18 



BULLETIN 214, U. S. DEPARTMENT OP AGEICULTUEE. 



realize a maximum benefit from the water previously stored in the 

 soil by some methods. The crop of 1914 was damaged at least 25 

 per cent by hail shortly before harvest. 



Table VIII. — Yields and cost of production of spring wheat by different methods at the 

 Dickinson Field Station, 1908 to 1914, inclusive. 



Treatment and 



Number 

 of plats 

 averaged. 



Yield per acre (bushels). 



previous crop. 



1908 



1909 



1910 



1911 



1912 



1913 



1914 



Average. 



Fall plowed: 



Corn 



1 

 1 

 2 

 1 



35.0 



33.8 

 19.7 

 17.7 



37.3 

 40.7 

 34.7 

 25.2 



24.0 

 22.5 

 19.2 

 18.2 



4.7 



3.2 



.7 



1.4 



1H 

 H 

 H 

 H 



H 

 H 

 H 



H 



H 

 H 

 H 



H 



27.5 

 27.5 

 26.8 

 20.5 



15.9 

 13.2 

 11.3 

 8.9 



24.1 



Manured corn 



23.5 



18.7 



Wheat 



15.3 







'*" Total or average. . . 



5 



25.2 



34.5 



20.6 



2.1 



25.8 



12.1 



20.1 



Spring plowed: 



1 

 1 

 1 



35.0 

 18.7 

 24.3 



39.7 

 30.7 

 26.8 



27.8 

 18.1 



17.4 



14.0 

 1.3 

 5.7 



28.0 

 17.0 

 13.5 



12.0 

 15.2 

 10.5 



26.1 





16.8 



Wheat 



16.4 







Total or average. . . 



3 



26.0 



32.4 



21.1 



7.0 



19.5 



12.6 



19.8 





9 



32.3 



37.9 



22.7 



3.8 



27.8 



,15.3 



23.3 







Green manured: 



Rye 



2 

 2 



1 



32.1 

 30.0 

 31.0 



38.3 

 36.0 

 32.3 



19.7 

 17.4 

 19.0 



5.6 

 1.2 

 1.3 



28.0 



24.8 

 24.5 



20.0 

 18.6 

 13.7 



24.0 





21.3 





20.3 







Total or average. . . 



5 



31.0 



36.1 



18.6 



3.0 



26.0 



18.2 



22.2 





3 



33.6 



36.9 



26.0 



22.1 



27.2 



19.2 



27.5 











30.0 



36.1 



21.7 



5.9 



25.9 



15.4 



22.5 









Summary of Yields and Digest of Cost. 





Tillage treatment. 



Previous crop. 



Yields, values, etc. (average 

 per acre). 



Fall 



plowed 

 (5 plats). 



Spring 

 plowed 

 (3 plats). 



Disked 

 (9 plats). 



Green 

 manured 

 (5 plats). 



Summer 



tilled 

 (3 plats). 



Corn 



(12 plats). 



Small 



grain 



(5 plats). 



Yields of grain: 



1908 bushels.. 



1909 do.... 



1910 do.... 



1911 do.... 



1912 do.... 



1913 do.... 



1914 do.... 



25.2 



34.5 



20.6 



2.1 



H 



25.8 

 12.1 



26.0 

 32.4 

 21.1 

 7.0 

 H 



19.5 

 12.6 



32.3 

 37.9 

 22.7 

 3.8 

 H 

 27.8 

 15.3 



31.0 



36.1 



18.6 



3.0 



H 



26.0 

 18.2 



33.6 

 36.9 

 26.0 

 22.1 

 H 

 27.2 

 19^2 



33.0 



38.3 

 23.2 

 4.9 

 H 

 27.8 

 14.9 



20.0 

 30.4 

 18.4 

 2.0 

 H 

 20.9 

 11.4 





20.1 



19.8 



23.3 



22.2 



27.5 



23.7 



17.2 







Crop value, cost of production, 

 etc.: 



$14.07 

 6.56 



$13.86 

 6.09 



$16.31 

 4.75 



$15. 54 

 14.61 



$19.25 

 11.50 







Cost 













Profit 



7.51 



7.77 



11.56 



.93 



7. 75 













1 H= Destroyed by hail. 



Some indications shown in Table VIII are rather striking. The 

 effect of the preceding crop and the preparation for spring wheat 

 divide rather sharply into two groups, as indicated by the results 

 obtained. When wheat followed summer tillage, corn, or green 

 manure it has given comparatively high yields. When it followed 



