Resistance of Protein–Lignin Complexes, Lignins and Humic Acids to Microbial Attack

  title={Resistance of Protein–Lignin Complexes, Lignins and Humic Acids to Microbial Attack},
  author={D. L. Lynch and Cecil C. Lynch},
THE mechanism whereby organic matter, especially the protein moieties, is protected from rapid and complete break-down in soils is not fully understood. The interaction of clay minerals and organic materials with a resultant attenuation in breakdown of these substrates has been reported by a number of workers1. These proposed clay–organic complexes have much to commend them, but they fail to account for a core of resistant organic matter also found in soils which are low in clay minerals. This… 
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By advanced solid-state NMR spectroscopy, significant amounts of amide nitrogen directly bonded to aromatic rings in a humic acid fraction extracted from a continually submerged, triple-cropped rice soil are detected, which can explain the yield decline.
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