138 



The Sugar-Beet in America 



Per&tnt Jucfose 



Pzrctnt Purity 



FIG. 16. Effect of weekly irrigations on percentage of sucrose and 

 purity. Utah. 



have given rather conflicting results. Observations by 

 Schneidewind * and others in Germany in the period from 

 1896 to 1906 showed that, although the yields are smaller, 

 root crops are richer in carbohydrates and protein in dry 

 years than in wet ones ; hence the net influence of weather 

 is not so great as it is ordinarily thought to be. High- 

 bred, resistant strains showed less variation in dry and 

 wet years than did common varieties. 



1 Landw. Jahrb. 36 (1917), No. 4, pp. 474-581. 



