ROTATION OF CROPS 245 



rotations are more generally followed in European 

 countries. The length of the rotation can only be de- 

 termined by the conditions existing in different local- 

 ities. As a general rule long-course rotations should 

 be attempted only after a careful study of all the 

 conditions relating to the system of farming that it is 

 desired to follow. For northern latitudes a rotation 

 of four or fiye years giyes excellent results. In some 

 localities three-course rotations are the most desirable. 

 A rotation that is suitable for one locality or kind 

 of farming may be unsuited for other localities or con- 

 ditions. Because of variations in soil, climate, and 

 rainfall, no definite standard rotation can be pro- 

 posed that will be suitable for all conditions. 



320. Example of Rotation. — In dealing with the 

 subject of rotations it is best to take actual problems 

 as they present themselves and plan rotations that will 

 best meet all conditions. For example, a farm of 

 160 acres is to be rotated with the main object of pro- 

 ducing fodder for live stock, and a small amount of 

 grain for sale. The following rotation has been pro- 

 posed to meet such conditions. 82 



