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Custom Soil Resource Report <br /> behind as high ground when the ice melted. Eskers range in length from less <br /> than a kilometer to more than 160 kilometers and in height from 3 to 30 meters. <br /> Extrusive rock <br /> Igneous rock derived from deep-seated molten matter(magma) deposited and <br /> cooled on the earth's surface. <br /> Fallow <br /> Cropland left idle in order to restore productivity through accumulation of <br /> moisture. Summer fallow is common in regions of limited rainfall where cereal <br /> grain is grown. The soil is tilled for at least one growing season for weed control <br /> and decomposition of plant residue. <br /> Fan remnant <br /> A general term for landforms that are the remaining parts of older fan <br /> landforms, such as alluvial fans, that have been either dissected or partially <br /> buried. <br /> Fertility, soil <br /> The quality that enables a soil to provide plant nutrients, in adequate amounts <br /> and in proper balance, for the growth of specified plants when light, moisture, <br /> temperature, tilth, and other growth factors are favorable. <br /> Fibric soil material (peat) <br /> The least decomposed of all organic soil material. Peat contains a large amount <br /> of well preserved fiber that is readily identifiable according to botanical origin. <br /> Peat has the lowest bulk density and the highest water content at saturation of <br /> all organic soil material. <br /> Field moisture capacity <br /> The moisture content of a soil, expressed as a percentage of the ovendry <br /> weight, after the gravitational, or free, water has drained away; the field <br /> moisture content 2 or 3 days after a soaking rain; also called normal field <br /> capacity, normal moisture capacity, or capillary capacity. <br /> Fill slope <br /> A sloping surface consisting of excavated soil material from a road cut. It <br /> commonly is on the downhill side of the road. <br /> Fine textured soil <br /> Sandy clay, silty clay, or clay. <br /> Firebreak <br /> An area cleared of flammable material to stop or help control creeping or <br /> running fires. It also serves as a line from which to work and to facilitate the <br /> movement of firefighters and equipment. Designated roads also serve as <br /> firebreaks. <br /> 44 <br />