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Custom Soil Resource Report <br />the mean annual increment continues to increase until mortality begins to reduce <br />the rate of increase. The point where the stand reaches its maximum annual rate <br />of growth is called the culmination of the mean annual increment. <br />Cutbanks cave <br />The walls of excavations tend to cave in or slough. <br />Decreasers <br />The most heavily grazed climax range plants. Because they are the most <br />palatable, they are the first to be destroyed by overgrazing. <br />Deferred grazing <br />Postponing grazing or resting grazing land for a prescribed period. <br />Delta <br />A body of alluvium having a surface that is fan shaped and nearly flat; deposited <br />at or near the mouth of a river or stream where it enters a body of relatively quiet <br />water, generally a sea or lake. <br />Dense layer <br />A very firm, massive layer that has a bulk density of more than 1.8 grams per cubic <br />centimeter. Such a layer affects the ease of digging and can affect filling and <br />compacting. <br />Depression, closed (map symbol) <br />A shallow, saucer - shaped area that is slightly lower on the landscape than the <br />surrounding area and that does not have a natural outlet for surface drainage. <br />Depth, soil <br />Generally, the thickness of the soil over bedrock. Very deep soils are more than <br />60 inches deep over bedrock; deep soils, 40 to 60 inches; moderately deep, 20 <br />to 40 inches; shallow, 10 to 20 inches; and very shallow, less than 10 inches. <br />Desert pavement <br />A natural, residual concentration or layer of wind - polished, closely packed gravel, <br />boulders, and other rock fragments mantling a desert surface. It forms where wind <br />action and sheetwash have removed all smaller particles or where rock fragments <br />have migrated upward through sediments to the surface. It typically protects the <br />finer grained underlying material from further erosion. <br />Diatomaceous earth <br />A geologic deposit of fine, grayish siliceous material composed chiefly or entirely <br />of the remains of diatoms. <br />Dip slope <br />A slope of the land surface, roughly determined by and approximately conforming <br />to the dip of the underlying bedrock. <br />W <br />