CHEMICAL MANURES. 79 



Second Year. Wheat. 



The aero. 

 Quantity. Price. 



Sulphate of ammonia 



Ashes of the straw and husks of the colza, 266 Ibs. $11.40 



Total expense $40.03 



Expense the year $19.46 



Burn the straw and husks of the colza on the field, and sow the 

 ashes over the surface of the soil after the first working ; then spread 

 the sulphate of ammonia when the earth has been worked a second 

 time. Instead of burning the straw and husks of the colza, you may 

 rot them according to the directions given in the Sixth Lecture. 

 The use of the straw and husks of the colza is then confounded with 

 that of the manure. 



Rotations of Four Years, comprising Irish Potatoes, Wheat, Clover, 



Wheat. 



First Year Irish Potatoes. 

 Complete fertilizer No. 3, 887 Ibs. 

 Composition : 



Acid phosphate of lime 355 Ibs. $5.40 



Nitrate of potash 266 " 15.70 



Sulphate of lime..... 266 " .50 



Total 887 Ibs. Cost... $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 177 " 10.47 



Sulphate of lime 355 " .67 



Total.... 887 Ibs. Cost... $16.54 



Fourth Year Wheat. 



Sulphate of ammonia 266 Ibs. $11.40 



Total expense $62.04 



Annual expense $15.20 



Rotations of Four Years, including Beets, Wheat, Clover, Wheat. 



First Year Beets. 



Complete fertilizer No. 2, double, 1155 Ibs. 

 Composition : 



Acid phosphate of lime 355 Ibs. $5.40 



Nitrate of potash 177 " 10.47 



Nitrate of soda 355 " 11.82 



Sulphate of lime 268 " .50 



Total... . 1155 Ibs. Cost... $28.19 



