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Published in Soil Sci Soc Am J 42:311-316 (1978)
© 1978 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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An Improved SMP Soil Lime Requirement Method Incorporating Double-Buffer and Quick-Test Features1

E. O. McLean, D. J. Eckert, G. Y. Reddy and J. F. Trierweiler2

ABSTRACT

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.

NOTES

1 Approved for publication as Journal Article no. 61–77 of the Ohio Agric. Res. and Develop. Center, Wooster, OH 44691.

2 Professor, Graduate Associate, former Graduate Associate, and Associate Professor, respectively. The Ohio State Univ. and the OARDC.

Received for publication May 9, 1977. Accepted for publication October 14, 1977.






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