早在60年代Confield首先提出用NaOH扩散法测定土壤中的碱解氨含量,我们在此基础上,于1972～1974年曾通过田间试验及同位素盆栽试验研究,进一步证实这一方法的可行性。与此同时,对该法作了一些改进,使其与田间试验和同位素盆栽试验结果之间的相关性更为满意。但应用此法测定的土壤速效氮尚不包括NO_3~--N在内,因此应用此法测定旱地土壤的速效氮,其结 As early as in the 1960s, Confield first proposed using NaOH diffusion method to determine the content of alkali-hydrolyzed ammonia in soil. Based on this, we conducted field experiments and isotope pot experiments in 1972-1974 to further confirm the feasibility of this method. At the same time, some improvements have been made to the law to make it more relevant to the correlation between field trials and isotopic pot test results. But using this method to determine soil available nitrogen does not yet include NO_3 ~ - N, so this method is used to determine available nitrogen in dryland soil, the knot