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为了测定土壤中的水解性氮,过去用各种浓度的NaOH或H_2SO_4处理土壤.提出部分不仅包括土壤中的矿物态氮,而且也包括一部分易于矿化的有机态氮,主要是氨基酸类的物质.这部分易分解的有机氮的测定值一般小于培养法或同位素吸收法的值.但如果某一种提取法的一系列测定结果和任一与作物生长有关的方法(如作物生长反应、作物吸收氮量、同位素吸收法、矿化率法等)的结果之间有良好的相关性,则可以认为该提取法的结果与土壤有效性氮量成一定的比例关系,这就可以作为土壤氮的一个相对指标来应用.
In order to determine hydrolyzable nitrogen in soil, soil was treated with various concentrations of NaOH or H 2 SO 4 in the past, and proposed that it not only include mineral nitrogen in the soil, but also some easily mineralizable organic nitrogen, mainly amino acids The measured value of this partially decomposable organic nitrogen is generally less than that of the culture or isotope absorption method, but if the results of a series of determinations by one extraction method and any of the methods related to crop growth (eg, crop growth response, crop Absorption of nitrogen, isotope absorption, mineralization rate, etc.), the results of this extraction method can be considered as a certain proportional relationship with soil available nitrogen, which can be used as soil nitrogen A relative indicator to apply.