CHEMICAL MANURES. 63 



tilizers, and concentrate upon each plant those terms of the complete 

 fertilizer which fill for it the office of dominants. For the rotation 

 now occupying us I propose to divide the additional fertilizer thus : 



Rotation of Five Years, comprehending Irish Potatoes, Wheat, Clover, 



Wheat, Oats. 



First Year Irish Potatoes. 

 Manure, 44,444 Ibs. 

 Incomplete fertilizer No. 2, 444 Ibs. 



Composition : Quantity. ' Price. 



Acid phosphate of lime 177 Ibs. $2.70 



Nitrate of potash 88 " 5.23 



Sulphate of lime 177 " .33 



Cost $8.26 



Second Year Wheat. 

 Sulphate of ammonia 177 Ibs. $7.60 



Third Year Clover. 

 Incomplete fertilizer No. 2, 887 Ibs. 

 Composition : 



Acid phosphate of lime 355 Ibs. $ 5.40 



Nitrate of potash 88 " 10.47 



Sulphate of lime 355 " .67 



Cost $16.54 



Fourth Year Wheat. 

 Sulphate of ammonia 177 Ibs. $7.60 



Fifth Year Oats. 



Sulphate of ammonia 266 Ibs. $11.40 



Cost for five years $51.40 



The cost for five years being $51.40, the annual cost is $10.28. 

 With manure alone the Irish potato yields 10,666 pounds of tubers 

 the. acre; wheat, 25 bushels; oats, 43 bushels; and clover, 4400 

 pounds of forage. With the addition of the chemical fertilizer, as 

 just shown, the yield of Irish potatoes is raised to 17,777 pounds at 

 least, that of the wheat to 43 bushels, that of the oats to 65 or 72 

 bushels, and the clover does not yield less than 7111 pounds of dry 

 forage. 



If the Irish potato is to be replaced by the beet, the following fer- 

 tilizer must be substituted for the fertilizer of the first year : 



Complete fertilizer No. 2, 551 Ibs. 



Composition: Quantity. 11 '' splice. 



Acid phosphate of lime 177 Ibs. $2.70 



Nitrate of potash 88 " 5.23 



Nitrate of soda 133 " 4.43 



Sulphate of lime 133 " .14 



Cost... . $12.50 



