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Connect an air inlet with 1- by 12-in. cylinder of Drierite, 1- by 12-in. cylinder of Ascarite, and 1- by 12-in. cylinder of Drierite in series to protect against contamination with carbon dioxide (CO2) and water vapor. Although less tedious procedures may be used for preparing small quantities of the buffer solution, the above procedure has been found to be most satisfactory for preparing bulk quantities of the buffer solution. 25 cm3 air-dried <10-mesh-sieved (2-mm) soil into a 50-mL cup in a tray designed for a mechanical shaker.
1978), originally suggested by Yuan (1974), has been developed to alleviate some of the shortcomings of the original method (McLean, 1978). The SMP method is described by van Lierop (1990), Eckert (1988; 1991), Eckert and Sims (1995), Anonymous (1994c), and Watson and Brown (1998). 01 pH unit. 9 tons/acre (1120 to 2016 kg/ha) for mineral soils limed to near neutral pH. 5 ton/acre (1120 kg/ha) for soils of high lime requirement. 8 g calcium chloride dihydrate (CaCl2·2H2O). Add approximately 9 L water.
Soil Storage The effects of long-term storage on the pH of a soil are not known, although Bates (1993) found that one laboratory reported that there was a decline in pH after just 1 month of storage. J. Soil Buffer pH (Lime Requirement) 1. Introduction Exchangeable acidity, a measure of the H ions on the soil colloids, can be measured by interacting a soil sample with a specially prepared buffer solution. Although exchangeable acidity can be determined accurately by titration (Yuan, 1959), the buffer method is quickly and easily performed in the laboratory, making it well suited for routine use in soil testing laboratories (McLean, 1978).