232 THE FIRST BOOK OF FARMING 



One money crop which is necessarily an exhaus- 

 tive crop. 



One manurial crop which is a soil enricher. 



One feeding crop which diminishes fertility only 

 a little. 



One cleansing crop, a hoed or cultivated crop. 



CONDITIONS WHICH MODIFY THE ROTATION 



There are certain conditions which tend to modify 

 the rotation or to influence the farmer in his choice 

 of crops. They are as follows : 



First of all the climate will set a limit on the 

 number and varieties of crops from which a choice 

 can be made for a given locality. 



The kind of farming which he chooses to carry 

 on, whether stock raising, grain farming, truck 

 farming, or a combination of two or more of these, 

 or others. 



Kind of soil. Certain soils are best adapted to 

 particular crops. For example, heavy soils are best 

 suited to wheat, grass, clover, cabbages, etc. Light, 

 sandy soils to early truck, certain grades of to- 

 bacco, etc. 



The demand for crops and their market value. 



Facilities for getting crops to market, good or 

 bad country roads, railroads and water transporta- 

 tion. 



The state of the land with respect to weeds, in- 

 sect pests and plant diseases. 



