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<br />(c:> <br />~'-! <br /> <br />L') Change in production outputs due to treatment include produet mix, quantity <br />..-j <br /> <br />c.:' <br /> <br />produced, and quality of product. <br /> <br />Product mix may be affected by change in land <br /> <br />use, more intensive land use, or change in cropping pattern. Change in yield <br /> <br />and grade of product also affects economic return. <br /> <br />Change in net farm income due to treatment is dependent on soil type, farm size, <br /> <br />and type of irrigation system. Therefore, estimates would be made for all <br /> <br />possible combinations of the three variables. Definition 01' the variables is <br /> <br />necessary to distinguish characteristics and reduce the number of possibilities. <br /> <br />Soil types would be grouped by production potential. Farm size could include: <br /> <br />full time commercial farms; part time commercial farms; and" part time hobby <br /> <br />farms. Methods of irrigation could be divided between sprinkler and surface and <br /> <br />may be further subdivided, i.e., sprinkler-side roll, center pivot and hand <br /> <br />line, surface-furrow, graded borders, and contour ditch. <br /> <br />Sampling Levels <br /> <br />Study intensity includes consideration of the number of estimates to be made <br /> <br />(aggregation of variables), the reliability of estimates, and time required to <br /> <br />develop a predetermined level of reliability for a given number of variables. <br /> <br />At all sampling levels, the number of estimates made and reliability of <br /> <br />individual estimates will increase with repeated annual observations. <br /> <br />Select Data Sources <br /> <br />In the spring, all disciplines involved wIll meet to select operators from whom <br /> <br />data will be collected. Monitoring of economic impacts will be correlated with <br /> <br />monitoring irrigation and wIldlife effects. <br /> <br />43 <br />