3i8 



Journal of Agricultural Research 



Vol. VI. No. 9 



far as could be seen, they were free from sand particles. The roots were 

 then dried in a hot-air oven at 105° C. and their dry weight obtained. 



DETERMINATION OF THE LEAF AREA 



For obtaining the leaf and sheath areas five representative plants of 

 the com, kafir, and milo, respectively, were selected at the desired stage 

 of growth. Their leaves and sheaths were cut into convenient pieces, 

 and the outlines of these portions were carefully traced with a hard lead 

 pencil on ordinary unruled paper. The outlines thus obtained were 

 traced with a polar planimeter and the inclosed area calculated. In 

 dealing with that portion of the leaf which was not yet fully unfolded, 

 care was taken that the measurements included only that surface of the 

 unfolding leaf that was exposed to the air. 



GENERAL DISCUSSION OF EXPERIMENTAL DATA 



EXTENT OF THE ROOT SYSTEMS 



The root systems of corn, kafir, and milo growing in the field were 

 isolated at four stages of growth in 191 4 and at three stages in 191 5. 

 A summary of the general extent of the root systems of these plants is 

 given in Table IV. 



Table IV. — General summary of the root systetns isolated during the sutnmers of IQI4 

 and jgi5 at Garden City, Kans. 



1914. 

 June 24 



July 17 

 Aug. I 



Aug. 25 



1915- 

 July 10 



Sept. 3 



Crop. 



Com, Pride of Saline 



Kafir. Blackhull .... 



Milo, Dwarf 



Com, Pride of Saline 



Kafir, Blackhull .... 



Milo, Dwarf 



Corn, Pride of Saline 

 Kafir, Blackhull .... 



Milo, Dwarf 



Corn, Pride of Saline 



Kafir, Blackhull 



Milo, Dwarf 



Com, Pride of Saline 



Kafir, Blackhull .... 



Milo, Dwarf 



Corn, Pride of Saline 

 Kafir, Blackhull . . . . 



Milo, Dwarf 



Corn, Pride of Saline 

 Kafir, Blackhull . . . . 

 Milo, Dwarf 



Height 



of 

 plants. 



Ft. in. 

 I 6 



3 6 

 2 6 



3 6 



Greatest 

 depth of 

 root pen- 

 etration. 



I 3 



1 6 



2 o 

 4 6 

 4 6 



4 6 



6 o 



6 o 



6 o 



Greatest 

 lateral 



extent of 

 roots. 



Ft. in. 



3 o 

 3 o 

 3 6 



3 10 

 3 6 



3 8 



3 8 



Greatest 



length of 



a single 



root. 



Ft. tn. 

 3 3 



3 8 



4 6 



General remarks. 



4 fully unfolded and 4 par- 

 tially unfolded leaves. 

 Do. 

 Do. 



8 fully and 6 partially un- 

 folded leaves. 



6 fully and 4 partially un- 

 folded leaves. 



"Rooting." 



"Shooting." 



Heading. 



Seed in milk stage. 



End of vegetative growth, 

 grains glazed. 



Seed in milk. 



Seed fully ripe. 



4 fully and 4 partially un- 

 folded leaves. 

 Do. 

 Do. 



Tassel peeping. 



7 fully unfolded and 5 par- 

 tially unfolded leaves. 



Blooming. 



Early milk stage. 



Blooming. 



Seed in milk stage. 



