100 



EXPERIMENT STATION RECORD. 



The following list contains the names of grasses whicli were richer in 

 protein when grown in the North: 



Protein in Southern and Northern grown grasses. 



Reiltoji (Anrustls vulgaris) ^ 



Broom grass {Andropogon scopariui) < 



Blue stem {A . provi7ieialiii) I 



Sweet vernal grass (A nthoxanthum odoratum) \ 



Erect brome grass (Bromus ereetus) < 



Cheat (-B. gecaUmis) s 



Sheep fescue {Fe.ttitca ovina) < 



Miinro grass ( Panicinn agrostoides) < 



Tall panic- (/'. virgatinn) < 



Timothy (Phleutn pratense) <. 



Wood meadow grass {Poa nemoralis) } 



Foxtail {Setaria glauca) \ 



Northern . . . 

 Southern - . . 

 Northern . . . 

 Southern . . , 

 Northern . . . 

 Southern . . 

 Northern . . 

 Southern . . 

 Northern . . 

 Southern . . 

 Northern . . 

 Southern . . 

 Northern . . 

 Southern . . 

 Northern . . 

 Southern .. 

 Northern . .' 

 Southern . . 

 Northern . . 

 Southern . . 

 Northern . . 

 Southern . . 

 Northern . . 

 Southern . . 



Number 



of 

 analyses. 



Protein 

 in dry 

 matter. 



ii 



1 



1 



1 : 



?! 

 2 j 

 1 



Jl 



1 ! 



50 ! 



1 



Per cent. 

 9.40 

 6.46 

 4.10 

 3.81 

 8.20 

 6.87 

 9.60 

 5.12 



11.19 

 8.18 

 8.00 

 5.18 



10.30 

 7.08 

 6.90 

 5.21 



10.50 

 3.81 

 8.00 

 6.51 

 8.70 

 8.60 



13.00 

 9.20 



Difler- 

 euce. 



Pe? 



•cent. 

 2.94 



0.29 



1.33 



1. 48 

 3.72 



\ - 



3.22 

 1.79 

 G. 69 

 1.49 

 0.10 

 3.80 



In the first list of grasses the fignresin every case represent the average 

 of 2 or more analj'ses. In the hitter list, if we eliminate all grasses of 

 which only 1 analysis either of Southern or of Northern grown plants is 

 recorded, we have left only 2 grasses, viz, redtop and sheep fescue. 

 Hence, of the grasses here compared, of which the average composition 

 may be regarded as in some degree fixed, Ave find that 6 are richer 

 when Southern grown and only 2 are richer when Northern grown. 

 Since the plants grown North and South were not sown and cut for 

 analysis at corresponding dates, and since the difference in jirotein 

 content of the dry matter may be due to differences in the maturity of 

 the plants, it may be of interest to consider the relative proportion of 

 fiber in the plants, assuming that a large amount of fiber is indicative 

 of an advanced stage of maturity, and that this stage is normally 

 accompanied by a low protein content. Of the 12 grasses having their 

 maximum protein content when grown in the North all except cheat grass 

 and wood meadow grass (both of which were analyzed only once) have 

 their minimum fiber content when grown there, and hence presumably 

 they were cut at an earlier stage of growth than the same plants when 

 grown in the South. In the case of the 6 grasses showing superiority 

 in protein in the South the fiber content was in five cases practically 

 identical in Northern and Southern grown samples, thus suggesting 

 similarity in the stage of development of the two sets of samples. This 

 superiority of Southern-grown grasses in i^rotein, unaccompanied by a 

 decrease in fiber, suggests that the variation in the composition of 

 grasses grown in different latitudes may not be entirely dependent on 

 difference in the maturity of the plants. 



