42 BULLETIN 218, U. S. DEPARTMENT OF AGRICULTURE. 



than either fall or spring plowing. At North Platte, Hays, Dalhart, 

 and Amarillo it yielded either the same as one of them or its place 

 was intermediate between the two. 



(6) With the exception of a sharp decrease at Akron, the yields 

 by subsoiling have not departed far from those by ordinary plowing. 

 It has not been a profitable practice, as the profits by it have been 

 less and the losses greater than by fall plowing, of which it is a modi- 

 fication and with which it should be compared. 



(7) At all stations where it has been tried, listing for oats has been 

 either more profitable or has resulted in less loss than fall plowing. 



(8) Green manuring has been productive of higher yields than 

 either fall or spring plowing, or disking corn ground, at nine of the 

 thirteen stations from which results by it are reported. The cost of 

 production by this method was so high that it showed a profit at only 

 two stations. 



(9) Oats following summer tillage produced the highest average 

 yields at all stations except Hettinger, where the yield was exceeded 

 only by that on disked corn ground. While the expense of the 

 method has prevented its being the most profitable, the degree of 

 insurance which it affords against failure of the feed crop might 

 justify its practice in oat production in at least some sections of the 

 Great Plains. 



(10) Disking corn ground yielded the highest profits of any method 

 tested at all stations except Garden City and Dalhart. At these two 

 stations the crop was produced at a loss, but this loss was less than 

 by any other method, 



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