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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 12 of 34 <br /> <br />Figure 8 – Crop curves for Corn <br /> <br />Alfalfa. Woodward indicated that the curve for alfalfa is used for alfalfa <br />alfalfa-grass and clover data in ARS 1275 w <br />coefficients in TR-21 for alfalfa were compared to <br />were reported from the following locations: <br /> <br /> <br />Location <br />Mesa <br />Davis <br />Los Angeles <br />Stockton <br />Salinas <br />Sacramento <br />Mandan <br />Scottsbluff <br />Redfield <br />Logan <br />St. George <br />Caldwell <br />Caldwell <br />Prosser <br /> Table 11 – <br /> <br />The data from ARS 1275 show a strong relationship <br />suggests that it is probable that the TR <br />average elevation 1,520 feet above sea level <br />0 <br />0.2 <br />0.4 <br />0.6 <br />0.8 <br />1 <br />1.2 <br />1.4 <br />0 10 20 <br />Cr <br />o <br />p <br /> <br />G <br />r <br />o <br />w <br />t <br />h <br /> <br />S <br />t <br />a <br />g <br />e <br /> <br />C <br />o <br />e <br />f <br />f <br />i <br />c <br />i <br />e <br />n <br />t <br />, <br /> <br />k <br />c <br />Issues with Selecting an Appropriate Crop Growth Stage Coefficient for the SCS Mod. Blaney-Criddle Eqn. <br />orn (grain) <br />Woodward indicated that the curve for alfalfa is used for alfalfa-grass or legume <br />grass and clover data in ARS 1275 were included in our analysis of alfalfa. The crop growth stage <br />re compared to 14 data sets from ARS 1275. Data from ARS 1275 <br />were reported from the following locations: <br /> Elevation <br />Location State Crop (m) (ft) <br />AZ Alfalfa 378 1,243 <br />CA Alfalfa 16 52 <br />Los Angeles CA Alfalfa 71 233 <br />Stockton CA Alfalfa 4 13 <br /> CA Alfalfa 16 52 <br />Sacramento CA Alfalfa 9 30 <br />Mandan ND Alfalfa 502 1,647 <br />Scottsbluff NE Alfalfa 1,186 3,891 <br />Redfield SD Alfalfa 398 1,305 <br />UT Alfalfa 1,382 4,534 <br />St. George UT Alfalfa 872 2,860 <br />Caldwell ID Alfalfa-Grass 724 2,375 <br />Caldwell ID Red Clover 724 2,375 <br /> WA Clover 203 666 <br />– Locations of alfalfa data from ARS 1275 <br />show a strong relationship (R2 = 0.946) to TR-21, as shown in <br />the TR-21 coefficients reflect alfalfa (and grass, or <br />above sea level. <br />30 40 50 60 70 80 90 <br />Percent of Growing Season <br />SCS TR-21, Corn (grain) <br />Task Memo 59.1 <br />ADJ. Davis, CA <br />Criddle Eqn. <br /> <br />grass or legume-grass. The <br />The crop growth stage <br />Data from ARS 1275 <br />21, as shown in Chart 7, and <br />(and grass, or legumes) at an <br />90 100