A computer‐assisted method for CEC estimation and quality control in a routine soil‐test operation
作者:
N. V. Hue,
C. E. Evans,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1983)
卷期:
Volume 14,
issue 8
页码: 655-667
ISSN:0010-3624
年代: 1983
DOI:10.1080/00103628309367397
出版商: Taylor & Francis Group
关键词: Electronic interface;FORTRAN language;buffer pH;extractable cations;ion ratio
数据来源: Taylor
摘要:
Cation‐exchange capacity (CEC) of 30 Alabama soils was estimated by two different methods based or routine soil‐test results consisting of soil‐water pH, Adams‐Evans buffer pH, and Mehlich‐1 extractable cations (K, Mg, and Ca), which were obtained automatically by a computerized data acquisition system. In one method, CEC was calculated by solving a quadratic equation involving soil‐water and buffer pH's; in the other, CEC was estimated as the summation of extractable cations and exchangeable acidity. The two estimated CEC's agreed well with each other and also had the same magnitude as CEC determined by the normal NaOAc, pH 8.2 method. By averaging the two calculated values, an even closer estimation of the measured CEC was found. These calculations and comparisons can be accomplished quickly and efficiently by a minicomputer via a simple FORTRAN program.
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