518 XATFRB AND PROPERTIES OF SOILS 



pliorie acid, and 65 per cent, of the potash. This means a loss 

 of at least one-half of the nutrient constituents of the ma- 

 nure and considerably over one-half of the fertilizing value, 

 since the elements wasted are those most readily available to 

 plants. Considering the losses which the food sustains during 

 digestion and the waste of the manure in handling and stor- 

 age, it cannot be expected that more than 25 per cent, of the 



Table CXIII 



LOSSES FROM MANURE THROUGH LEACHING AND 

 FERMENTATION. 



Kind of Manure 



Horse ^ 



Horse ^ 



HOKSB ^ 



Cow^ 



Cow' 



Steeb * 



Days exposed. . , . 



183 



183 



274 



183 



77 



91 



Percentage loss of 















ammonia 



36 



60 



40 



41 



31 



30 



Percentage loss of 















phosphoric acid 



50 



47 



16 



19 



19 



23 



Percentage loss of 















potash 



60 



76 



34 



8 



43 



58 



organic matter, 30 per cent, of the ammonia, 50 per cent, of 



the phosphoric acid, and 30 per cent, of the potash of the 



original crop will reach the land.^ Even if leaching losses 



^ Eoberts, I. P., and Wing, H. H., On the Deterioration of Farmyard 

 Manure hy LeaeMng and Fermentation; Cornell Agr. Exp. Sta., Bui. 13, 



*Sclintt, M. A., Barnyard Manure, Canadian Dept. Agr., Centr. Exp. 

 Farms, Bui. 31, 1898. 



^ Thorne, C. E., Farm MamureSj p. 146 ; New York, 1914. 



"* Thome, C. E.^ and others, The Maintenance of Fertility; Ohio Agr. 

 Exp. Sta., Bui 183, 1907. 



^Voelcker and Hall have drawn up recommendations for the compen- 

 sation of the out-going English tenant for manure produced on the farm 

 but not realized on. They suggest that he receive pay at f ertihzer prices 

 for one-half of the nitrogen, three-fourths of the phosphoric acid, and 

 all of the potash contained in the food consumed during the last year 

 of tenancy. For th« second, third, and fourth years previous, the com- 

 pensation value shall be one-half that of the year immediately preced- 

 ing. Voelcker, A., and Hall, A. D., The Valiuition of Unexhausted 

 Manures; Jour. Roy. Agr. Soc, Eng., Vol. 63, pp. 76-114, 1902. 



