12 



BULLETIN 214, U. S. DEPARTMENT OF AGRICULTURE. 



permit the taking of satisfactory samples for the study of soil moisture. 

 Enough has been done, however, to make certain that only a limited 

 supply of water available to the crop can be stored in the soil. This 

 shallowness of the soil and the consequent limitation of the supply of 

 water that can be stored in it and recovered by a crop make the crop 

 dependent in large part upon the rains that fall while the crop is 

 growing. 



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

 Judith Basin Field Station, 1909 to 1914, inclusive. 



Treatment and previous crop. 



Number 

 of plats 

 aver- 

 aged. 



Yield per acre (bushels). 



1909 



1910 



1911 



1912 



1913 



1914 



Average. 



Fall plowed: 



2 

 2 



1 



31.3 

 36.8 

 33.4 



13.2 

 11.5 

 14.0 



21.4 

 24.7 

 22.0 



H 

 H 



H 



H 

 H 



H 

 H 

 H 



H 

 H 



H 



24.9 

 23.5 

 18.5 



18.1 

 19.1 

 15.8 



21.8 





23.2 



Wheat 



20.7 









5 



33.9 



12.7 



22.8 



23.1 



18.0 



22.1 







Spring plowed :- 



1 

 2 

 2 



33.1 



6 31.6 



35.6 



11.6 

 10.0 

 9.2 



21.3 



20.8 

 24.1 



23.8 

 24.1 

 25.4 



18.5 

 18.1 

 16.7 



21.7 





20.9 



Wheat 



22.2 









5 



c34.0 



10.0 



22.6 



24.5 



17.6 



21.7 









1 

 1 



8 



33.3 

 36.3 

 35.0 



8.3 

 15.0 

 10.8 



26.5 

 23.5 

 23.9 



23.3 

 22.8 

 23.6 



17.1 

 16.5 

 19.4 



21.7 





22.8 





22.5 







Green manured: 



Rye 



1 

 1 



34.0 

 28.3 



9.0 

 11.0 



19.0 

 20.5 



28.0 

 20.5 



15.1 

 13.3 



21.0 



Peas 



19.7 







Total or average 



2 



31.2 



10.0 



19.8 



24.3 



16.7 



20.4 







Summer tilled 



4 



<*34.1 



7.2 



20.1 



22.9 



19.5 



20.8 







Average of all 26 plats 





34.1 



10.6 



22.6 



23.6 



18.4 



21.9 









Summary of Yields and Digest of Cost. 





Tillage treatment. 



Previous crop. 



Yields, values, etc. (average 

 per acre). 



Fall 

 plowed 



(5 

 plats). 



Spring 

 plowed 



(5 

 plats). 



Disked 



(8 

 plats.) 



Listed 

 (1 



plat). 



Sub- 

 soiled 



(1 

 plat). 



Green 

 ma- 

 nured^ 

 plats). 



Sum- 

 mer 

 tilled 



(4 

 plats). 



Corn 

 (11 



plats). 



Small 

 grain 



(9 

 plats). 



Yields of grain: 



1909 bushels.. 



1910 do.... 



1911 do.... 



1912 do.... 



1913 do.... 



1914 do.... 



33.9 



12.7 



22.8 



H 



23.1 



18.0 



c34.0 



clO.O 



c22.6 



H 



24.5 

 17.6 



35.0 



10.8 



23.9 



H 



23.6 



19.4 



33.3 

 8.3 

 26.5 

 H 



23.3 

 17.1 



36.3 



15.0 



23.5 



H 



22.8 



16.5 



31.2 



10.0 



19.8 



H 



24.3 



16.7 



<*34.1 

 (2 7.2 

 20.1 

 H 



22.9 

 19.5 



*34.1 

 ell. 3 



23.2 

 H 



23.8 

 19.1 



Z34.9 

 /ll.l 

 /23.8 

 H 



23.4 

 17.5 





22.1 



21.7 



22.5 



21.7 



22.8 



20.4 



20.8 



21.9 



22.1 







Crop value, cost of produc- 

 tion, etc.: 



$15. 47 

 6.56 



$15. 19 

 6.09 



$15. 75 

 4.75 



$15. 19 

 5.55 



$15. 96 

 7.17 



$14.28 

 14.61 



$14. 56 

 11.50 







Cost 















8.91 



9.10 



11.00 



9.64 



8.79 



- .33 



3.06 













a H= Destroyed by hail. 

 b Yield of 1 plat only. 



« Average of 4 plats. 

 d Average of 3 plats. 



e Average of 10 plats. 

 /Average of 8 plats. 



