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<br />CAPABILITY CLASSIFICATION <br />Niwot, <br />Capab311ty Unit IVw-1 (Irrigated) <br />This unit consists of deep, somewhat poorly drained soils <br />of ti:a Niwot series, These soils have a surface laver of <br />loam, sandy clay loam, or clay loam that is 10 to 2C' <br />inches deep over gravelly sand, Slopes are 0 to 1 F.ercent. <br />Permeability is moderate, Runoff is slow, and the erosion <br />hazard is slight. Available water capacity is low ar mod- <br />erate, The effective rooting dept: is 60 inches or more. <br />A seasonal high water table is at a depth of ;~ to 1L feet, <br />Included in this unit is Made land that is composed of <br />waste material from sugar factories. dome areas have <br />been seeded to Press and are irrigated. Made land is not <br />suited to dr;.land croppinc and s:;ould remain under a per- <br />manent cover of grass, <br />The soils of this capability unit are suited to very <br />limited cropping. Water-tolerant crops are especially <br />suitable, Eecause t!:e•- are drou~-hty, it is not practical <br />to drain tY.ese soils. ?recuent licht irrigations mini- <br />mize accumulations of salts. Leveling that requires <br />• deep cuts is not suitable because it exposes the under- <br />lyinP, droughty gravelly sand. some smoothing is helo;hl <br />in controlling flow of irrigation water. <br />These soils are best suited to permanent Presses for ha~~ <br />or pasture. Tall wheat€rass, tall fescue, or yellow- <br />blossom sweetclover are suitable for pasture, pastures <br />should be rotated and grazin€ limite~?•so that a minimum <br />of 3 inches of Erouth is left on t;;e soil. ~+.^~en hi Ph <br />water is flowing in stream channels, protection of s';ream- <br />benks is necessary to e:oid erosion. Commercial far+~ilizer <br />improves amount and value o" t':.e :'orage pro~uced. <br />n <br />