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'-",. 26 The following is a list of the soil series mapped in the area with the approximate percentages of each: ;'1 Weld Terry Gi Icrest Nunn Cass Lari mer 56 20 9 9 5 I So; Is of the Weld Group: The Weld group consists of upland soils occupy- ing nearly level or gently roll ing ~reas in which the soil has weathered into three well-defined layers and in which the deep subsoil consists of friable fine sandy loam to a depth of 5 feet or more. In some places, soft sandstone under- lies it at a depth of nearly 5 feet, and throughout the area sandstone or shale underl ies it at a greater depth. The Weld soils in the Greeley area correspond closely to the Weld soi Is of the Fort Collins area. Weld find sandy loam is the predominant upland soil north of Cache la Poudre Valley. This soil is found west of Greeley and extend- ing as far north as State Highway No. 14 and westward from Ault. It is typically developed around Lucerne and Eaton and westward to Severance. All the land is under irrigation and is intensively farmed. Many growers consider this area to be the best late potato land of Greeley area, but it is also used for a wide diversity of crops. Weld fine sandy loam, valley phase--Stretching across the body of Weld fine sandy loam are numerous long narrow strips or belts of soils, occurring along small drainage ways, and small shallow circular and ell iptical depressions. Much of the so; I of this phase has become seepy through the accumulation of water from irrigation and the rise of water table. Wherever it is seepy, it contains alkali in different amounts. Much of the valley phase of Weld fine sandy loam has been drained, and much more drainage is needed. Where well drained, the land is productive and is used for the production of alfalfa, sugar beets, corn, and other crops. Soils of the Terry Group: These soils, where deeply weathered or where covered to a great depth by wind-blown material, are highly productive, differ- ing but little in crop value from the Weld soils. As a whole, they are more uneven and more difficult to irrigate. There are numerous shallow areas, where sandstone or shale comes near, or I ies at the surface and where the land is irrigated, seepy and alkal i spots develop. So; Is of the Gi lcrest Group: Gi lcrest gravelly' ~andy loam has a brown gravelly sandy loam surface soi I containing Some coarse sharp sand. This soil is used in the production of sugar beets, early potatoes, small grains, beans, and a number of other crops. Its water requirements are high, and as a whole the soil is less productive than soils with heavier subsoils. ,', Nunn clay loam differs from Gi lcrest gravelly sandy loam in being darker brown in color, heavier in texture, deeper to the gravel subsoil, and as a whole, more productive. This soil is also: more difficult to cultivate. It is located in long narrow belts from northwest to southwest and occupies