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. 2022 May 16;12(5):444. doi: 10.3390/metabo12050444

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Effect of various applied NH₄⁺/NO₃⁻ ratios (100:0, 75:25, 50:50, 25:75 and 0:100%) and control (no additional N applied) on different amino acid contents of lettuce grown in soil, substrate and hydroponic cultivation systems. Note- The means (n = 4) ± standard errors are shown in the data. Different letters (a–d) show significant difference (p = 0.02) among applied NH₄⁺/NO₃⁻ ratios (100:0, 75:25, 50:50, 25:75 and 0:100%) and control in lettuce grown in soil, substrate and hydroponic cultivation systems.