An improved SMP soil lime requirement method incorporating double-buffer and quick-test features

McLean, E.O. and Eckert, D.J. and Reddy , G.Y. and Trierweiler, J.F. (1978) An improved SMP soil lime requirement method incorporating double-buffer and quick-test features. Soil Science Society of America Journal, 42 (2). pp. 311-316.

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The double-buffer (DB) feature of the recently-published Yuan method was applied to the Shoemaker-McLean-Pratt (SMP) method at several buffer pH levels, shaking times, and soil/solution ratios. The results, based on regression analysis of buffer-indicated vs. Ca(OH)2-titrated acidities, indicate that the widely used SMP single-buffer (SB) method can be improved considerably by incorporation of DB, quick-test, and mathematical-adjustment features. However, the SMP-SB method is still probably the most satisfactory compromise between simplicity of measurement and reasonable accuracy of results for soils of a wide range in lime requirement (LR). The SMP-DB method with narrow soil/solution ratio and shorter shaking time gave excellent indication of soil LR when adjusted for incomplete reaction with the soil during the shorter “quick-test” reaction time. This adaptation which looks very promising as an improved method (especially for use on soils of low LR where the SMP-SB method is known to lack desired accuracy) is included as a recommended improvement of the SMP-SB method

Item Type: Article
Uncontrolled Keywords: Soil testing, acid soils, exchangeable acidity, liming
Author Affiliation: Professor, Ohio State University
Subjects: Soil Science and Microbiology > Soil Sciences
Divisions: General
Depositing User: Ms K Syamalamba
Date Deposited: 26 Sep 2014 06:28
Last Modified: 26 Sep 2014 06:28
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