CROP ROTATIONS 



207 



to sweet clover, the sweet clover to be pastured in fall 

 and spring and then plowed under in June. They 

 plan to reserve as much sweet clover for hay and 

 pasture as may be necessary. Some combination of 

 crops including sweet clover offers much promise for 

 the whole prairie area. If a strain of this crop, hardy 

 enough to live through our winters after being sown 

 with a nurse crop, can be developed, a very promising 

 rotation for much of the prairie area will be (1) fallow 

 or hoed crop, (2) grain, (3) grain, (seeded with sweet 

 clover or a grass mixture), and (4) sweet clover. Such 

 a rotation might be shortened up to three years if 

 thought advisable by omitting one of the grain crops. 

 (See "Crop Rotations" in "Dry Farming Practices in 

 South Dakota", chapter xvi). 



164. An Adjustable Rotation that may be made to 

 meet almost every condition of climate and soil is as 

 follows : 



165. Crop Rotations for Special Conditions. A crop 

 rotation planned to control annual weeds should have a 

 grass crop. One to control soil drifting should have a 

 grass crop or a crop such as winter rye or sweet clover 

 that occupies the land when blowing ordinarily occurs. 

 A rotation in drv areas should include either a fallow or 



