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(42.8%) and redtop (24.0%) is the major portion of moderately sensitive <br />forage. <br />The Trout Creek alluvial valley floor region was evaluated with the assessment <br />of irrigated pastures 7, 8N, 8S, 10, 11, 12E, 14, 15N, and 15S which are <br />denoted on Map 36, Salt Loading Study. Pasture 12W was also sampled; this <br />pasture has been irrigated but has not been improved for either hay or pasture <br />production. The area is more typical of a sagebrush/meadow type community. <br />Data from a total of 47 cover transects were collected in this area. Table 2, <br />Trout Creek Alluvial Valley Floor Vegetative Cover of Irrigation Pastures, <br />denotes the species cover and composition as calculated on a weighted average <br />basis for the 9 pastures which were studied. In this region, total vegetative <br />cover is 83.5%. The grasses cover 53.3%, grasslike plants cover 9.2%, fortis <br />comprise 19.0%, and shrubs cover 2.0% of the area. <br />Smooth brome and reed canarygrass are both considered moderately tolerant. <br />Similar moderately tolerant species include tall fescue, foxtail barley, <br />intermediate wheatgrass, western wheatgrass, and wheatgrass. A total of <br />17.0% of the area is composed of moderately tolerant grasses, as calculated on <br />a weighted average. Another 8.9% of the area is covered by moderately <br />tolerant grasslike species. The total coverage of moderately tolerant <br />species is 25.8% of 30.9% of the relative composition. Orcfiard grass and <br />timothy, both moderately sensitive species, are found in the area. Various <br />species of clover are also found. Moderately sensitive species comprise 15.3% <br />of the Trout Creek Area cover on a weighted average basis, which represents <br />18.4% of the relative cover. Species production data was obtained for <br />Pasture 11 which is irrigated with water diverted from Trout Creek above the <br />confluence of Middle Creek. Table 2, Pasture Eleven Vegetative Cover and <br />Production, indicates a total of 127.5 grams per quarter meter square plot and <br />were obtained from the pasture. This corresponds roughly to 4550 pounds of <br />oven dried forage per acre. Of this amount, 27.9% of the relative production <br />is composed of moderately tolerant species and 34.6% is of moderately <br />sensitive species. Smooth brome was the ma.lor component, 10,0%, of the <br />moderately tolerant grasses while Carex, a moderately tolerant grasslike <br />plant, contributed 13.6%. Redtop supplied 23.2% of the moderately sensitive <br />total production and timothy supplied 9.3%. In Pasture 11, the vegetative • <br />6 Revised 10/1/86 <br />