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The Survey of Study of the Biological Mechanism of Humic Acid Formation

BIAN Wen hua (College of Life Science,Hebei Normal University,Shijiazhuang 050016,China)  
Details of seven key theories of humic acid formation.They are:“lignin proteins comp ound body”by waksman,“Microbe action”by weiliansi.“Microbe synthesis”“ced secf dissolving”,“Kenenewa's”,“Machanism of coal fermation” by enders and“anaerobie formentation”.
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