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Natural and artificial humic substances to manage minerals, ions, water, and soil microorganisms - Chemical Society Reviews (RSC Publishing) DOI:10.1039/D0CS01363C
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Figure 2 from Humic substances - compounds of still unknown structure: applications in agriculture, industry, environment, and biomedicine | Semantic Scholar
Humic Substances: Its Toxicology, Chemistry and Biology Associated with Soil, Plants and Environment | IntechOpen
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