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. 2022 May 9;13:870413. doi: 10.3389/fmicb.2022.870413

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Copyright © 2022 Wang, Zhang, Huang, Guo, Song, Zhang, Long, Wang and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effects of urea, KH₂PO₄ and NPK on the growth and siderophore production of AS19. (A) Siderophore production at different concentrations of urea. (B) The growth curve at different concentrations of urea. (C) Siderophore production at different concentrations of KH₂PO₄. (D) The growth curve at different concentrations of KH₂PO₄. (E) Siderophore production at different concentrations of NPK compound fertilizer. (F) The growth curve at different concentrations of NPK compound fertilizer (ns, no significant difference, *p < 0.05, **p < 0.01, ***p < 0.001).