184 MAINE AGRICULTURAL EXPERIMENT STATION. I9I4. 



The mean yield of straw of these varieties is displayed graphi- 

 cally in Fig. 60. 



■ mPOBTED SCQTCH 

 KHERSON 



VICTOR 



PRESIDi NT 

 SILVER h'INE 



:' EH 4 TOR 



I INCOLN 



BANNER 

 IRISH VICTOR 

 Pf^OSPERiTY 

 REGENERATED SWtO/SH SELECT 



21-00 



2600 2700 



POUNDS PER ACRE 



Fig 60. Showing the average yield of straiv for the four years 1910 

 to 1913 inclusive. 



From this figure it is seen that the Lincoln variety produced 

 the largest amount of straw. The Imported Scotch and the 

 Kherson produced the smallest amounts. Curiously enough the 

 Victor which grows very tall produced a comparatively small 

 amount of straw. Further this variety shows a very small 

 amount of variation in respect to straw weight. Its coefficient 

 of variation is 3.78 which is practically the same as its coefficient 

 for yield of grain (Table 8). 



The amount of variation in the yield of straw for the four 

 years varies rather widely in the different varieties. The aver- 

 age coefficient of variation for all eleven varieties is 9.94 per- 

 cent. Comparing with table 3 it is seen that these varieties are 

 slightly less variable in respect to yield of straw than for yield 

 of grain. The difference between the averages of the two sets of 

 coefficients is 1.34 percent. This difference is subject to a rather 

 large probable error and probably is of little significance. 



The Prosperity and Victor show the smallest coefficients of 

 variation for straw weight. The Senator comes next with a 

 coefficient of 6.91 percent. The Lincoln and Imported Scotch 

 have coefficients of 8.81 and 8.96 percent respectively. The Sil- 

 ver Mine and Regenerated Swedish Select proved to be the most 

 variable. 



