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. 2015 Jul 20;5:12174. doi: 10.1038/srep12174

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(A) and P (B) by H. ammodendron and H. persicum (as percentage of their total supply) in relation to the fraction of the root biomass investment by these species in the competition pots. Linear regression for N, R² = 0.69 and P < 0.01; and for P, R² = 0.50 and P < 0.01.