224 



SOILS AND FERTILIZERS 



Constituents 



Water 



Dry matter 



Nitrogen 



Phosphoric acid 



Potash 



Pounds 

 Per Ton 



1460 



540 



10 



5 



12 



Assuming that one-half of the nitrogen, one-fifth of the 

 phosphoric acid and one-half of the potash are readily avail- 

 able, twenty tons of mixed manure would be equivalent to 

 one ton of a 5-1-6 fertilizer. Comparing this with any 

 ordinary fertilizer, it is evident that it is high in nitrogen 

 and very low in available phosphoric acid. This suggests 

 that for its most effective use farm manure should be sup- 

 plemented by some form of phosphoric acid. As an illustra- 

 tion of the advantage of supplementing farm manure by 

 phosphoric acid see Table 52. 



281. Quantities of manure voided by animals. — An idea 

 of the quantity of excreta, solid and liquid, produced by 

 different animals may be obtained from the following table : 



Table 46. 



Excreta from Various Farm Animals to the 1000 

 Pounds Live Weight 



282. Effect of food on composition of manure. — The 

 richer the food in nitrogen and other plant-food materials, 

 the more of these there will be in the manure. This has 



