THE USE OF MANURE 157 



merits, while 5 per cent, of the nitrogen is lost by 

 volatilization. It is estimated that half of the nitro- 

 gen and potash of 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 



3r|ariic : Matter Bj:|' 



4. Sja- 



Fig. 29. Good manure. Fig. 30. Poor manure. 



i. Nitrogen. 2. Phosphoric acid. 

 3. Potash. 4. Mineral matter. 



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 potasli 

 are utilized for the production of flesh and milk. 



The comparative 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 



in urine. 

 250-=- 2 125 Ibs. nitrogen 

 400 -r- 2 = 200 Ibs. potash 



