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• <br />Parameter, Procedure, and Reference List <br />In[er-MOUn[ain Laboratory <br />Farmington, New Mexico <br />Table 91.1 Cont. <br /> <br /> <br />_Parameter-Units ___________ Proc edure_R of erence _____________________ <br />Sodium Adsorption Ratio U.S. Salinity Lab (19697, p. 26. <br />Organic Matter in percent <br />Particle size analysis in Y. sand, <br />silt, and clay. <br />Nelson B Sommers (1982), Section 24-3.5.3. <br />Gee 8 Bauder (1986), Method 15-5. <br />Textural classification <br />Ammonium 8 Nitrate Nitrogen <br />in ppm <br />USDA (1951), p. 209. <br />Keeney 8 Nelson (1982), Methods <br />33-6.2 8 33-6.3 or 33-7 8 33-8. <br />• <br />Phosphorus in ppm <br />Olsen 8 Sommers (1982), Method <br />24 -5.4 ar 24-5.5. <br />20 <br />