树脂膜测定氮肥在不同酸度黑土的铵态氮变化

采用阳离子交换树脂膜对3种肥料(尿素、硫酸铵、氯化铵)5种pH值(5、5.5、6、6.5、7)黑土中的NH4+-N进行提取研究。结果表明,3种肥料铵态氮释放速率在施肥后35 d内增加较慢,在施肥后35～49 d速率增加最快,尿素相对于硫酸铵、氯化铵速率增加较慢;用该方法提取铵态氮在土壤中的累计释放量也是在35 d内增加较慢,在施肥后35～42 d累计量增加较快,在42 d以后累计量增加最快;以施尿素的铵态氮累计提取量在各酸度土壤中最小,施硫酸铵的铵态氮累计提取量除在pH5.5黑土外都为最大;施尿素铵态氮提取量随土壤pH值增大而减小。

Assessment of ammonium nitrogen changes of nitrogen in different acidity black soil by resin membrane

Studied on the extraction of ammonium nitrogen from three kinds of fertilizer (urea, ammonium sulphate and ammonium chloride) and five acidity black soil by cation exchange resin membrane. The results showed that the ammonium nitrogen-release rates of three kinds of fertilizer slower increased during the first 35 days,but it increased fastest in 35-49 day. The ammonium nitrogen-release rates of urea were slower than ammonium sulfate and ammonium chloride.The release accumulation of ammonium nitrogen in black soil was slower in the fist 35 days, increased rapidly in 35-42 day,and increased fastest after 42 days. The minimum release accumulation of ammonium nitrogen in acidity black soil was urea application and the maximum was ammonium sulphate application except in ph 5.5 black soil. The release accumulation of ammonium nitrogen decreased with the increase of soil ph with urea application.