Lime requirement determination of tropical peat soil using buffer‐pH methods
作者:
M. H. A. Husni,
Shanthi Devi,
M. Peli,
A. R. Anuar,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1994)
卷期:
Volume 25,
issue 13-14
页码: 2467-2480
ISSN:0010-3624
年代: 1994
DOI:10.1080/00103629409369200
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A study was conducted to calibrate and evaluate five buffers for the lime requirement (LR) determination of tropical peat soil. The buffers tested were the Shoemaker‐McLean‐Pratt (SMP); Mehlich; 0.1M ammonium acetate (NH4OAc); 0.1M barium acetate [(Ba(OAc)2]; and 0.1M calcium acetate [Ca(OAc)2]. Calibration was done by comparing the precision of linear regression equations adjusted to the relationships between the LR rates required to achieve pH 5.0 measured in a 1: 4 (soiltwater) ratio as determined by incubation and soil‐buffer pH values. Incubation LR using calcium carbonate (CaCO3) to achieve pH 5.0 by peat soil was utilized to calibrate each buffer. Evaluation was carried out by assessing the LR from the calibrated buffers which estimate the LR nearest to the target pH of 5.0. The calibration study showed that the SMP and Mehlich buffers were less precise than the Ba(OAc)2, NH4OAc, and Ca(OAc)2buffers. The evaluation study indicated that the Ba(OAc)2buffer is the most accurate, followed by NH4OAc and Ca(OAc)2buffers. The Ba(OAc)2buffer method is recommended for LR determination of tropical peat soil and NEUOAc or Ca(OAc)2as an alternative method.
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