64 CHEMICAL MANURES. 



The other fertilizers remaining the same, under this change the 

 expense for five years will be brought from $51.40 to $65.64, which 

 makes the annual expense, in round numbers, $15.10, instead of 

 $10.28. 



While with manure alone the yield of beets is with difficulty 

 raised to 23,111 pounds the acre, with the addition of the fertilizer 

 it is raised to 35,000 or 40,000 pounds at least. 



In the regions favorable to the culture of colza and the beet, as 

 the department of the Somme, for example, great advantage has 

 been derived by preceding the beet by colza, upon which all available 

 manures are concentrated ; under these new conditions the earth is 

 better prepared for the culture of the cereals which follow, and the 

 manure, being in a more advanced stage of decomposition, con- 

 tributes more effectively to the success of the beets. 



If the preceding rotation is changed in this way, the following is 

 the manner of dividing the added fertilizers : 



Rotation of Five Years, comprehending Colza, Beets, Wheat, Clover, 



Wheat. 

 First Year Colza. 



The acre. 

 Quantity. Price. 



Manure 44,444 Ibs. 



Sulphate of ammonia 266 " $11.40 



Second Year Beets. 

 Ashes from the burning of the straw and 



husks of the colza. 



Complete fertilizer, condensed, No. 2, 711 Ibs. 

 Composition : 



Acid phosphate of lime 266 Ibs. $ 4.03 



Nitrate of potash 177 " 10.47 



Nitrate of soda 133 " 4.43 



Sulphate of lime 133 " .14 



Cost $19.07 



Third Year Wheat. 

 Sulphate of ammonia 177 Ibs. $7.60 



Fourth 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 



Cost $16.54 



Fifth Year Wheat. 



Sulphate of ammonia 177 Ibs. $7.60 



Cost for five years - $62.21 



The cost being this time $62.21 for the five years, the anual expense 

 will be raised to $12.44. The second wheat succeeding the clover 



