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<br />August1997' . <br /> <br />. . COLORADO WATER <br /> <br />15 <br /> <br />Figure 1. Comparison of NO,-N concentrations with depth on clayey and sandy soils which have been fertilized with <br />feedlot manure. The letters "A" and "B" designate that a significant difference was found by t.test at p<O.05. <br /> <br />60 <br /> <br />50 <br /> <br />10 <br /> <br /> <br />........................................_ ...................m............................................ <br /> <br />. <br />Clays <br />. <br />Sands <br /> <br />E40 <br />c... <br />0- <br />~30 <br />cJ:. <br />S120 <br /> <br />o <br /> <br />0.9 <br /> <br />9.24 24-36 <br />Depth (in) <br /> <br />36-49 <br /> <br />Table 1. Quality of water used for irrigation of manured clayey and sandy <br />soils in the South Platte River Basin. <br /> <br /> Sandy Soils Clayey Soils <br /> (primarily (primarily <br /> groundwater) surface water) <br />Electrical Conductivity (dS/m) <br />Average 1270 1440 <br />Minimum 210 380 <br />Maximum 2330 2660 <br />N03.N Concentration (mglL) <br />Average 23.1 6.6 <br />Minimum <0.1 0.7 <br />Maximum 42.7 15.4 <br /> <br />