^^erwent /?an^e anJ^on^ent fft^g. Montana Pi.n. ^ 

 explains 80 percent of the vari^nrp i ' ont ana.--? i ant and Utter cove 



area. Organic .atter content n. L...!.!. "^ °' ^^^^^ Plots on this St 



erosion, probably through aggregation of soil 'n. \ i ' resistance to 



percent of the variance^ sl^pe^g^adienl ^^^^Z^^^:^"^--:^^^^ 



The regression equation for this study area is: 



y = 1.563 - 0.629.4 - 1.86.2 _ .6. OF . U.2F^ . ,,,0AF . 0.0U3G 



a coemc^eTlHeie^-na" :n of S^^^Cfig 'T, ' 1h"t^^ ^ ^^^^^ 0.33 



and litter cover and organic mattercontenf"of f ^ function of pla 



figure 7. Correction ffctors ?oJ deviat-o^ of Till V ' 'T""'' °^ '''' ^^own 

 percent are in table 1. deviation of slope gradient from its average of 17 



gradient. The effects of cover a^e sLna^ t^ t, the surface inch of soil; and slope 

 but the effect of slope is greater than ™ fje / °" ""^^s. 



three areas, organic matter content L oos, ?!e? " V ' f^"' P'-^"""^ 

 Sion equation for sheet erosio^rieJel^^pe^d-fJ^IlLL^S'^^nla " ^Sa^al"" ' 

 y = -1.015 . 1.31.4 - 2.0842 - s.SlAE * 8.15? * 0.03SSG 



and Us"2=?s"!n In.'^l? °\uh°si:':"'°r- ^""'^^^ °f is 5. 



this equation is prese^ied'grapl'call'^L'Hg^^e^f"^' " °' "> • " 



Figure 6.— Estimated versus 

 actual soil erosion on 

 the Montana study area. 



ACTUAL SOIL EROSION (Pounds per m.lacre) 



10 



