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. 2020 Apr 14;10:6432. doi: 10.1038/s41598-020-62669-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Activities of superoxide dismutase [SOD; (A)], catalase [CAT; (B)] and peroxidase [POD; (C)] in the leaves of maize plants grown under phosphorus and water deficiency stresses applied individually or in combination with or without soil amendments (SA1 and SA2). Mean ± S.E.; Mean pairs with different letters are significantly different (P < 0.05) by Duncan’s multiple range test. (C) Control treatment (Well-watered; plants were irrigated every day at 100% A pan (Epan) evaporation, and adequate P, 125 kg P/ha); PS: phosphorus deficiency stress (62.5 kg P/ha); WS: water stress (Plants were irrigated once every 3 days at 67% A pan (Epan) evaporation); NSA: No soil amendment; SA1: 625 kg sulfur (S) + 750 kg leonardite/ha; SA2: 1250 kg S + 37.5 kg/ha humic acid.