The results showed: fertilization could increase the content of humus, decrease E4/E6, and improve the degree of complexity of humic acid molecule.
结果表明：通过施肥提高腐殖质的含量同时能降低胡敏酸E4/E6值，增加了胡敏酸分子的复杂程度。
2
Application organic fertilizer for long time can improve the content of humus, and inorganic fertilizer can enhance the content of Fulvic acid, decrease the content of humic acid.