E'EEDING RATIONS. 



171 



^' The oil cakes yield the richest manure, as they con- 

 tain a large amount both of nitrogen and phosphoric 

 acid, with a. considerable amount of potash. Next to 

 these come the leguminous seeds, malt-dust and bran. 

 Clover hay yields a richer manure than the cereal grains, 

 but meadow hay stands below them. The cereal grains 

 and the roots contain about the same proportion of 

 nitrogen in their dry substance ; the roots, however, 

 supply much more potash. Potatoes stand below roots 

 in their manurial value. Straw takes the lowest place 

 as a manure-yielding food ; bean and pea straw are 

 more valuable for this purpose than the straw of the 

 cereals. 



^'^ The ash constituents present in animal manure have 

 probably the full money value of the same constituents 

 in artificial manure, but the nitrogen has apparently a 

 lower value than the nitrosfen of ammonium salts or 



