1917.1 



PUBLIC DOCUMENT — No. 31. 



55 a 



it was spread, and on the south half, where it was put into a 

 large pile. Carefully preserved manure from well-fed dairy 

 cows was applied to the first four pairs of plots, and stable 

 manure from horses was applied to the fifth pair. The experi- 

 ment began in 1899, the manure being applied annually through 

 1911. Since then no manure or fertilizer has been applied the 

 object since 1911 being to test the residual effect of the two 

 systems of manuring. 



The results indicated that the difference between the two 

 systems of manuring was small, but almost invariably in favor 

 of the practice of piling in winter and spreading in the spring. 

 This is not only true of the period (1899-1911) when manure 

 was applied annually, but also true of the period (1911-14) 

 when no manure or fertilizer was applied. 



In planning the lime experiment which began in 1914 it was 

 decided to use four kinds of lime, as shown in the following 

 table: — 



In the spring of 1914 the different forms of lime already men- 

 tioned were applied in such quantities as to supply equal 

 amounts per acre of calcium and magnesium oxides. No 

 fertilizer or manure has been applied since 1911, and only one 

 application of lime has been made. In 1914 and 1915 the crop 

 was soy beans. This year the crop was field corn. The follow- 

 ing table gives the yields per acre of all the crops since the 

 beginning of the experiment : — 



