CHEMICAL MANURES. 47 



I pass to a more complex succession, for it embraces a period of five 

 years, and comprehends Irish potatoes, wheat, clover, colza and wheat 

 Here are the fertilizers to be employed in this case : 



First Year Irish Potatoes. 

 Complete fertilizer No. 3, 887 Ibs. 



Composition : Quantity h aCrC Price. 



Acid phosphate of lime 355 Ibs. $ 5.40 



Nitrate of potash 266 " 15.70 



Sulphate of lime 266 " .50 



Expense $21.60 



Second Year Wheat. 



Sulphate of ammonia 266 Ibs. $11.40 



Third Year Clover. 

 Incomplete fertilizer No. 2, 887 Ibs. 

 Composition: 



Acid phosphate of lime 355 Ibs. $ 5.40 



Nitrate of potash 175 " 10.47 



Sulphate of lime 355 " .67 



Expense $16.54 



Fourth Year Colza. 



Sulphate of ammonia 355 Ibs. $15.27 



Fifth Year Wheat. 



Sulphate of ammonia 266 Ibs. $11.40 



Ashes of the straw and husks of the colza.. " 



Total expense $7611 



Annual expense 15.22 



To show how necessary to regulate the quantity of manure to the 

 nature of the plant, I will show the results of three experiments made 

 by M. Cavallier on the beet, witlr'the progressive quantities of sul- 

 phate of ammonia, the manner of passing from 71 pounds of azote to 

 106 pounds the acre, the proportion of the other terms not being 

 changed: 



Roots the acre. 



Without azote 32,741 Ibs. 



With 355 pounds sulph. ammonia 32,740 " 



With 444 " " 42,064 " 



With 578 53,012 " 



You will remark, gentlemen, the correspondence between the in- 

 crease of the progressive return and the corresponding increase of the 

 azotic matter. What is the financial result ? 



The fertilizer without azotic matter, reduced to minerals alone 

 that is to say, to phosphate of lime, potash and lime produced 

 32,740 pounds of roots the acre. Now, if we take this return as a 

 point of departure, we find the excess of harvest, determined by the 

 use of sulphate of ammonia, increases in proportion to the amount 

 of ammonia employed. 



