不同化学方法测定的土壤有效氮结果与各有机氮组分关系不一。
The relationships between available nitrogen values determined by various chemical methods and different organic nitrogen components were different.
木质素的甲氧基、羧基含量与总氮、有效氮含量均呈较好的线性关系。
The contents of methoxyl and carboxyl groups have good linear relationships between the contents...
研究了北方寒冷地区秸秆的快速腐解过程中有效氮保护的方法，寻找切实可行的途径。
We research on method of effective nitrogen protection in quick decomposition of straw in frigid area, and provide feasible approach.
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