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. 2010 Mar 25;61(9):2303–2315. doi: 10.1093/jxb/erq057

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© 2010 The Author(s).

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

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Fig. 2. — Fresh weight of barley plants (cv. Antonia) cultivated at various K⁺ and NH₄⁺ concentrations. Plants were grown in a greenhouse in hydroponic medium with all nutrients including 1.5 mM NO₃⁻ as nitrogen source but without NH₄⁺ or K⁺ for 3 d and subsequently transferred for 5 d to various K⁺ and NH₄⁺ concentrations as indicated. Black bars represent root weight; white bars represent shoot weight, with old leaves (bottom), young leaves (middle), and stem (top). Data represent means ±SE of 12 plants for each measurement.