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



With the exception of a sharp decrease from subsoiling at Akron 

 and a similar increase from listing at Garden City, the yields from 

 each of these practices have not departed far from the yields of 

 ordinary plowing. Some of the details of departure or lack of it 

 have been discussed in dealing with separate stations where closer 

 comparisons could be drawn with exactly similar stubble. 



Green manuring averaged as a group was productive of higher 

 yields than either fall or spring plowing or disking corn ground at 

 9 of the 1 3 stations for which results with this method are reported. 

 At Dickinson this method was exceeded by disking corn ground. At 

 Hettinger, Akron, and Dalhart green manuring gave poorer yields 

 than any of the three other methods mentioned. At Amarillo this 

 method gave yields exceeding those by fall plowing. 



Of all the methods under trial, as grouped in Table XIX, summer 

 tillage produced the highest yields at every station except Hettinger, 

 where is was exceeded only by yields on disked corn ground. Aver- 

 aged for all the stations, its increase of yield over fall plowing lacked 

 one- tenth of a bushel of being 10 bushels per acre. The greatest 

 departure from this general average was at Scottsbluff, where the 

 increase was 20 bushels per acre. 



Sod breaking as a preparation for oats has very generally stood 

 at or near the bottom of the list, as is discussed in some detail under 

 each station where it has been on trial. 



As values and cost of production are here figured, it is seen in Table 

 XIX that oats have been produced at a profit by at least one method 

 at all stations except Garden City and Dalhart. At two stations, 

 Judith Basin and Huntley, a profit has been realized by all methods. 



Generally speaking, good yields have combined with low cost of 

 production to make disked land which has been chiefly corn ground 

 show the greatest profit at all stations where a profit has been realized 

 from any method. 



At all stations where it has been tried, listing either has been more 

 profitable or has resulted in less loss than fall plowing. 



Subsoiling has yielded a profit at two stations and a loss at six. 

 It can not be said, however, that it was a profitable practice at any 

 station, as its profits were less and its losses greater than those of fall 

 plowing. It should be compared with fall plowing, as it is a modifi- 

 cation of that method. 



At all the ten stations north of Hays, except Belle Fourche and 

 North Platte (where the losses were 44 cents and 29 cents, respec- 

 tively), spring plowing was productive of profitable crops. At Hays 

 the average loss from it was only 56 cents per acre. At Amarillo the 

 loss increased to $ 1 .3 1 . At Garden City and Dalhart spring plowing, 

 in common with all other methods, shows a loss. 



