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. 2018 Sep 26;19(10):2924. doi: 10.3390/ijms19102924

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Effects of phosphorus (P) deficiency on soybean nodule growth. (a) Phenotype of soybean nodules at two P levels. (b) Soybean fresh weight. (c) Nodule number. (d) Nodule size. (e) Nodule nitrogenase activity. Data in the figure are mean of four replicates with standard error bars. Asterisks indicate significant difference between HP (500 μM KH₂PO₄) and LP (25 μM KH₂PO₄) treatments in the Student’s t-test (*: p < 0.05). Bars = 1 cm.