124 MASSACHUSETTS HORTICULTURAL SOCIETY. 



If we ask for an explanation of the superiority of Chemicala^ 

 over Prepared or Commercial goods, it must be answered by 

 comparing the composition, — that is, the relative amount of nitro- 

 gen, phosphoric acid, and potash. The average of the prepared 

 fertilizers sold in New Hampshire, in 1889, was as given in the 

 following table, and beside it is given the average of the three 

 best combinations of chemicals in the cooperative series, as well 

 as the average of the best six combinations used on the Agricul- 

 tural College Farm. 



Other results are equally pronounced, and we must conclude 

 that our soils require more potash than is provided in the commer- 

 cial goods. To get this, farmers are recommended to bu}' chemi- 

 cals, and mix according to the follow formulae : 



I. 



Chemicals for Corn and Wheat. 

 Dissolved bone-black, 325 



Muriate of potash, 100- 



Sulphate of ammonia, 75 



500 

 II. 



Corn (same as plot 26 in Experiments). 



Dissolved bone-black, 182" 



Muriate of potash, 252' 



Sulphate of ammonia, 66 



500 

 III. 



Corn (average of four best yields in plots). 



, Dissolved bone-black, 175 



Muriate of Potash, 260 



Sulphate of ammonia, 75- 



500/ 



