42 BULLETIN 218, U. S. DEPARTMENT OF AGRICULTURE. 
than either fall or spring plowing. At North Platte, Hays, Dalhart, 
and Arnarillo 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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