May 15, 1916 



Hydrocyanic-acid Content of Sorghum 



265 



DISCUSSION OF RESULTS 



The season of 191 5 furnished some excellent extremes in weather 

 conditions for this experiment. Figure 2 shows that, as regards tem- 

 perature, the two more southern States, Kansas and Utah, form one 

 pair, and South Dakota and Minnesota another, with approximately 

 10 degrees difference between them during the growing season. Of the 

 two warmer stations, Utah had a low rainfall, and irrigation was resorted 



-20 46 "TO 80 100" 



AGE OF PLANTS IK DAYS 



Fig. 2.— Curves showing the rate of growth of the sorghum on the various plots. 



to; while Kansas had a very abundant rainfall, resulting even in flood 

 conditions during May, June, and July. The two more northern sta- 

 tions had about the same rainfall for the first three months of the experi- 

 ment, but during the period when the samples were taken the rainfall 

 of South Dakota dropped below that of Minnesota. This was par- 

 ticularly the case during August. The 191 5 rainfall of South Dakota 

 was above normal, and as a result the plot on irrigation ground was 

 irrigated only once. 



