Manuring and Rotations 91 
could be carried out with some other sod crop, such as 
clover or grass. In a rotation of this kind the use of 
manure is usually most effective if applied just previous 
to the beet crop. In plowing up alfalfa, it is usually bet- 
ter to plant the land to some crop such as corn or pota- 
toes for a year before planting beets because of the in- 
terfering action of the coarse alfalfa crowns. Clover and 
grass land may often be planted to sugar-beets at once, 
especially if fall-plowed. 
