference at P < 0.05. Horizontal bars represent + one standard error of the mean (n = 3).
