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orado State University Master Gardener •- Soil Water Holding Capacity and Irrigation Management Page 4 t <br />Some plants, like Kentucky bluegrass, can go dormant under wafter stress. Tall fescue is an example of plants that <br />survive short-term dry soil conditions by rooting deeper (if soil conditions allow) reaching a larger water supply. <br />But tali fescue can't go dormant. <br />' Irri aggjn: How Much? How Often? <br />i <br />1 Table 2 illustrates the relationship of the soil water holding capacity, ET, and rooting depth. <br />i <br />Table 2. Irrigation summary of a textbook soil <br />Soil Type <br /> sandy Sandy Laarn Loamy & Clayey <br />Available water per foot of soil 0.5" 0.75" 1" <br />6 inch rootna deb <br />Inches of available water, and inches of <br />water to apply per irrigation (Additional <br />amounts would leach below the rooting 0.25" 0.38" 0.5" <br />zone.) <br />Typical days between lawn irrigation- m <br /> <br />April (at 0.33„per day average) 2 days 3 days 4 days <br /> <br />June (at 0.20" per day aaverage) <br />1. day <br />2 day - - ---------- <br />2Vh days <br /> <br />Inches of available water, and Inches of <br />water to apply per irrigation (Additional <br />amounts would leach below the rooting 0.75" 1." <br />zone.) <br />Typical days between <br />lawn irrigation* April (at 4 days 6 pays 8 days <br />0.13"per day average) <br />June (at 0.20" per day <br /> <br />average) 21#12. days 4 days 5 days <br />?_`!; MCh rgo-ti?9 deg?h <br />Inches available water <br />and Inches of water to <br />apply per irrigation* <br />(Additional amounts 2" <br />would leach below the <br />rooting zone.) <br />i Typical days between <br />lawn irrigation April (at 8 days 11 V2 days 1S days <br />V.13- per day average) <br />June (at 0.20" per day <br />average) <br />S Days <br />7'/2 days <br />10 days <br />i *Sased on Historical ET for a coal season lawn <br />I Related links I Answerl-ink 1 Horticulture Web Search I Benefits of Gardening I CMG Outreach I CMG Training <br />htty lhvww. ext. colostate, edu/m e/files/g ardennotes/26 2 -Soil Water.html <br />if 7 <br />11312008 <br />67