VOLATILIZATION OF AMMONIA FROM UREA-AMMONIUM NITRATE SOLUTIONS AS INFLUENCED BY ORGANIC AND INORGANIC ADDITIVES

被引：14

作者：

ALKANANI, T ^{[1
]}

MACKENZIE, AF ^{[1
]}

BLENKHORN, H ^{[1
]}

机构：

[1] NITROCHEM INC,MONTREAL H3A 2M8,QUEBEC,CANADA

来源：

FERTILIZER RESEARCH | 1990年 / 23卷 / 02期

关键词：

Nitrification inhibitor; urea hydrolysis inhibitor;

D O I：

10.1007/BF01063338

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Fertilizers containing urea can suffer from nitrogen (N) loss through ammonia volatilization, resulting in reduced effectiveness of the fertilizers. The loss of N may be reduced by use of organic or inorganic additives. Laboratory experiments were conducted on surface soil samples (0-15 cm) from two agricultural soils (St. Bernard and Ste. Sophie) to determine the impact of ammonium thiosulfate (ATS), boric acid, and a humic substance from leonardite, on NH3 losses from surface-applied urea-ammonium nitrate (UAN) solutions. Experiments were carried out using moist soil samples in closed containers. Evolved NH3 was carried out of the containers and trapped in boric acid solution using an ammonia-free humidified air flow. Total NH3 losses in these experiments ranged from 12.1 to 21.3% of the N applied. The reduction in NH3 volatilization (expressed as % of added N) due to additives ranged from 13.6 to 38.5% and 3 to 36.3% in St. Bernard and Ste. Sophie soils, respectively. More NH3 volatilized from the boric acid or humic treated UAN solutions than from ATS-UAN solutions. Boric acid, ATS, and the humic substance, all significantly reduced urea hydrolysis in both soils in comparison to the untreated UAN solution. Further, the humic substance and boric acid treatment induced significant reduction in NO3-formation. The results suggest that humic substance and to a lesser extent boric acid may function as urease and/or nitrification inhibitors. ATS treatment, particularly at higher levels increased NO3-formation in both soils. The reason for this increase in nitrate formation is not clear. © 1990 Kluwer Academic Publishers.

引用

页码：113 / 119

页数：7

共 29 条

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