不同浓度双氰胺对土壤铵态氮变化的影响

利用３ 个不同土样在实验室内进行不同浓度双氰胺（ＤＣＤ） 对土壤ＮＨ４ Ｎ 含量变化影响的模拟试验，得出在不同土壤上施用普通碳酸氢铵（ 以下简称普通碳铵） 添加ＤＣＤ 的最佳浓度。结果表明：添加ＤＣＤ 各处理的土壤ＮＨ４ Ｎ 含量均高于只施普通碳铵的处理；在紫色土、潮土和黄壤上添加ＤＣＤ抑制ＮＨ４ Ｎ 损失和转化的效果分别以０－５ ％ 、０－３ ％ 、０－３ ％ 浓度为最佳。

Different Consistence DCD Influence on the Transformation of NH4-N in Soil

Through the simulating experiment that different consistence of DCD (dicyandiamid) influence on the transformation of NH 4 N (ammonium nitrogen) with there different soil samples in lab, the paper gets the optimal consistence of adding the DCD while the general NH 4HCO 3 are used in different soils. The result indicates that the content of NH 4 N in the treatments adding the DCD is more than those only using the NH 4HCO 3; The consistence of 0 5%, 0 3%, 0 3% is optimal respectively when the DCD is added in order to both hold up the loss and accelerate the transformation of NH 4 N in Purple, Yellow Soil and Aquent.