230 TALKS ON MANURES. 



used, arc in many respects the same as were adopted in the wheat 

 experiments already given. The mineral or ash constituents -were 

 supplied as follows : 



Potash as sulphate of potash. 

 Soda as sulphate of soda. 

 Magnesia as sulphate of magnesia. 

 Lime as sulphate, phosphate, and superphosphate. 

 PJwsphoric acid as bone-ash, mixed with sufficient sulphuric 

 acid to convert most of the insoluble earthy phosphate of 

 lime into sulphate and soluble superphosphate of lime. 

 Sulphuric acid hi the phosphatic mixture just mentioned ; in 

 sulphates of potash, soda, and magnesia ; in sulphate of am- 

 monia, etc. 



Chlorine in muriate of ammonia. 

 Silica as artificial silicate of soda. 

 Other constituents were supplied as under: 

 Nitrogen as sulphate and muriate of ammonia; as nitrate of 



soda ; in farm-yard manure ; in rape-cake. 

 Non-nitrogenous organic matter, yielding by decomposition, car- 

 bonic acid, and other products in yard manure, in rape-cake. 

 The artificial manure or mixture for each plot was ground up, or 

 otherwise mixed, with a sufficient quantity of soil and turf-ashes 

 to make it up to a convenient measure for equal distribution over 

 the land. The mixtures so prepared were, with proper precautions, 

 sown broadcast by hand; as it has been found that the application 

 of an exact amount of manure, to a limited area of land, can be 

 best accomplished in that way. 



The same manures were used on the same plot cacli year. Any 

 exceptions to this rub arc mentioned in foot-notes. 



