ROTATION AND CULTURAL METHODS AT EDGELEY, N. DAK. 21 







o—o OATS FOLLOWING FALLOW jj 





in 



s 





*--- *OATS " WHEAT A 





60 

 70 



















/3 



f\ 



























// 

 // 





























// 



\\ 











60 

 50 

 40 

 30 









) 



: 





h 



\ \ 







\\ 















1 



it 

 / 1 

 # / 



1 



\ 





ft 

 II 









M 















/ / 

 / / 



v 





ii 

 I 1 



\ \ 

 \ 



/ 





ll 















1 1 



i I 









1 



i 





.11 

 \\ 



ll 











> 



f\ 



















\) 











20 



10 











\l 













\ 



i 







\ ; 



« 





















i 



V 



1* 



k\ 































190 



'08 '09 1910 'II '12 '13 '14 '15 '16 '17 '18 19 



19 



35 

















































Ii 













30 





















Ii 

























h 

 1 1 



* \ 





P 

 II 













25 

 20 

 15 

 10 

 5 

















\ \ 





II 

















/ 1 

 / 1 

 f ' 









\ 





r 



SI 















/ 



/ 

 / 







ii 

 Ii 



\ 





Ii 



u 













< 



r . 



/ 

 / 

 1 



n 















L * 



V 

 f x 







J 



..«" 



*» 





« 

















\ 



kY 















^^C" 

















N\ 

















N 



1 

















o— 



X- 



— O WHEAT FOLLOWING FALLOW 

 " * WHEAT " OATS 





Fig. 4. — Diagram showing the data presented in Tahle II. The upper part of the fig- 

 ure gives the yield of oats on fallow in rotation, No. 8 and following wheat in rota- 

 tion No. 5 for the years 1907 to 1919. The lower portion shows the yield of wheat 

 on fallow in rotation No. 5 and following oats in rotation No. 8. In each part of 

 the diagram the yields on fallow are shown by circles connected by a solid line 

 and the yields following a grain crop by crosses connected by a broken line. 



