Bui. 238, U. S. Dept. of Agriculture. 



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Fig. 1.— A Shallow-Plowed Beet Field. 





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Fig. 2.— A Deep-Plowed Beet Field. 



CONTIGUOUS SHALLOW-PLOWED AND DEEP-PLOWED FIELDS, SHOW- 

 ING THE EFFECT OF EACH METHOD ON WEEDS. 



Shallow plowing leaves the weed seeds near the surface, where they spring up before the beet 

 seeds, checking and choking the yoimtf beet seedlings. Deep plowing buries Hie wee,] seeds 

 and gives the beets an opportunity to get started before they come up. 



