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. 2018 Jan 5;69(3):603–617. doi: 10.1093/jxb/erx441

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Fig. 2. — Effects of P availability on soybean root growth. Soybean seedlings were treated with +P (250 μM KH₂PO₄) or –P (5 μM KH₂PO₄). Data are means of four replicates ±SE. Asterisks indicate significant differences between the two P treatments: *P<0.05; ***P<0.001.