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h"ta�on... � �[td-Hldw N�uch? <br /> RoWft gepth - <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 cro <br /> soil, or degrading water quality It involves applying water in g p growth. Rooting depth may be restricted to a <br /> .. depth considerably less than the normal root depth-by soil <br /> accordance with specific crop needs in alriounts that can be <br /> retained in the sail for crop use and at rates and times that.are Irrilimitations (i.e., hardpan, high water table, and so forth}. <br /> consistent with soil intake characteristics and erosion hazard. crops, design rooting depths for several mature irrigated <br /> stlan, grown on deep, permeable well-drained soil, are given <br /> below. <br /> SON <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 influen6a•] factors in determining <br /> the Available Waterholding Capacity (AWC)of a soil. Many <br /> soils have varying textures at different depths_ Table I gives citep Feet <br /> the general range of AWC per foot of depth for several soil Alfalfa 3.0-6.0 <br /> 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 /> TABLE 1 Available Waterholding Capacity for Citrus 3.0-5.0 <br /> Various Sod TexturesCorn 2.0-4.0Cotton 4.0-5.0 <br /> Grape 3.0-4.0 <br /> Ladino Clover 2.0-3.0 <br /> AV�18d18 moisture Ladino <br /> 1.0-2.0 <br /> Range Average Melons 3.0-4.0 <br /> Safi Texture oats 2.0-3.0 <br /> Olives 4.0-5.0 <br /> Very coarse to coarse textured sand 0.5-1.25 0.90 Onions 1.0-3.0 <br /> Pasture(perennial) 2,0-4.0 <br /> Moderately coarse textured sandy.loams 1.25-1.75 1.50 Peach, pear,plum 4.0-5.0 <br /> and fine sandy loamsSafflower <br /> 3.0-5.0 <br /> Sorghum 3.0-4.0 <br /> Medium texture-very fine sandy foams 1.50-2.30 1.90 Squash 3.0 4 0 <br /> to silty clay foams Sugar beets 4.0-6.0 <br /> Fine and very fine texture-silty clay to clay 1.60-2.54 2.10 Tomato 3.0 4.0 <br /> Walnut 5.0-7.0 <br /> Wheat 2.0-3.0 <br /> Peals and mucks 2.00-3A0 2.50 <br /> I <br />