1912.1 



PUBLIC DOCUMENT — No. 31. 



41 



The plan of cropping this field for the last thirteen years has 

 been corn and hay in rotation in periods of two years for each. 

 During the past season the crop has been corn. The rates of 

 yield per acre are shown in the following table: — 



Yield per Acke. 



Hard Corn 



(Bushels). 



Soft Corn 

 (Bushels). 



Stover 

 (Pounds). 



Plot 1, niauure alone. 



Plot 2, manure and potash, 



Plot 3, manure alone. 



Plot 4, manure and potash, . 



Averages: — 

 Plots 1 and 3, manure alone, . 

 Plots 2 and 4, manure and potash. 



89.140 

 85.260 

 88.570 

 83.490 



88.855 

 84.375 



2.460 

 1.430 

 2.230 

 1.890 



2.345 

 1.660 



4,780 

 4,740 

 4,580 

 4,580 



4,680 

 4,660 



The crop on all the plots was an excellent one, and it will 

 be noted that the larger ap])lication of manure alone gave a 

 yield of hard corn about 4i/^ bushels greater than that pro- 

 duced on the smaller amount of manure and potash. The com- 

 bination produced a slightly smaller yield both of soft corn 

 and stover. The difference in crop is not sufficiently great to 

 cover the difference in cost between the two systems of ma- 

 nuring. 



IV. Average Coex Fektilizek compared "with Fertilizer 

 Richer ix Potash. 



These experiments are carried on on what is known as our 

 north corn acre, which is divided into 4 one-quarter acre plots. 

 Tlie experiments began in 1891. Continued corn culture was 

 the rule at first, but for the past sixteen years corn and hay, two 

 years of each, have regularly alternated. Two of the plots in 

 the field, 1 and 3, are fertilized with a home-made mixture 

 furnishing nitrogen, phosphoric acid and potash in highly avail- 

 able forms, and in the same proportions in whicli they are con- 

 tained in the average corn fertilizer offered on our markets. 

 The other two plots are fertilized annually with a home-made 

 mixture containing much less phosphoric acid and more potash 

 than is applied to the other plots. 



