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• TABLE 2 <br />Parameter, Procedure, and Reference List <br />for Soil Analyses <br />1990 Field Season <br />Parame[e r-Units Procedures-R of erence <br />Sample preparation Samples were dried at less than 35°C <br />and crushed to pass a )0 mesh sieve. <br />Excessive grinding of spoil was avoided. <br />Rock fragments in soil samples were <br />removed. <br />pN (determination using saturated paste) U.S. Salinity Lab (1969), Method 21a, <br />p. 102. <br />• Conductivity of saturation extract in <br />mmhos/tm at 28°C <br />Organic Carbon in percent <br />Particle size analysis in X sand <br />silt, and clay <br />Textural classification <br />Nitrate Nitrogen in ppm <br />Ammonium Nitrogen in ppm <br />• Phosphorus in ppm <br />Rhoades (1982), Method 10-3.3. <br />Nelson and Sommers (7982), Section <br />29-3.5.3 <br />Cee and Bauder (1986), Method )8-5. <br />USDA (195)), P. 209. <br />Keeney and Nelson (1982), Methods <br />33-3.2, 33-8.2, and 33-8.3. <br />Keeney and Nelson (1982), Methods <br />33-3.2, 33-7.2, and 33-7.3. <br />Olsen and Sommers (1982), Method <br />24-5.4. <br />9 <br />