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. 2022 Apr 21;13:863325. doi: 10.3389/fmicb.2022.863325

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Copyright © 2022 Jin, Jin, Wang, Li, Liu, Liu, Luo, Wu, Lyu and Yu.

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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Yield and quality parameters of lettuce grown in soils with different fertilization treatments. (A) Yield in 2019. (B) Yield in 2020. (C) Nitrate content of lettuce. (D) Vitamin C content of lettuce. (E) Soluble protein content of lettuce. (F) Soluble sugar content of lettuce. Values presented are the means ± SE (n ≥ 3). Vertical bars indicate the SE of the means. Different lowercase letters indicate significant differences among treatments at the same timepoint (Duncan’ s test, p < 0.05). CK, T1, T2, T3, and T4 are as defined in the Figure 1 legend.