土壤酸碱性是影响植物生长的重要因素之一。在林业生产中,往往根据土壤的pH值决定树种适生的土壤类型。在测定土壤pH的方法中,电位法的精度较高。混合指示剂比色法的精度较差,一般认为其误差在0.5个pH单位左右。关于我国常用的几种混合指示剂在使用上的问题和优缺点,袁可能和朱祖祥(1956)已作了研究。这项成果已反映在 Soil acid-base is one of the important factors that affect plant growth. In forestry production, the soil type is often determined by the soil pH. In the method of determining the pH of the soil, the accuracy of the potential method is high. Mixed indicator colorimetric accuracy is poor, the general view that the error is about 0.5 pH units. On the use of several mixed indicator commonly used in China problems and advantages and disadvantages, Yuan and Zhu Zuxiang (1956) have been studied. This result has been reflected in