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MEMORANDUM <br />December 13, 2013 <br />Issues with Selecting an Appropriate Crop Growth Stage Coefficient for the SCS Mod. Blaney <br />Page 9 of 34 <br /> <br />Figure 4 - kc vs. month <br /> <br /> <br />Crop Elevation <br />(m) (ft) JAN FEB <br />Lawn Grass 263 864 0.348 0.528 <br />KY Bluegrass 1,350 4,428 <br /> <br /> Table 7 - kc values for lawns <br /> <br />Sugar Beets. The crop growth stage coefficients in <br />data sets provided in ARS 1275. Data from ARS 1275 were reported <br /> <br /> <br />Location <br />Huntley <br />Scottsbluff <br />Redfield <br />Logan <br /> Table 8 – Locations of <br /> <br />The data from ARS 1275 suggest that there is <br />shown in Chart 3 and suggests that the <br />appears that the SCS TR-21 curve <br />August, then approached a value near the average of Huntley, MT and <br />0.978, Chart 4). <br /> <br />0 <br />0.2 <br />0.4 <br />0.6 <br />0.8 <br />1 <br />1.2 <br />0 2 <br />Issues with Selecting an Appropriate Crop Growth Stage Coefficient for the SCS Mod. Blaney-Criddle Eqn. <br /> for lawn & Kentucky Bluegrass <br />Month <br />FEB MAR APR MAY JUN JUL AUG SEP OCT <br />0.528 0.743 0.864 1.023 0.989 0.922 0.885 0.800 0.800 <br /> 0.97 1.00 1.10 1.06 0.98 0.97 0.89 <br />The crop growth stage coefficients in SCS TR-21 for sugar beets were <br />Data from ARS 1275 were reported from the following locations: <br /> Elevation <br /> State Crop (m) (ft) <br />MT sugar beets 921 3,022 <br />Scottsbluff NE sugar beets 1,186 3,891 <br />SD sugar beets 398 1,305 <br />UT sugar beets 1,382 4,534 <br />Locations of sugar beet data from ARS 1275 <br />uggest that there is a correlation (R2 = 0.764) to the SCS TR <br />that the SCS TR-21 coefficients were developed from ARS 1275 data <br />21 curve may follow the average of the four data sets from <br />approached a value near the average of Huntley, MT and Logan, UT in October (R <br />4 6 8 10 12 <br />SCS TR-21 Pasture Grass <br />ADJ. Pochop, to Pasadena, CA Elevation <br />"lawn grass" in Pasadena, CA <br />Criddle Eqn. <br /> <br />OCT NOV DEC <br />0.800 0.54 0.35 <br />0.89 <br />for sugar beets were compared to four <br />from the following locations: <br />SCS TR-21 coefficients as <br />from ARS 1275 data. It <br />from May through <br />Logan, UT in October (R2 = <br />14