PLANTS OF THE CLOVER FAMILY. 69 



of Lake Superior, north of the 50th parallel, and 

 east of the Rocky Mountains. Among the second 

 are the areas that lie south of an irregular line that 

 would probably be confined within the states lying 

 between the 35th and 40th parallels. And among 

 the third are the areas that lie in the upper Missouri 

 basin and southward therefrom. But in each 

 instance there are exceptions to the limits thus put 

 upon the growth of medium red clover, for its suc- 

 cessful production depends even more upon altitude 

 than upon parallels of latitude and longitude. 



Place in the Rotation. — Medium red clover 

 may be given any place in the rotation. But it is 

 peculiarly fitting that it shall be sown after a crop 

 that has been cultivated with a view to cleaning the 

 soil. When grown for pasture, however, it is not 

 so necessary that it shall be sown on clean land as 

 when grown for other uses, since timely depastur- 

 ing will prevent nearly all forms of weed life from 

 ripening their seeds in the pasture. And it is good 

 practice to follow it with some kind of crop that 

 requires much nitrogen to grow it in good form, 

 since, as is now generally known, clover has much 

 power to take nitrogen from the air and place it in 

 the soil. The roots of the plants that immediately 

 follow the clover may readily appropriate it. The 

 small grains, corn and sorghum, may, with much 

 advantage, be made to follow clover. 



Soil. — Clay loam soils that lie upon a subsoil of 

 what may be termed mild clay are usually consid- 

 ered the best for the production of clover. But to 

 this there may be some exceptions. Stiff clay, with 

 a subsoil not too unyielding, will produce good crops 

 of clover when sufficient moisture is present, particu- 



