28 



BULLETIN 219. U. S. DEPARTMENT OP AGRICULTURE. 



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Figure 6, prepared from Table VIII, shows graphically the average 

 relative profit or loss attending the use of each of the five methods at 

 each of the stations. 



Table XVIII, illustrated in part in figure 4, shows that during the 

 years covered by this work creditable average yields of grain have 

 been obtained by all methods at Huntley, Williston, Dickinson, 

 Scottsbluff, North Platte, and Akron, and by one method at Belle 

 Fourche and Dalhart. No grain has been produced either at the 



Judith Basin Field 

 -*■ Station or at Garden 

 City. 



Little difference is 

 shown in the average 

 yields of grain by the 

 different cultural 

 methods in use at 

 Williston, Edgeley, 

 Hays, and Amarillo. 

 At Dickinson, Belle 

 Fourche, and Dalhart 

 the only method of 

 preparation giving 

 yields departing far 

 from the others has 

 been that of summer 

 tillage. At Dickinson 

 summer tillage has 

 been responsible for 

 a decrease in yields 

 and at Belle Fourche 

 and Dalhart for an 

 increase. 



Between the yields 

 following fall and 

 spring plowing little 

 general difference is 

 to be noted, except 

 that at Huntley fall plowing has been better than spring plowing, and 

 at Scottsbluff fall plowing after corn has been better and fall plowing 

 after small grains poorer than spring plowing after either. At some 

 stations more difference is to be noted as a result of crop sequence 

 than as a result of difference in time of plowing. At Huntley corn 

 has been better after small grain than after corn. At both North 

 Platte and Akron corn after corn by both fall and spring plowing 

 has been markedly better than corn after small grain. 



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 Fig. 4. 





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Graphs showing the average yields of corn in bushels per 

 acre by different methods at eleven field stations in the Great 

 Plains area. The methods of tillage are indicated by Arabic 

 numerals at the top, as follows: 1, Fall plowing after corn; 2, fall 

 plowing after small grain; S, spring plowing after corn; 4, spring 

 plowing after small grain; 5, summer tillage. The field stations 

 of Judith Basin and Garden City do not appear, because the corn 

 grown at these stations produced no grain. 



