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

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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 - PowerPoint PPT Presentation

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  • 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

    prepared for SERA-6 conferenceJune 4-5, 2007F.J. SikoraUniversity of KentuckySoil pH and buffer pH methodology:water and SMP/Sikora buffer reaction timewith soil and a laboratory survey

  • Variations in methods for determining 1:1 soil:water pH

    Reference pub

    Quantity of soilStirring (or mixing) time after adding waterStanding time before determining pH

    Stirring during/before pH measurementSPAC, Inc.4.25 cm3, 5 g, or 10 cm3Stir for 5 sec10 minstir during pH measurementSouthern10 cm3Mix for 5 sec30 minstir soil suspension by swirling the cup slightly just prior to reading pHNortheasternScoop 5 cm3 or weigh 5 gStir vigorously for 15 sec30 minplace electrodes in the slurry, swirl carefully and read pH immediatelyNorth Central4.25 cm3(5 g scoop)Stir vigorously for 5 sec10 minplace electrodes in the slurry, swirl carefully and read pH immediatelyWestern5 0.1 gStir thoroughly for 5 sec15 minplace electrodes in the slurry, swirl carefully and read pH immediately

  • Variations in SMP methods for determining buffer pH

    Reference pub

    Quantity of soilVolume of buffer added to soil pH slurry and shaking time

    Oscillations/minStanding time before determining pHSPAC, Inc.4.25 cm3 or 5 g10 mL buffer, shake for 10 min (or 15 min)>18030 min (or 15 min)SouthernNortheasternScoop 5 cm3 or weigh 5 g10 mL buffer, shake for 10 min (or 15 min)25030 min (or 15 min)North Central4.25 cm3(5 g scoop)10 mL buffer, shake for 10 min (or 15 min)25030 min (or 15 min)Western5 0.1 g10 mL buffer, stir every 5 minutes for 20 min20 min

  • Mclean, Eckert, Reddy, and Trierweiler. 1978. An improved SMP soil lime requirement method incorporating double-buffer and quick-test features. SSSAJ 42:311-316. excerpt from1975 North Central publicationon soil test methods.

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

  • Chart1

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