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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 15 of 34 <br /> <br />The ARS 1275 did not show a strong relationship (R <br />suggest that the TR-21 coefficients do not reflect the average of the three data sets <br /> <br />Figure 13 - kc vs. month for sorghums <br /> <br />A better correlation (R2 = 0.909) was <br />Garden City, KS. <br /> <br />Figure 14 – Crop curves for dry beans <br />Winter Wheat. The SCS TR-21 coefficients for wheat were compared to <br />Data from ARS 1275 were reported from the following locations: <br /> <br />Location <br />Phoenix <br />Garden City <br />Bushland <br /> Table <br /> <br />0.0 <br />0.2 <br />0.4 <br />0.6 <br />0.8 <br />1.0 <br />1.2 <br />1.4 <br />5 6 <br />0.0 <br />0.2 <br />0.4 <br />0.6 <br />0.8 <br />1.0 <br />1.2 <br />1.4 <br />0 20 <br />Issues with Selecting an Appropriate Crop Growth Stage Coefficient for the SCS Mod. Blaney-Criddle Eqn. <br />ARS 1275 did not show a strong relationship (R2 = 0.851), as shown in Chart 10, <br />do not reflect the average of the three data sets. <br />sorghums <br />was found when the SCS TR-21 curve was compared solely to data from <br />Crop curves for dry beans <br /> <br />21 coefficients for wheat were compared to three data sets from ARS 1275. <br />Data from ARS 1275 were reported from the following locations: <br /> Elevation <br />Location State Crop (m) (ft) <br />Phoenix AZ wheat 340 1,117 <br />Garden City KS wheat 865 2,838 <br />Bushland TX wheat 1,162 3,812 <br />Table 13 – Locations of winter wheat from ARS 1275 <br />7 8 9 10 <br />SCS TR-21, Sorghum <br />Salt River Valley, AZ <br />(Phoenix) <br />40 60 80 <br />SCS TR-21, Sorghum <br />Garden City, KS <br />Criddle Eqn. <br /> to TR-21 and may <br /> <br />as compared solely to data from <br /> <br />data sets from ARS 1275. <br />11 <br />100