EOTATION OF CROPS 53 



have a royal flush if you have gone against the 

 advice of either. 



There are so many factors entering into the 

 planning of any place that it requires the keen- 

 est perception to balance them properly. Dr. 

 Warren, one of the leading authorities on farm 

 management in the country, presents the case 

 for rotation thus : 



" There are many reasons why crop rotation 

 is a good thing. The final factor that forces 

 farmers to change crops is usually either weeds, 

 insects, or diseases. Crop rotation (1) helps to 

 control these enemies; (2) may provide for 

 keeping up the humus supply of the soil; (3) 

 may provide for the growth of grass or leg- 

 umes on each field; (4) often saves labor; (5) 

 may keep the land occupied with crops a 

 greater part of the time; (6) allows for the 

 alternation of deep and shallow-rooted crops; 

 (7) may provide for a balanced removal of 

 plant food; (8) may control toxic substances; 

 (9) systematizes farming, ' ' 



These are self-explanatory to even laymen; 

 save, possibly, number eight. It is believed that 



