CROP ROTATION 



75 



when stored. If wheat is found to be in the sweat at the 

 time of threshing it is well to store in large shallow bins 

 where it can be shoveled 

 over at frequent inter- 

 vals until dry. In the 

 wheat-growing regions 

 there are many elevators 

 where grain is taken im- 

 mediately after thresh- 

 ing and there cleaned, 

 sweated, and stored for 

 future shipment. Much 

 of the wheat is manu- 

 factured into flour at 

 the great milling centers 

 and sent from there to 

 different parts of the 

 world. 



Rotation. Wheat should be grown in a rotation with a 

 leguminous and a cultivated crop. Good rotations for 

 wheat are the following : 



THREE YEAR ROTATION 



FIRST YEAR. Corn, potatoes, or root crops on young sod. 



SECOND YEAR. Wheat, seeded down with clover. 



THIRD YEAR. Clover, first cutting used for hay ; second, turned under. 



FOUR YEAR ROTATION 



FIRST YEAR. Corn, peas, potatoes, or root crops on young sod. 

 SECOND YEAR. Wheat, seeded down with clover and timothy. 

 THIRD YEAR. Clover, two cuttings of clover, pasture in the fall. 

 FOURTH YEAR. Mixed hay, fall plowed for corn. 



FIVE YEAR ROTATION 



The same as the four except the field is not plowed at the close of the 

 fourth year of the rotation but is run the fifth as pasture. The five year 

 rotation is common where a large amount of stock is kept on the place and 

 much pasturage is necessary. 



Fig. 40. A grain elevator. 



