CHOPPING AND SUMMER TILLAGE. 

 Table II. — Comparison of yields to the acre of oats series, by groups. 



17 



Station. 



Judith Basin, Mont. 

 Dickinson, N. Dak. . 



Do 



Edgeley, N. Dak 



Do 



Do 



Highmore, S. Dak. . . 



Do 



Bellefourche, S. Dak. 

 North Platte, Nebr.. 



Do 



Do 



Akron, Colo 



Hays, Kans 



Garden City, Kans. . . 



Dalhart, Tex 



Amarillo, Tex 



Do 



Year. 



1908 

 1909 

 1907 

 1908 

 1909 

 1907 

 1908 

 1909 

 1907 

 1908 

 i 1909 

 I 1909 

 1908 

 1909 

 1909 

 1908 

 19C9 



Average. 



Continuous cropping. 



Group A, 

 ordinary 

 methods. 



Bushels. 

 75.3 

 48.4 

 55.9 

 21.3 

 16.9 

 57.5 

 45.3 

 34.4 

 48.8 

 30.0 

 34.4 

 31.3 

 21.1 

 1.3 

 1.0 

 .0 

 20.0 

 .0 



Group B, 

 conserva- 

 tion 

 methods. 



30. 1G 



Bushels. 

 66.2 

 32.8 

 58.4 

 21.4 

 15.3 

 46.8 

 47.2 

 32.2 

 46.9 

 36.0 

 68.5 

 24.1 

 14.1 

 3.7 

 3.2 

 .0 

 32.2 

 .0 



Alternate 

 cropping, 

 Group C 

 or D, sum- 

 mer tillage. 



Bushels. 

 78.7 

 61.9 

 66.6 

 36.7 



30.5 



55.6 

 59.4 

 48.4 

 76.7 

 30.0 

 82.3 

 46.3 

 27.7 

 3.5 

 7.9 

 13.4 

 31.6 

 23.1 



44.11 



Gain ( + ) or 

 loss (-) by 

 conservation 



over ordi- 

 nary meth- 

 ods, Group B 



compared 

 withGroupA. 



Bushels. 



- 9.1 

 -15.6 

 + 2.5 

 + -1 



- 1.6 

 -10.7 

 + 1.9 



- 2.2 



- 1.9 

 + 6.0 

 +34.1 



- 7.2 



- 7.0 

 + 2.4 

 + 2.2 



.0 



+12.2 

 .0 



0.34 



Table III. — Comparison of yields to the acre of barley series, by groups. 



Station. 



Year. 



Continuous cropping. 



Group A, 

 ordinary 

 methods. 



Group B, 

 conserva- 

 tion 

 methods. 



Alternate 

 cropping, 

 Group C 

 or D, sum- 

 mer tillage. 



Gain ( + ) or 

 loss ( — ) by 

 conservation 

 over ordi- 

 nary meth- 

 ods, Group B 



compared 

 withGroupA. 



Judith Basin, Mont. . 

 Dickinson, N. Dak... 



Do 



Edgeley, N. Dak 



Do 



Do 



Highmore, S. Dak.... 



Do 



Bellefourche, S. Dak. 

 North Platte, Nebr. . 



Do 



Akron, Colo 



Hays, Kans 



Garden City, Kans. . . 



Dalhart, Tex 



Amarillo, Tex 



Do 



Average. 



1908 

 1909 

 1907 

 1908 

 1909 

 1907 

 1908 

 1909 

 1907 



1909 

 1908 



Bushels. 

 45.2 

 33.5 

 39.8 

 10.2 

 25.0 

 27.0 

 30.2 

 29.8 

 23.8 

 39.0 

 19.6 

 19.7 

 5.8 

 2.4 

 .0 

 7.9 

 .0 



21.11 



Bushels. 

 43.3 

 23.9 

 39.0 



9.4 

 24.2 

 24.7 

 37.1 

 26.0 

 25.0 

 40.0 

 43.3 

 16.8 

 12.4 



4.8 

 .0 

 13.2 



5.8 



22.88 



Bushels. 

 49.4 

 30.0 

 50.0 

 16.0 

 24.2 

 28.3 

 40.2 

 46.7 

 37.3 

 39.0 

 67.7 

 24.6 

 18.9 

 10.0 

 7.5 

 15.2 

 17.5 



30.74 



Bushels. 



— 1.9 



- 9.6 



- 2.3 

 + 6.9 



- 3.8 

 + 1.2 

 + 1.0 

 +23.7 



- 2.9 

 + 6.6 

 + 2.4 



.0 



+ 5.3 

 + 5.8 



1.76 



187 



