22 BULLETIN" 219, U. S. DEPARTMENT OF AGRICULTURE. 



where corn follows corn as compared with corn following small grain 

 is much greater in the grain than in the stover yields. Following 

 sorghum there was a sharp decrease in yield. In rotations where 

 corn followed oats on brome-grass and alfalfa sods the yield was 

 considerably less than that obtained on similarly prepared land that 

 had not been in sod. 



Land that was summer tilled the previous year produced six good 

 crops of grain in the eight years under study. In the other two years 

 it did not produce sufficient grain to warrant husking. During the 

 six years the average yield of grain was about 2 bushels more and 

 the yield of fodder about 300 pounds more per acre by summer tillage 

 than that produced by spring plowing corn ground, the next highest 

 yielding method. 



On spring-plowed corn ground the average value of the crop of 

 grain alone has been more than sufficient to pay the cost of producing 

 the crop. On fall-plowed corn ground the average value of the grain 

 for eight years has lacked only 20 cents of paying the cost of pro- 

 duction. All methods show a profit when a value is assigned to the 

 stover or fodder. The profits per acre from the different methods have 

 been as follows: Summer tillage, $1.38; fall plowing after small 

 grain, $2.12; spring plowing after small grain, $2.78; fall plowing 

 after corn, $4.56; and spring plowing after corn, $5.17. 



AKRON FIELD STATION. 



Table XIII presents the results of the work of six years in methods 

 of production of corn at Akron, Colo. All methods have produced 

 fodder every year. Summer-tilled land has produced a grain crop 

 every year, its average yield for the entire period being 20.9 bushels 

 of grain and 2,257 pounds of stover per acre. Other methods have 

 met from one to three more or less complete failures of the grain 

 crop. The average yield of corn after corn by both spring and fall 

 plowing, however, has been practically the same as on summer-tilled 

 land. 



Corn after small grain was markedly poorer in yield of both grain 

 and stover than corn following corn by either fall or spring plowing. 

 Subsoiling the land where corn follows corn resulted in decreased 

 yields every year as compared with fall plowing similar land without 

 subsoiling it. Planting with the lister resulted in a still further 

 decrease in yields. 



The difference in the results following fall and spring plowing are 

 negligible when the average of the whole series of years is considered. 

 Fall and spring plowing of land where corn follows corn are the only 

 methods that show a profit from the grain crop alone. When a value 

 is assigned to the stover, all methods show profits ranging from 51 



