腐殖物质 meaning in English

humic matter
humic substances
humus substance

Ultimate analysis provides an useful inventory of the distribution of the major elements in humic substances .
元素分析提供腐殖物质中主要元素分布的有用资料。
Component of soil humic substances in larch plantations and its effects on soil acidity
落叶松人工林土壤腐殖物质组分及其对酸度的影响
Desert and oasis ecosystem are the main ecosystems in arid area . studying the characteristics of decaying process , decaying remainders and soil humic acids can accumulate the first hand data for studying the accumulation and decomposition of soil organic matter , the situation of soil fertility , substance cycling and energy flowing in desert - oasis ecosystem , and has the great significance on desert ecosystem restraint and oasis ecosystem extension
研究荒漠绿洲生态系统中植物残体在土壤中的腐解过程及腐解物和腐殖物质的特征，可为研究荒漠绿洲生态系统中土壤有机质的累积和分解、土壤肥力状况和荒漠绿洲生态系统的物质循环和能量流动积累宝贵的第一手资料，对于抑制荒漠生态的恶化，促进绿洲生态的发展具有重要意义。