134 SOILS AND FERTILIZERS 



Soluble in prepared 



pepsin solution. 

 Per cent, of nitrogen. 



*6" 



Dried blood 94.2 



Ground dried fish 75.7 



Tankage 73.6 



Cottonseed meal 86.4 



Hoof and horn meal 30.0 



Leather • 16.7 



158. Peat and Muck. — Many samples of peat and 

 muck are quite rich in nitrogen. The nitrogen is, 

 however, in a very insoluble form, and is with diffi- 

 culty nitrified. When mixed with stable manure, 

 particularly liquid manure, with the addition of a lit- 

 tle lime, fermentation may be induced, and a valuable 

 manure produced. Muck or peat should be dried and 

 sun-cured, and then used as an absorbent m stables. 

 Peat differs from muck in being fibrous. If the muck 

 gives an acid reaction, lime (not quicklime) should be 

 used with it in the stable, as directed under farm 

 manures. When easily obtained muck is one of the 

 cheapest forms of nitrogen. 



Composition of Muck Samples. 16 



Nitrogen. 

 Per cent. 



Marshy place, producing hay 2.21 



Marshy place, dry in late summer 2.01 



Old lake bottom 1.81 



159. Leguminous Crops as Nitrogenous Manures. 

 — The frequent use of leguminous crops for manurial 

 purposes is the cheapest way of obtaining nitrogen. 

 When the crop is not removed from the land but is 



