Liu, M. and Kissel, D.E. and Vendrell, P.F. and Cabrera, M.L. (2004) Soil lime requirement by direct titration with calcium hydroxide. Soil Science Society of America Journal, 68 (4). pp. 1228-1233.
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Abstract
A simple method for titrating acidic soils could be used by soil testing laboratories as an alternative method for routinely determining the lime requirement (LR) of soils. Because soil pH as a function of added base is linear in the pH range of 4.5 to 6.5, it may be possible to determine the slope of this relationship by regression analysis using a minimum number of base additions. The LR could then be determined by calculating the corresponding amount of lime required to reach the target pH using the regression equation. Our objectives were to determine reaction times needed for saturated Ca(OH)2 solution to reach an equilibrium pH with 17 widely different soils (16 Ultisols and 1 Podzol) collected from the Ap horizon of agricultural soils and the A horizon of forested soils in Georgia, USA, and then test a simple titration procedure for its ability to predict the LR, determined first by a full titration curve and then by a standard incubation method. All titrations were performed in a 1:1 soil:water ratio with calcium hydroxide as the base. Using the regression procedure to estimate LR, equilibration times of 30 minutes between base additions gave greater LRs than 15-minute equilibration, but the same as 45-minute equilibration. When all 17 soils were considered, the LR from extrapolation of the linear regression yielded the same, as did the full titration curve. The LR from titration with three base additions and 30-minute equilibration time between additions estimated an average of 80% of the LR determined by the 3-day incubation. The Adams-Evans buffer procedure overestimated and underestimated the LR for soils with relatively low- and high-LRs, respectively. Based on these results, titration appears promising for routine use.
| Item Type: | Article |
|---|---|
| Additional Information: | SNNigam Collection |
| Author Affiliation: | Dep. of Crop and Soil Sciences, 3111 Plant Sciences, Univ. of Georgia, Athens, GA 30602, USA. |
| Subjects: | Soil Science and Microbiology |
| Divisions: | General |
| Depositing User: | Mr Balakrishna Garadasu |
| Date Deposited: | 02 Apr 2013 10:35 |
| Last Modified: | 02 Apr 2013 10:35 |
| Official URL: | http://dx.doi.org/10.2136/sssaj2004.1228 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/10164 |
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