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TABLE 2 <br /> Parameter, Procedure, and Reference List <br /> for Soil Analyses <br /> 1990 Field Season <br /> Parameter-Units Procedures-Reference <br /> Sample preparation Samples were dried at less than 35°C <br /> and crushed to pass a 10 mesh sieve. <br /> Excessive grinding of spoil was avoided. <br /> Rock fragments in soil samples were <br /> removed. <br /> pH (determination using saturated paste) U.S. Salinity Lab (1969), Method 21a, <br /> p. 102. <br /> Conductivity of saturation extract in Rhoades (1982), Method 10-3.3. <br /> mmhos/cm at 25°C <br /> Organic Carbon in percent Nelson and Sommers (1982), Section <br /> 29-3.5.3 <br /> Particle size analysis in % sand, Gee and Bauder (1986), Method 15-5. <br /> silt, and clay <br /> Textural classification USDA (1951), P. 209. <br /> Nitrate Nitrogen in ppm Keeney and Nelson (1982), Methods <br /> 33-3.2, 33-8.2, and 33-8.3. <br /> Ammonium Nitrogen in ppm Keeney and Nelson (1982), Methods <br /> 33-3.2, 33-7.2, and 33-7.3. <br /> Phosphorus in ppm Olsen and Sommers (1982), Method <br /> 24-5.4. <br /> 9 <br />