一、历史回顾及早期研究土壤速效钾的测定方法早在19世纪末就开始被提出来,已有近百年历史。研究方法种类繁多,有生物的,化学的及物理化学的等。为了使有关的研究工作者对此有较为全面的了解,本文拟从历史发展角度把这一庞杂而繁复的问题作初步整理加以扼要介绍,而把重点放在近期发展方面。 First, historical review and early research Soil available potassium determination method as early as the late 19th century has been put forward, nearly a hundred years of history. A wide range of research methods, biological, chemical and physical and chemical and so on. In order to make the relevant researchers have a more comprehensive understanding of this, this article intends to make a brief introduction of this complicated and complicated issue from the perspective of historical development, with a focus on the recent development.