Fig. 2

Root hair length on first- and second-order lateral roots of two genotypes that had been grown for 45 days in 50-L containers filled with a highly P-deficient (P-fixing) soil. The soil was either maintained close to field capacity by daily addition of water or was allowed to dry by withholding water between days 23 and 42. Asterisks denote statistical significance for factor genotype at p < 0.01, based on Tukey’s HSD (ns = not significant).