502 NATURE AND PROPERTIES OF SOILS 



In every case except that of swine, the urine is much the 

 richer than the dung in ammonia, containing on an average 

 more than twice as much when compared on the percentage 

 basis. The urine is also richer in potash than the solid, aver- 

 aging for the four classes of animals 1.29 per cent, as com- 

 pared to 0.34 per cent, contained in the solid manure. Most 

 of the phosphoric acid, however, is contained in the solid ex- 



55% 



45% 





II 



& 



/oo% 



35% 



TXACE 



€5% 



- 



OL/A/G. ue/rt£. 



PU/VG. 1/&A/E. 



PU/V6. UE/NE. 



Fig. 61. — Diagram showing the distribution of ammonia, phosphoric 

 acid and potash between the dung and urine of average farm 

 manure. 



crement, only traces being found in the urine except in the 

 case of swine. It is, therefore, evident that the urine, pound 

 for pound, is more valuable insofar as the nutrient elements 

 are concerned. The advantage leans heavily toward the 

 urine also in that the constituents therein contained are im- 

 mediately available; this cannot be said of the solid manure. 

 283. Liquid versus solid manure. — While the urine car- 

 ries more nutrients to an equal weight than the dung, it yet 

 remains to be seen whether in the total excreta voided by an 

 animal there are more nutrients in the urine than in the dung. 



