THE BEET SUGAR INDUSTRY. 



79 



portions and kinds of food which this plan involves, must soon impair results. Three 

 ciops in succession in Nebraska's rich soil showed marked deterioration in quality. 

 Constant cropping with beets also tends to perpetuate or multiply any pests (insect 

 or fungus) of this plant. It is true that beets have been grown continuously on the 

 same land in California for a dozen years, without apparent injury 10 yield or qual- 



TYPES OF SUBSOIL PLOWS 



To follow in the furrow after tbe first plowing by ordinary plows. 



GANG PLOW WITH SUBSOTLING ATTACHMENT. 



ity, but this does not gainsay the axiom above laid down. Thus far, best tonnage 

 and quality have been secured in California from beets grown on the land every third 

 year, and in Nebraska every fourth year. 



X'\v land should be subdued, as stated on Page 78, before being grown to beets. 

 This crop should always follow corn or small grain, because these being harvested" 

 early, the land is free for the fall plowing that is absolutely essential to best results 

 with the beet. In Nebraska corn does not seem to do well after beets, neither 



