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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 />greater 1 imitati ons fo r crop growth. Subc1 asses are identifi ed by <br />small letters added to the numerals. The letters e, w, s, and c indi- <br />cate erosion, water interference with plant growth, shallow soil, and <br />cold or dry climate growth restrictions, respectively. The most <br />narrow category consists of an Arabic numeral attached to the subclass <br />letter, which identifies soils suited to a particular crop and manage- <br />ment practice. Nearly all soil s in the study area belong to classes <br />III or IV. Major factors influencing this classification include cold <br />climate, short growing season, marginal water available for <br />irrigation, and irrigab1e soils. <br /> <br />2. General Crop Patterns <br /> <br />Crop growth in the service area is limited by such factors as high <br />altitude, high solar radiation, wann days, and cool nights. The pre- <br />dominately deep medium to coarse-textured soils in this climate favor <br />production of small-grain, close growing crops in addition to selected <br />row crops. Most soils contain adequate levels of potash and respond <br />well to additions of nitrate and phosphate fertilizer. <br /> <br />The major crops grown in the area and used for analyses in this <br />study include spring wheat, barley, oats, potatoes, alfalfa, and <br />miscellaneous hay varieties such as wild millet and grain hay. <br />Essentially all crops are irrigated in the service area. <br /> <br />IiI - 3 <br />