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华北农学报 1993

ModifiedConwayMethodforsoilavailablenitrogentesting

DOI: 10.7668/hbnxb.1993.S2.019, PP. 106-109

于增寿,黄德明

Keywords: soil,availablenitrogen,ConwayMethod,Devard'salloy,reaction

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Abstract:

TheidealreducingreagentintestingavailablenitrogenofsoilbyConwayMethodisDevard'salloy.Theoptimumratioofsoil:Devard'salloy:1.0NNaOHsolutionis5.0g:0.2g:5ml.Whenreactiongoesonat30℃for4hours,therateofsoilNO3-Nreductionisabout90%,andtherecoveryrateofsoilNH4-Nisabout95%.Someorganicnitrogencanbemeasuredatthesametime.ThismethodisdefinedastheModifiedConwayMethodandthesoilN-minisr=0.982（n=10）.Inpredictingsoilnitrogensupplyingpower,theModifiedConwayMethodtakesonly1/6oftimeneededbyConwayMethod.TheModifiedConwayMethodcanalsobeusedforthemeasureofsoilN-min.

References

[1]

Cornfield AH. (1960) Ammonia released on treating soils with 1N NaOH as a possible means of predicting the nitrogen supplying power of soil. Nature. 187:260 Fang Zhangfa. (1987) Selection of reducing reagents for testing soil available nitrogen by use of diffusion method. Journal of Zhejiang Agricultural Sciences, 4，168 Nanjing Soil Research Institute. (1987) Soil Physicochemical Analyses. Shanghai Science Press，p. 78

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