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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />t\~4g'J!' <br />v :,) _:..,~ iiJ~} <br /> <br />G. LAND USE AND REGIONAL SHARES OF PRODUCTION <br /> <br />To determine the location of the production of agricultural cOlllDod- <br />ities in the U.S., this NIRAP Model component relies upon four model sub- <br />components. The regional shares subcomponent determines the percentage of <br />national production within each of the states. The crop yield subcomponent <br />determines the yield per acre of the 23 agricultural crops commodities by <br />four different cropping practices--irrigated production, dryl and <br />producti on, conti nuous croppi ng, and summer fall ow cropping. The cropl and <br />avail abil ity subcomponent determines the total irrigated and non- irrigated <br />cropland available within each state. The land use subcomponent determines <br />the acreage pl anted to each cropping practice by commodity within each <br />state. The procedure for producing internally consistent projections is an <br />iterative technique in which each subcomponent is computed first independ- <br />ently to correct for inconsistencies within each respective subcomponent, <br />and then all four subcomponents are computed together and intra-component <br />inconsistencies are corrected. <br /> <br />II -48 <br />