40 CULTIVATION METHODS AND ROTATIONS FOE GREAT PLAINS. 



Table XXI is a summary of preceding tables and shows that the 

 average yields obtained from all rotations were considerably higher 

 than from continuous cropping by ordinary methods. 



As we have already shown that neither summer tillage and alternate 

 cropping nor continuous cropping with moisture-conservation meth- 

 ods gave as good net results as continuous cropping by ordinary 

 methods, we will continue to use the yields obtained by ordinary 

 methods as a basis for comparison. This table shows that the aver- 

 age yields for all tests of all rotations were better than the continuous 

 cropping yields for all three crops of wheat, oats, and barley. It also 

 shows that the averages of all tests of each rotation taken separately 

 were better for all crops, with one exception, than continuous crop- 

 ping, the one exception noted being wheat in rotation No. 9, where it 

 was sown on spring-plowed land after oats. The preceding tables 

 show these same facts in more detail. It would seem, then, that our 

 evidence was quite conclusive as to the superiority of crop rotation 

 over any of the other methods which have so far been discussed. 



Table XXI. — Summary of foregoing tables, showing average yields per acre and average 



farm values per acre. 



CONTINUOUS CROPPING AND ALTERNATE CROPPING AND SUMMER TILLAGE. 



Plat and cropping method. 



Wheat. 



Oats. 



Barley. 



C or D. Summer tillage and alternate cropping (1 crop 



Bush. 





Bush. 





Bush. 





in 2 years) 



22.5 



$13. 50 



44.1 



$13. 23 



30.7 



$11.67 



B. Continuous cropping by moisture-conservation 















methods 



16.5 



9.90 



30.5 



9.15 



22.9 



8.70 



A. Continuous cropping by ordinary methods 



17.4 



10.44 



30.2 



9.06 



21.1 



8.02 



ROTATIONS. 



Crop. 



No. 1. 



No. 2. 



No. 3. 



No. 4. 



No. 5. 



No. 6. 



No. 7. 



No. 8. 



No. 9. 



Wheat IS!;;" 



20. 87 

 $12. 52 



35. 06 

 $10. 52 



19. 68 

 $11.81 

 32. 44 

 $9. 73 



20.21 

 $12. 13 



34.00 

 $10. 20 



18.44 

 $11.06 



38. 46 

 $11. 54 



23.85 

 $14.31 



34. 92 

 $10. 47 







19.40 

 $11.64 



44.58 

 $13. 37 



16.01 

 $9.61 

 34. 34 

 $10. 30 



°»* P s u h e e '!:: 



34. 78 

 $10. 43 

 25.90 

 $9.84 



37.50 

 $11.25 

 22.83 

 $8. 67 



Barley., {" \ 

































Item of comparison. 



Wheat. 



Oats. 



Barley. 



Average vield and value per acre from rotations 



Average increase in yield compared with continuous 

 cropping by ordinary methods. '. 



Bush. 

 19.8 



2.4 



$11.87 

 1.43 



Bush. 

 36.3 



6.1 



$10. 89 

 1.83 



Bush. 

 24.4 



3.3 



$9.26 

 1.24 



187 



