266 



Journal of Agricultural Research 



Vol. VI, No. 7 



The five plots diflfered rather widely in their rate of growth, as is shown 

 in figure 4. The Utah plants were 48 days old before attaining the 

 height required for first sample. During this time they looked yellow 

 and unthrifty, owing to excess moisture and cool soil. Subsequently 



Fig. 3. — Curves showing the precipitation, temperature, and humidity relations at the various experi- 

 ment stations during the growing season of 1915. 



the plots grew nearly as fast as those at the other stations and gave a 

 higher yield of dry cane at the end of the season than did the South 

 Dakota plots, although the latter grew much taller. The Kansas plots 

 grew the most rapidly. 



