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Understanding vermicompost and organic manure interactions: impact on toxic elements, nitrification activity, comammox Nitrospira inopinata, and archaea/bacteria

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Abstract

Vermicompost is a substantial source of nutrients, promotes soil fertility, and maintains or increases soil organic matter levels. Potentially toxic elements (PTEs) in vermicompost impact on nitrification activity. However, it is yet unknown how vermicompost affects nitrifying bacteria and archaea, comammox Nitrospira inopinata (complete ammonia oxidizers), net nitrification rates (NNRs), and PTEs. The effects of vermicompost application on NNRs, potential nitrification rates (NPs), PTEs, and the abundances of comammox N. inopinata bacteria, nitrite-oxidizing bacteria (NOB), and ammonia-oxidizing bacteria (AOB)/archaea (AOA) were studied. NNRs and NPs were significantly higher (p < 0.05) in fresh cow-dung vermicompost (stored for 40 days) as compared with other organic manure. The level of PTEs (Cu2+, Fe2+, Pb2+, Cd2+, and Zn2+) was significantly lower (p < 0.05) in vermicompost as compared with compost of waste material with Trichoderma and cow dung. Comammox N. inopinata, NOB, AOB, and AOA were significantly higher (p < 0.05) in stored cow-dung vermicompost (more than 1 year) as compared with other organic manure. The results of the scatterplot matrix analysis suggested that Fe2+, total nitrogen (TN), soil organic carbon (SOC), and total carbon (TC) were linearly correlated (p < 0.001) with NNRs and NPs in vermicompost and organic manure. Similarly, comammox N. inopinata bacteria, NOB, AOB, and AOA were linearly correlated (p < 0.001) with NNR and NP. These results indicated that vermicompost promoted nitrification activity by increasing microbial diversity and abundance, supplying nutrients and organic matter for microbial growth, and facilitating complex microbial interactions. It may be concluded that the influence of vermicompost, which played a great role in PTE concentration reduction, increased chemical, and biological properties, increased the growth rate of nitrifying bacteria/archaea and the nitrogen cycle.

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Funding

The University Grant Commission (UGC), Bangladesh, provided some partial funds (Fund no: 141/Edu/IU-2023/694).

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N.H. (Nazmul Huda), M.R.R. (Md. Rasel Rana), and M.M.R. (M. Mizanur Rahman) conceptualized and planned the study, carried out the analysis, and wrote the manuscript. M.R.R. and M.M.R. created the graphs and illustrations. M.A.H. (Md. Amdadul Huq), A.A. (Abdullah Al-Mamun), S.T.R. (Shabiha Tasbir Rahman), and M.K.A. (Md. Khasrul Alam) contributed to the critical revision and wrote the manuscript. M.M.R. oversaw the entire project, and all authors gave their approval to the final manuscript.

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Correspondence to M. Mizanur Rahman.

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Huda, N., Rana, M.R., Huq, M.A. et al. Understanding vermicompost and organic manure interactions: impact on toxic elements, nitrification activity, comammox Nitrospira inopinata, and archaea/bacteria. Environ Monit Assess 196, 355 (2024). https://doi.org/10.1007/s10661-024-12491-8

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