THE GROWTH AND NUTRITION OF PLANTS. 



123 



It will be seen that not only have the chemicals exceeded the 

 manure in the total of five years but also that the chemicals hold 

 out better, — a point always assumed to be otherwise. It is pro- 

 posed to continue this experiment. 



(8.) Chemicals Compared with Prepared Fertilizers. — In 

 a series of experiments covering three years, we have arrived at 

 the following conclusion : 



Three crops, — corn, oats, and hay, gave us a total value : 

 With no fertilizer^ ..... $70.07 



With Potash alone, 



" Phosphoric Acid alone, 



" " " and Potash, 



" " " " Nitrogen, 



" Chemical fertilizers (complete), 



" Prepared " . 



" Ashes, .... 



94.74 



73.66 



111.43 



56.99 

 108.56 



95.67 

 107.94 



In our Cooperative series in 1889 : 

 The best three combinations of chemicals, gave yields of corn 

 averaging, . . . . . . . $90.62 



Prepared fertilizer, ..... 63.58 



No fertilizer, 41.00 



