CROP ROTATION COMPARED WITH CONTINUOUS CROPPING. 



35 



Table XV. — Yield of ivheat, in bushels per acre, in seven 3-year rotations compared 

 with continuous cropping. 



Station. 



Year. 



Judith Basin, Mont. . 

 Dickinson, N. Dak. . 



Do 



Edgeley, N. Dak 



Do 



Do 



Highmore, S. Dak. . . 



Do 



Do 



Bellefourche, S. Dak. 

 North Platte, Nebr. . 



Do 



Do 



Akron, Colo 



Hays, Kans 



Garden City, Kans. . 



Dalhart, Tex 



Amarillo, Tex 



Do 



Average 



Average from continuous 

 cropping 



Gain per acre by rotation 

 compared with contin- 

 uous cropping 



19C9 

 1908 

 19C9 

 1907 

 1908 

 19C9 

 1906 

 1907 

 1908 

 1909 

 1907 

 1908 

 1909 

 1909 

 1908 

 1909 

 1909 

 1908 

 1909 



No. 1. 



Wheat 

 disked, 

 oats fall 

 plowed, 

 corn fall 

 plowed. 



No. 2. 



Wheat 



spring 

 plowed, 

 oats 



spring 

 plowed, 

 corn 



spring 

 plowed. 



Bushels. 

 34.8 

 a 35. 8 

 a 39.8 

 a 16. 7 

 a 24.0 

 a 33.0 

 26.7 

 21.5 

 24.3 

 29.4 

 22.3 

 28.6 

 21.7 

 a 25.0 

 3.7 

 1.0 

 .0 

 8.3 

 .0 



Bushels. 

 33.1 

 35.0 

 39.7 

 13.2 

 15.8 

 32.6 

 27.3 

 29.0 

 25.2 

 23.9 

 23-7 

 24.0 

 17.2 

 20.8 

 1.5 

 4.0 

 .0 

 8.0 

 .0 



20.87 

 17.39 



19.68 

 17.39 



3.48 



No. 3. 



Wheat 



fall 

 plowed, 

 oats fall 

 plowed, 

 corn fall 

 plowed. 



No. 4. 

 Oats 

 disked, 

 wheat 



fall 

 plowed, 

 corn fall 

 plowed. 



Bushels. 

 31.0 

 35.0 

 37.3 

 12.6 

 20.8 

 32.5 

 25.5 

 27.2 

 25.7 

 29.9 

 20.7 

 27.7 

 a 24. 3 

 19.2 

 3.9 

 2.2 

 .0 

 8.5 

 .0 



Bushels. 

 33.3 

 18.8 

 34.3 

 10.5 

 15.7 

 28.5 

 25.0 

 29.0 

 21.8 

 29.7 

 24.2 

 31.3 

 16.8 

 10.6 

 «6.7 

 .9 

 .0 

 13.2 

 .0 



No. 5. 

 Wheat on 

 fallow, 

 oats fall 

 plowed, 

 fallow. 



20.21 18.44 

 17.39 j 17.39 



2.82 



Bushels. 

 38.0 

 33.0 

 37.7 

 11.8 

 19.5 

 29.8 

 a31.7 

 a 33. 3 

 a 29.0 

 31.4 

 26.0 

 a 42. 2 

 27.2 

 18.2 

 4.1 

 06.6 

 a 7. 7 

 a 16. 5 

 9.5 



23.85 

 17.39 



4S 



Station. 



Year. 



1909 

 1908 

 1909 

 1907 

 1908 

 1909 

 1906 

 1907 



Judith Basin, Mont 



Dickinson, N. Dak 



Do 



Edgeley, N. Dak I 



Do 



Do 



Highmore, S. Dak 



Do 



Do 



Bellefourche, S. Dak 1909 



North Platte, Nebr \ 1907 



Do I 1908 



Do 1909 



Akron, Colo 1909 



Hays, Kans | 1908 



Garden City, Kans 1909 



Dalhart, Tex 



Amarillo, Tex 



Do 



Average 



Average from continuous cropping. 



Gain (or loss) per acre by rotation com- 

 pared with continuous cropping 



1909 



1909 



No. 9. 

 Oats 



spring 

 plowed, 



wheat 



spring 

 plowed, 

 corn 



spring 

 plowed. 



Bushels. 

 31.6 

 18.7 

 30.7 



4.2 

 13.5 

 25.8 

 25.7 

 24. 5 

 24.2 

 26.1 

 20.8 

 17.5 

 16.7 

 14.3 



2.2 



2.5 

 .0 



5.3 

 .0 



Average 

 yield. 



Bushels. 

 34.59 

 28.11 

 36.36 

 11.07 

 17.09 

 29.73 

 26.70 

 28. 17 

 25.34 

 29. C9 

 23.71 

 28.94 

 20.10 

 17.00 

 3.76 

 3.00 

 1.10 

 10.50 

 1.36 



Yield 

 from con- 

 tinuous 

 cropping. 



16.01 

 17.39 



19.78 

 17.39 



2.39 



Bushels. 

 33.0 

 24.3 

 26.8 

 4.1 

 13.3 

 28.3 



28.8 

 26-3 

 23.8 

 24-5 

 22.7 

 23.0 

 14.3 

 1.2 

 2.1 

 .0 

 17.0 

 .0 



17.39 



Average of all rota- 

 tions compared 

 with continuous 

 cropping. 



Gain. 



Bushels. 

 1.59 

 3.81 

 9.56 

 6.97 

 3.79 

 1.43 



5. 29 

 "6.' 24 



2.70 

 2.56 

 .90 

 1.10 



1.36 



187 



a Rotation giving the best yield of wheat. 



