测定土壤石灰需用量的方法甚多。本文应用测定土壤交换性酸的方法,以计算石灰需用量,并同时测定土壤的pH值,统计两者之间的相关性。实验结果表明,土壤pH值与石灰需用量之间呈极显著的负相关。故可通过测定土壤pH值以估算石灰需用量。鉴于目前国内生产的小型携带式的酸度计可在桔园田间任何一个土壤部位直接测定pH值, There are many ways to determine the amount of soil lime required. In this paper, the method of determining soil exchangeable acid was used to calculate the amount of lime required, and the pH value of the soil was measured simultaneously. The correlation between the two was calculated. The experimental results show that there is a significant negative correlation between soil pH and lime requirement. Therefore, by measuring the soil pH to estimate the amount of lime required. In view of the current domestic production of small portable acidity meter can be directly measured in the citrus field any one part of the soil pH,