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: 



Potdsh — as sulphate of potash. 

 Soda — as sulphate of soda. 

 Magnesia — as s^ulpliatP of mai^nosia. 

 Lime — as sulphate, phosphate, and superphosphate. 

 Pliosphoric acid — as bone-ash, mixed with suflicient sulphuric 

 acid to convert most of the insoluble earliiy pbnsphale of 

 lime into sulphate and soluble superphosphate of lime. 

 Sulphuric acid — in the phosi)hatic 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 org>tnic matter, yielding by decomposition, car- 

 bonic acid, and other products — in yard manure, in rapc-cakc. 

 The artificial manure or mixture for each i)lot was ground up, or 

 otherwise mixed, with a suflicient quantity of soil and turf-aslics 

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

 tlic laud. Tiie mixtures so jirepaied were, with proper ]T((aiiti()ns, 

 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 bo 

 best accomplished in that way. 



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

 exceptions to this rule are mentioned in foot-notes. 



