212 THE SUGAR BEET, 



The reasons for this have been before explained. The 

 tri-annnal system existed when fallow land was advo- 

 cated, but has now been abandoned, and the most popu- 

 lar is the quadr-annual, which has many advantages. 

 The land receives a sufficient variety of plants to 

 produce a most excellent effect. The number of 

 acres of land under cultivation varies with the system 

 of rotation, and the complications resulting increase 

 in the same proportion. It would be of little interest 

 to give all the combinations that have been adopted in 

 Europe, but a few we consider important. The follow- 

 ing is adopted in the northern part of France : — 



. . . Wheat 



. Beets 



.... Oats 



. Clover 



o 



Wheat 

 Grass 



Flax, colza 

 Beets 



Or, when large quantities of land are at one's disposal, 

 a five-year system can be and is adopted : — 



The wheat in this case being the object of rotation. 

 Then again on some farms we have visited tobacco 



