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form a representative sample . The samples were air-dried <br /> and subjected to chemical analysis . The Mancos shale <br /> samples were coarsely ground before they were analysed . <br /> Methods : <br /> Salinity Extract - Distilled water was measured <br /> into the samples to the point of saturation to obtain <br /> saturation percentages . After determining the pH of the <br /> pastes , they were subjected to vacuum filtration and the <br /> electrical conductivity of the extracts were determined . <br /> Calcium, magnesium and sodium concentrations were measured <br /> by atomic absorption spectroscopy, and the sodium absorption <br /> ratios were calculated from the ensuing data . <br /> Fertility Components - The samples were extracted <br /> with an ammonium bicarbonate - DTPA solution . Nitrate- <br /> nitrogen and phosphorus were determined colorimetrically and <br /> potassium, iron, manganese, copper and zinc concentrations <br /> were determined by atomic absorption spectroscopy . <br /> Percent Organic Matter - Organic matter content of <br /> the material was determined by digestion with acid and sub- <br /> sequent ferrous sulfate titration . <br /> -22- <br />