324 



GRASSES OF IOWA. 



WATER FREE SUBSTANCE. 



Sample 1 . 

 Sample 2. 

 Sample 3. 

 Sample 4. 



37.01 

 42.50 

 41.82 

 41.65 



From these results we can draw the following conclusions: 

 The water content of the sample as received in the laboratory- 

 decreased from 79.22 per cent to 69.89 per cent as the growth 

 increased. For comparison of the other constituents the results 

 based on the dry matter will give more satisfactory results and 

 here we find that the fat is somewhat lower in the sample of 

 June 8th than in the other three. The amount of protein 

 present decreases as the plant grows older from 18.44 per cent 

 to 8.74 per cent. The same condition is present in the case of 

 the albuminoids. The crude fiber, however, increases from 

 26.75 per cent to 37.26 per cent while the nitrogen free extract 

 increases from 37.01 per cent to 42.50 per cent. 



As a matter of interest the following analysis of Phleum 

 jrratense are selected for comparison with the results obtained 

 from the Iowa samples: 



SAMPLE FROM. 



All analyses 68— (1) 



Cut in full bloom 



Cut soon after bloom 



Cut when nearly ripe 



Iowa (2): 



July 12, after bloom 



Wild from Idaho, cut June 20, 

 just before bloomingr 



&. 



5.90 

 6 00 

 5.70 

 5.00 



3.38 



3.30 



o ii 



45.00 

 41.90 

 44.60 

 43.70 



24.25 



11.85 



U. S. Dept. of Agrl. Handbook of Exp. Sta. Work. Bull. (5:388. 1893. 

 Bull, Iowa Agrl. Exp. Sta. 11 :449. 455. 



