

THE USE OF MANURE 



169 



the food is voided in the urine. On account of the 

 scant amount and poor quality of the food no milk or 

 flesh is produced. 



On another farm 7.5 tons of clover hay and 2.5 tons 

 of bran are fed. The liquid excrements are collected 



Fig. 29. Good manure. 



Fig. 30. Poor manure. 



and the manure is taken directly to the field and 

 spread. It is estimated that 20 per cent, of the nitro- 

 gen and 4 per cent, of the phosphoric acid and potash 

 are utilized for the production of flesh or milk. 



The relative value of the manures from the two 

 farms is as follows : 



Farm No. i. 



In 10 tons timothy. 

 Lbs. 



Nitrogen 250 



Phosphoric acid 90 



Potash 400 



Loss in urine. 

 250 -7- 2 = 125 lbs. nitrogen 

 400 -5- 2 = 200 lbs. potash 



