New York Agricultural Experiment Station, 63 



Castor-Bean Pomace is a by-product of castor-oil factories ; it is 

 made by about tlie same process as that used in producing cotton- 

 €eed-meal. As a rulcj it has less fertilizing value than cottonseed- 

 meal, one ton containing about 110 pounds of nitrogen, 40 pounds 

 of phosphoric acid and 20 pounds of potash, 



(3) Commercial Fertilizing Materials Containing Animal Nitro- 

 gen Compounds. 



Probably the larger proportion of the nitrogen occurring in com- 

 mercial fertilizers is furnished by animal matter in one form or 

 another. This material comes mainly from slaughter houses, ren- 

 dering works and fish-oil factories. The following list contains 

 most of the substances of animal origin commonly used: Azotin or 

 ammonite., dried Mood, dried fish, fish-scraps, ground fish, hair, 

 hoof -meal, horn-dust, leather-scraps, nitrogenous guanos, ta/)ilcage, 

 wool-waste, etc. 



Azotin or Ammonite consists of dried and ground meat, tendons, 

 membranes, etc, from which fat has been extracted. It usually 

 contains over 10 per cent, of niti-ogen along with 3 or 4 per cent, of 

 phosphoric acid. 



Dried Blood consists of blood obtained from slaughtering animals; 

 it is prepared for market by evaporating, drying and grinding. The- 

 color varies with the degree of heat employed in drying, ranging 

 from red to black. That from hogs is usually more red than that 

 from cattle. One hundred pounds of dried blood contain from 10 

 to 15 pounds of nitrogen. 



Dried Fish, Fish-Scraps, and Ground Fish consist of refuse 

 from fish-oil works ; it is dried and ground for market, ^t is 

 more valuable according as it is finer and drier. Dried, ground 

 fish, of good quality, contains from 7 to 8 per cent, of nitrogen, 

 together with as much or more phosphoric acid. 



Hair is obtained from slaughter-houses; it is oft'i mixed with 

 dried blood and other forms of animal matter. ^ contains about 

 15 per cent, of nitrogen. 



Hoof-Meal and Horn-Dust are by-produrs containing 10 to 

 15 per cent, of nitrogen and about 2 per ce''- ^^ phosphoric acid. 

 They are sometimes treated with superheate'^^*^^'^ or with sulphuric 

 acid, the treatment rendering the nitroge- compounds more readily 

 available. 



