Study on the Determination Method of Soil Alkali Hydrolysis Nitrogen
From three aspects, sodium hydroxide concentration, distillation rate and adding agent or not, to optimize the method to measure soil available nitrogen of kay type nitrogen determination apparatus and compared precision with diffusion dish method currently used. The results showed that: in the case of 3.5 mol/L sodium hydroxide solution, 60% of the distillation efficiency, and not adding reductant, the results of two methods is similar, and closes to the value of soil reference materials. But the precision of the kjeldahl definition is higher. Therefore, it is feasible to measure soil available nitrogen by the kjeldahl nitrogen determination apparatus, and it is more convenient and quicker than diffusion method.
Kay type nitrogen instrumentsoilalkali hydrolysis nitrogen