Wheat Investigations. 27 



to note that line 2388 showing the highest bushel weight of 

 all Aroostook lines furnished a flour of very good quality, best 

 of all Preston lines. The Minnesota lines, with the exception 

 of durum, are well grouped about the standard weigbt. 



Chemical Characters of the Pure Lines, 

 protein analysis in i917. 



The protein content of the pure lines was first determined in 

 1917.* In computing the protein content from the nitrogen the 

 factor 5.7 was used. The results of the analysis of 99 pure lines 

 are given in Table 5. The lines are grouped within the varieties 

 from which they originated, and according to their nitrogen 

 rank. 



An inspection of Table 5 shows a relatively high average 

 percentage of protein for the different varieties. Certain lines 

 within each variety group possess a protein content which under 

 Aroostook conditions must be regarded as decidedly high. This 

 should not surprise one if it is recalled that the lines were selec- 

 ted for high nitrogen as indicated by their physical characteris- 

 tics. From Table 5 it will be noted that the Canada Red variety 

 shows the highest average protein content — 14.31 per cent — of 

 all Aroostook lines. This group is followed by the Preston, Blue- 

 stem, Red Fife, Unnamed and Marquis varieties in the order 

 named. The Minnesota lines, excluding the durum wheats which 

 proved to be least adapted to Aroostok conditions and should be 

 treated separately by themselves, show an average crude protein 

 content practically equal to that of Canada Red. The average 

 protein content of all Aroostook lines taken together is 13.81 

 per cent while the Minnesota lines with an average of 14.36 

 show a hardly significant difference of about 0.5 per cent. 



It will be of interest to compare the protein content of the 

 Minnesota lines originally grown in Minnesota with that of 

 their progeny grown one season in Aroostook. In Table 6 are 

 tabulated the data on the protein content of the original Minne- 

 sota grown seed and of the Aroostook grown progeny. 



*Credit is due to the Chemistry Department of this Station for the 

 chemical analyses of wheat of the pure lines in 1917 and 1918. 



