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1. Soil pH and SMP Buffer pH methodologies Time for SMP buffer to set in soil-water slurry

Soil pH and buffer pH methodology: water and SMP/Sikora buffer reaction time with soil and a laboratory survey. 1. Soil pH and SMP Buffer pH methodologies Time for SMP buffer to set in soil-water slurry b. Conditions on LabFit for soil pH and Sikora buffer pH

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1. Soil pH and SMP Buffer pH methodologies Time for SMP buffer to set in soil-water slurry

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  1. Soil pH and buffer pH methodology: water and SMP/Sikora buffer reaction time with soil and a laboratory survey • 1. Soil pH and SMP Buffer pH methodologies • Time for SMP buffer to set in soil-water slurry • b. Conditions on LabFit for soil pH and Sikora buffer pH • 2. Laboratory survey on pH and lime recommendations F.J. Sikora University of Kentucky prepared for SERA-6 conference June 4-5, 2007

  2. Variations in methods for determining 1:1 soil:water pH

  3. Variations in SMP methods for determining buffer pH

  4. excerpt from Mclean, Eckert, Reddy, and Trierweiler. 1978. An improved SMP soil lime requirement method incorporating double-buffer and quick-test features. SSSAJ 42:311-316. 1975 North Central publication on soil test methods.

  5. Table in the current North Central region publication on soil test methods. SMP Buffer pH

  6. LEXINGTON LAB

  7. PRINCETON LAB

  8. buf buf

  9. LabFit method with Sikora buffer Method for adding water to soil Each sample stirred with stir rod and let set for 30 min. 0.33 min. stirring time for buffer in soil ±0.11 37 min. time buffer set in soil prior to measurement ±4 1.5 hrs for 3 trays (n=120)

  10. Soil pH Buffer pH Sikora Buffer pH, LabFit instrument Soil pH, LabFit instrument Soil pH, NAPT median SMP Buffer pH, NAPT median 1:1 line regression line

  11. Soil pH Each sample stirred with stir rod for 5 sec and let set for 30 min. Tray swirled for 5 sec. and let set for 30 min. Soil pH, LabFit instrument Soil pH, LabFit instrument Soil pH, NAPT median Soil pH, NAPT median 1:1 line regression line

  12. & SERA6 A Mid-Atlantic Soil Testing and Plant Analysis Work Group survey on methods for soil pH, buffer pH and lime recommendations Objectives are to assess: 1. variation in lab methods being used. 2. effect of method variation on intra- and interlaboratory error. 3. variation in how lime recommendations are made.

  13. Soil pH MAD values in the NAPT program

  14. SMP Buffer pH MAD values in the NAPT program

  15. extra slides

  16. Variations in methods for Mehlich III extractable nutrients

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