Bui. 721, U. S. Dept. of Agriculture. 
Plate 
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(MW^ 
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Fiq. 1.— Blocking and Thinning Sugar Beets, an Operation That Must Be Per- 
formed by Hand as Soon as the Beets are Large Enough. 
Fig. 2.— Flooding a Field of Sugar Beets, a Method of Irrigation Which 
Destroys the Stand of Beets and Injures the Soil. 
