摘要： The ideal reducing reagent in testing available nitrogen of soil by Conway Methodis Devard's alloy.The optimum ratio of soil:Devard's alloy:1.0N NaOH solution is 5.0g:0.2g:5ml.When reaction goes on at 30℃ for 4 hours,the rate of soil NO3-N reduction is about 90%,and the recovery rate of soil NH4-N is about 95%.Some organic nitrogen can be measured at thesame time.This method is defined as the Modified Conway Method and the soil N-min is r=0.982（n=10）.In predicting soil nitrogen supplying power,the Modified Conway Method takesonly 1/6 of time needed by Conway Method.The Modified Conway Method can also be used forthe measure of soil N-min.
关键词:
soil,
available nitrogen,
Conway Method,
Devard's alloy,
reaction
于增寿, 黄德明. Modified Conway Method for soil available nitrogen testing[J]. 华北农学报, 1993, 8(S2): 106-109. doi: 10.7668/hbnxb.1993.S2.019.
Yu Zengshou, Huang Deming. [J]. ACTA AGRICULTURAE BOREALI-SINICA, 1993, 8(S2): 106-109. doi: 10.7668/hbnxb.1993.S2.019.