Modification of the Conway Method for Soil Available Nitrogen Testing

doi:10.3321/j.issn:1000-7091.1990.04.014

Abstract

Abstract: The ideal reducing agent in soil available nitrogen tests by Conway Method is Devarda alloy. The optimum ratio of soil : Devarda alloy : 1.0 N NaOH solution is 5. 0g : 0.2g: 5 ml. When reaction goes on at 30℃ for 4 hours, the rate of soil N-NO3- reduction is about 90%, and the recovery rate of soil N-NH4 is about 95%. Some organic nitrogen can be measured at the same time. This method is defined as the Modified Conway method. The correlation between the value of soil available nitrogen determined by the Modified Conway Method and the soil N-min is r= 0.982 (n=10). Better in predicating soil nitrogen supplying power, the Modified Conway Method takes only 1/6 the time needed by the Conway Method. The Modified Conway Method can also be used for the measure of soil N-min.

Key words: Soil, Available nitrogen, Conway method, Devarda alloy reduction

Yu Zengshou, Huang Deming. Modification of the Conway Method for Soil Available Nitrogen Testing[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1990, 5(4): 83-87. doi: 10.3321/j.issn:1000-7091.1990.04.014.

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