PNAS -- Li et al. 104 (27): 11192 Figure 2

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Fig. 2. Visualization of rhizosphere acidification of faba bean (a), soybean (b), and maize (c). The roots were imbedded for 6 h in agar gel containing a pH indicator (bromocresol purple) without P supply (Greenhouse Study 2). Yellow indicates acidification, and purple indicates alkalization.