Agricultural gypsum for alkali land reclamation
AuthorHarris, Charles M.
Mining and Metallurgical Engineering
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It has been established that a considerable amount of the saline soils mentioned above are, in fact, saline-alkali lands having exchangeable sodium percentages appreciably greater than 15 and having conductivities of the saturation extract greater than 4 millimhos per contimetor. Most soils in the western part of the United States contain some adsorbed sodium in the exchange-complex of the clay colloids. When this this exchangeable - sodium percentage exceeds 15, then the soil is classified as alkali. When it appreciably exceeds this value, the soil is in need of chemical amendment in addition to leaching to bring about reclamation. If adequate quantities of some corrective mineral such as gypsum are not present in the surface soil, thon it must be added. Otherwise, leaching may remove the soluble salts, cause an increase in pH value and produce soil exchanges which would reduce infiltration rates, a circumstance' which would defeat efforts towards reclamation. Investigations so far conducted have indicated that soils around Logarou Lagoon in the Arta plain (Pachykalamos area) and those on the lower Acheloos River delta (Neochori aroa) are of this typo. Thyy also indicate that considerable applications of gypsum will be required and that this might easily be a controlling factor in economic feasibility of reclamation. Until this year the cost of agricultural gypsum delivered to the two sites of use mentioned above has been approximately $9,00 - 10,00/M.T» The writer considered this quite expansive and investigations were started to determine what actual delivered costs should be under a well - planned mining, processing and distribution arrangement. This report analyzes costs of production and distribution under two different sets of conditions.
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