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7_71 .. <br /> 1PNgationa..When aed How Mach? Roofing Depth <br /> Conservation irrigation water management means controlling The depth of soil from which a crop can extract water is the <br /> or regulating irrigation water applications in a way that will effective crop rooting depth. This depth will vary with the <br /> satisfy crop,,water requirements without wasting water, eroding stage of crop growth_ Rooting depth may be restricted to a <br /> soil, or degrading water quality. It involves applying water in depth considerably less than the normal root depth by soil <br /> accordance with specific crop needs in amounts that can be limitations(i.e., hardpan,high water table,and so forth). <br /> retained in the soil for crop use and at rates and times that are Irrigation design rooting depths for several mature irrigated <br /> consistent with soil intake characteristics and erosion hazard. crops,grown on deep, permeable well-drained soil, are given <br /> below. <br /> soil <br /> The amount of water a soil can hold, and that is available for <br /> plant use, is determined by the soil's physical properties. Soil TABLE 2 Rooting Depth for irrigation <br /> texture and depth are the most influential factors in determining <br /> the Available Waterholding Capacity (AWC)of a soil_ Many Crop Feet <br /> soils have varying textures at different depths. Table I gives Alfalfa 3.0-6.0 <br /> the general range of AWC per foot of depth for several soil Almond,apple,apricot 4.0-5.0 <br /> textures_ Asparagus 3.0-6.0 <br /> Barley 2.0-3.0 <br /> Beans 2.0-4_0 <br /> Citrus 3.0-5.0 <br /> TABLE i Avagadle Waterhoiding Capacity for Corn 2.0-4.0 <br /> Various Sots Textures Cotton 4.0-5.0 <br /> .Grape 3.0-4.0 <br /> Ladino Clover 2.0-3.0 <br /> Avallr"le Moisture Lettuce 1.0-2.0 <br /> Range Average Melons 3.0-4.0 <br /> 3o[I Texture (;n At) lin Ift-J <br /> Oats 2.0-3.0 <br /> Olives4.0-5.0 <br /> Very coarse to coarse-textured sand 0.5-1.25 0.90 Onions 1.0-3.0 <br /> % Pasture(perennial) 2.04.0 <br /> Moderately coarse-textured sandy loams 1.25-1.75 1.50 Peach,pear, plum 4.0-5.0 <br /> and fine sandy foams Safflower 3.0-5.0 <br /> Sorghum 30-4 0 <br /> Medium texture-very fine sandy loams 1.50-2.30 1.90 Squash 3.0-4.0 <br /> to silty clay loams Sugar beets <br /> Tomato 3.04.0 <br /> Fine and very fine texture-silty clay to clay 1.60-2.50 2.10 Walnut 5.0-7.0 <br /> Wheat 2.0-3.0 <br /> Peats and mucks 2.00-3.00 2.50 <br /> ( 7 <br />