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i. f. <br />Subpart A - General <br />C0683.2 (b) (5) <br />(4) One modification requires <br />that are directly related to the me; <br />the consecutive short periods which <br />season. The other requires the use <br />the influence of crop growth stages <br />Therefore: <br />using climatic coefficients <br />an air temperature for each of <br />constitute the growing <br />of coefficients which reflect <br />on consumptive use rates. <br />k = Qt) (kc) <br />Where <br />k = climatic coefficient related to mean air temperature, <br />kt = 0.0173t - 0.314 <br />kc = coefficient reflecting the growth stage of the crop. <br />(5) The procedure for determining irrigation water <br />requirements by this method is outlined in "Irrigation Water <br />Requirements, SCS Technical Release No. 21, revised 1970". <br />Another important reference is "Crop Water Requirements" FAO <br />Irrigation and Drainage Paper 24 revised 1977. <br /> <br />(CO210-V1-COIG, December 1988) <br />C0683-3