褐煤、腐殖酸、残余植物碎屑和地沥青等是现存有机质的主要类型。
Lignitous coal, humic acid, fragments of plant remnants and asphalt are main forms of existing organic substances.
利用活化后褐煤腐殖酸为吸附基质制成缓效肥料(NHA)，研究了其对盆栽杨树生长、土壤酶及理化性质的影响。
The poplar growth and soil enzymatic activity was studied as affected by humic acid fertilizer (NHA), which was made by activated brown coal.
试验研究了褐煤制磺化煤的制备方法及磺化温度、磺化时间、酸煤比等因素对产物磺化煤的离子交换活性的影响。
The preparation methods of sulfonated coal and factors such as sulfonation time, sulfonation temperature and ratio of acid to coal etc.
试验研究了褐煤制磺化煤的制备方法及磺化温度、磺化时间、酸煤比等因素对产物磺化煤的离子交换活性的影响。
The preparation methods of sulfonated coal and factors such as sulfonation time, sulfonation temperature and ratio of acid to coal etc.
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