608 SOILS: PROPERTIES AND MANAGEMENT 



residuum. The results are expressed in yield per ton of 

 manure applied : 



YIELD TO THE TON OF MANURE WHEN APPLIED IN 

 DIFFERENT AMOUNTS 



Not only is the increased efficiency from lower appli- 

 cations apparent, but a great recovery of the manurial 

 fertility in the crops also results, The Ohio experiments 

 have shown that in the first rotation after the manure 

 is applied, a recovery may be expected from a treatment 

 of 8 tons 25 to 30 per cent higher than from one of 

 16 tons. 



Evenness of application and fineness of division are 

 greatly facilitated by the use of a manure spreader. This 

 also makes possible the uniform application of small 

 amounts of manure, even as low as five or six tons to the 

 acre. It is impossible to spread so small an amount by 

 hand and obtain an even distribution. Moreover, a 

 spreader lessens the labor and more than doubles the 

 amount of manure one man can apply a day. When 

 any quantity of manure is to be handled, a manure spreader 

 will pay for itself in a season or two at the most. 



Whether manure should be plowed under or not depends 

 largely on the crop on which it is used. On timothy it 

 is spread as a top-dressing. Ordinarily, however, it is 

 plowed under. This is particularly necessary if the 



