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<br />I <br /> <br />2472 <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />COLORADO UTE - AGRICULTURAL ENGINEERING STUDY <br /> <br />CROP COEFFICIENTS <br />TABLE A-l.2 <br /> <br /> Daily Hean ET Crop Coefficients (Kc)' fOT normal lrrlc~tlon ~nd <br /> precipitation conditions. Cor: use with alhlIa reference ET for <br /> crops grown tn an a,yid region with a temperate intermountain <br /> cl1lDate. Coefficients wer~ ex~erl=entally determined from weigh- <br /> ing lys!meter ET data, Khlb.rly. Idah.o, 1965-L918. r(om Wright (1981). <br />.. .. .. .. .. '" .. .. .. .. .. .. ....... ..""...."'.... ........... <br /> HeaD ET c.rop c.oeHic:ient!l. K,. <br /> Time from planting co effective cover (I) <br />C'Cop 10 20 30 '0 50 60 70 80 90 100 <br />Barley 0.30 0.30 0.32 0.40 Q. &5 0.85 0.95 0,99 1.00 l.00 <br />Peas 0,30 0.30 0,30 0.36 0.4J 0.51 0.58 0.73 0.85 0.93 <br />Sugar Beet.s 0,30 0.30 Q.30 0.30 0.30 0.32 0.40 0.60 0.80 l.00 <br />POt.3toes 0.30 0.30 0.30 0.31 0.44 0.57 0.69 0.77 0.82 0.85 <br />Corn 0.30 0.30 0.30 Q.30 0.32 0."'2 0.55 0.70 0.85 0.95 <br />neans 0.30 0,30 0.30 0.35 0.45 0.55 0.68 0.80 0.90 0.95 <br />Wlnl:c.r Wheal: 0.30 0.30 0.50 0.75 0.90 0.98 1. 00 1. 00 1.00 1.00 <br /> Days aite~ effeCI:Lve covet" <br /> 10 20 30 40 50 60 70 80 90 100 <br />Barley 1,00 l.00 0,90 0.50 0.25 0.15 <br />Peas 0.90 0.65 0,53 0.35 0.20 O. L5 <br />SugaT Beets 1.00 1.00 LOO 0.98 0.94 0,89 0.85 0.80 0.74 0.60 <br />Potatoes 0.85 0,83 0.81 0.79 0,75 0.70 0.65 0.50 0,35 0.25 <br />Field Corn 0.96 0.95 0.94 O.QO 0.85 0.79 0.74 0.35 0.25 <br />Sweel Corn 0.93 0.93 0.90 0.85 0,75 0.58 0.40 0.20 <br />Beans 0.95 0.90 0.67 0.33 O..l5 0.10 <br />"Hnter Wheat l.00 1. 00 1. 00 O.Q5 0.55 0.25 0.15 D.n <br /> Time from new growl:h to harvest. (I) <br /> !D 20 30 '0 50 60 70 80 90 100 <br />Alfalfa (lst) 0.70 0.82 0,91 0.96 l.OD LOO 0.98 0.96.0.95 0.95 <br />(2nd Ii )rd) 0.40 0.50 0.80 Q.96 0,98 LOO LOO 0,98 0.95 0.9S <br />(4th) 0.40 0.44 0.60 0.65 0.55 0.50 0.45 0.35 0.30 0.25 <br />. . .. . .. .. . .. - .. .. . . .. . . .. - .. <br /> <br />1-9 <br />