Structural characteristics of humic substances in buried ancient paddy soils as revealed by <sup>13</sup>C NMR spectroscopy.

Environ Geochem Health · 2019 · PMC6856294 · PMID 31016606

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an increasing trendno p-value reported

With the increase in the soil depth, the two groups of paddy soils showed an increasing trend in the HA/FA ratio.

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