Field Truck Crops 259 



GENERAL CONSIDERATIONS 



The foregoing crops differ materially from one another in 

 many respects, though they are all heavy potash feeders. 

 They are considered here primarily as special crops pro- 

 duced upon general or dairy farms ; hence, it must be 

 remembered that there are numerous factors which in- 

 fluence the fertilization, chief among which are : the kind 

 of soil, the rotation and system of fertilization and the 

 length of growing season required by each. 



