32 BULLETIN 222, TJ. S. DEPARTMENT OF AGRICULTURE. 



stations. The only profit shown at any of these stations is 35 cents 

 an acre on disked corn ground at Belle Fourche. 



(3) The highest average yields at eleven of the fourteen stations 

 have been by summer tillage. On the average, it increased the 

 yields nearly one-half over those produced on land cropped in the 

 preceding year. On account of its cost it has not been the most 

 profitable method of production. 



(4) At ten of the fourteen stations under study disked corn 

 ground produced higher yields than from either the fall plowing or 

 the spring plowing of barley stubble. It has been the most profitable 

 method under trial at all the stations except Hettinger. 



(5) The relative advantage of either fall or spring plowing is 

 largely dependent upon the season. In the general average of the 

 thirteen stations at which each method has been tried there is prac- 

 tically no difference. At only three stations has there been an 

 average difference of over 2 bushels per acre between the two meth- 

 ods. At the four more southern stations fall plowing has been bet- 

 ter than spring plowing. 



(6) At the seven stations where subsoiling for barley has been 

 tried it has produced an average of only 0.4 of a bushel more than 

 fall plowing. At only two stations has there been a marked difference 

 in the results of the two methods. At one of these, subsoiling has 

 been responsible for an increase and at the other for a decrease in 

 yield. 



(7) At eight stations listing instead of plowing has been tried. 

 While the resulting yields have not been materially different from 

 those on fall-plowed land, the lower cost of listing has made it the 

 more profitable method. 



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