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<br />feas1ble. <br /> <br />F1ve different crops were considered 1n conjunct1on .1tl'l ten <br /> <br />0, <br />c;> d1fferent combinations of 1rrigation technolo~ies and manag~ent techniques. <br />. <br />~, <br />c.~ The model maximizes annual net returns to the fbed resources. lane: aM <br /> <br />water. <br /> <br />This measure 15 an appropriate social welfare indicator for the <br /> <br />prOducer case wl'lere supply impacts are not large enough to materially affect <br /> <br />commodity prices CMarglfn. Pl'. 40-42). Returns are measured on a pre-tax bas1s <br /> <br />with no considerat1on of federal C0tm10dity programs. The model represents a <br />lons-run plannfng horizon. because annualfzed irrigation improvement costs are <br /> <br />included as an important pol fey varhble. <br /> <br />The private costs 1mposed by an <br /> <br />abatement program are defined as reduct10ns in annual net incomes (prcducE:lr <br /> <br />rents) as compared with the baseline (no-program) case. <br /> <br />~ode 1 C ropo inQ .ASSLJ!rot 10n<. <br /> <br />On 1 y tl'le h 1storicall y observed i rr1gated <br /> <br />f181 c: crops are incorporated into the model: <br /> <br />alfalfa hay. pasture, corn. <br /> <br />edible dry beans and barley. Perenn1al fruit crops. accounting for slightly <br /> <br />over 10~ of the irrigated acreage. are not s1mulated. Thus, about 50.000 of <br /> <br />the valley's est1mated 56,000 1rrigated acres are represented. <br /> <br />The average <br /> <br />1977-81 crop mix on the 27,000 acres of hnds served by tl'le U.S. Bureau of <br /> <br />Reclamation irrigation project was assumed to be representative for the entire <br /> <br />valley. One standard deviat1cn was adaee and subtracted from these averages to <br /> <br />provide upper and lower acreage limits for the model solutions (Miller). <br /> <br />The machinery complements and input use rates are acapted from crop <br /> <br />budgets developed by Leatl'lers anc Young and from Extension Ser....ice reports. <br /> <br />Crop prices were based on real five-year average prices received anc. siml1ar <br /> <br />to input prices, ware expressed in 1982 dollars. The crop bUdgets represent <br /> <br />costs for the average she el50 acres) of a full-time hrm unit in tl'1e Grana <br /> <br />Valley (U.S. Soil Conservaticn Service). Crop production is a secondary source <br /> <br />6 <br />