328 



Journal of Agricultural Research 



Voi. VI, No. 9 



A^/lO 



these plants taken in the same order amounted to 1 16, "jj, and 63 sq. cm. 

 It is seen at this stage that the leaf area of com was 1.7 times that of 

 Dwarf milo and i .64 times that of the Blackhull kafir. 



Stage II. — The com plants at this time had a height of 2^ feet and 

 possessed six fully and six partially unfolded leaves. The Blackhull 

 kafir measured i^feet in height and showed six fully and four partially 

 unfolded leaves, while the Dwarf milo stood 2 feet high and had six 



fully and three par- 

 tially unfolded leaves. 

 The plants reached 

 this condition six 

 weeks from the date 

 of planting (PI. XUII, 

 fig. 2). At this time 

 the leaf area of the 

 com had increased to 

 5,424 sq. cm., while 

 that of the Blackhull 

 kafir and Dwarf milo 

 measured 2,635 and 

 2,532 sq. cm., respec- 



CO/PA/ 





^77^ GET /. 



<9^/Si(p./M 



B63S C/772\ 



M/LO 



PS32 C/?!^ 



STy^G^ 2. 



COf?/V 





t573 SQ./M 

 S63/ Cm^ 



A^/LO 



33 OS cm^ 



sST^^GjETsS. 



/^OS SQ./AC 

 •3092 cm^ 



SS/ SQ. /M 

 S74i9 cm^ 



60SSQ./M 

 3902cm^ 



tively, the leaf area 

 of the corn having in- 

 creased to twice that 

 of the Dwarf milo or 

 Blackhull kafir. The 

 leaf area of the two 

 sorghums increased 

 at the same rate up 

 to this stage. The 

 sheaths of all three 

 plants showed an area 

 approximately three 

 times larger than they 

 did when examined in 

 the first stage. 



Stage III.— The 

 plants at this period were 8 weeks old. The com stood 4 feet high 

 and had nine fully and five partially unfolded leaves. Blackhull kafir 

 and Dwarf milo had each reached a height of 2^ feet. The former 

 had seven fully and three partially unfolded leaves, while the latter 

 was in the "booting stage" and possessed nine fully grown leaves (Pi. 

 XLIV, fig. i). The Dwarf milo at this stage had reached its full leaf 

 development and showed a leaf area of 3,902 sq. cm. The leaf area of 

 the com plant was 2.2 times this, or 8,600 sq. cm. The leaf area of 



Fig. 2.— Comparison of the leaf areas of Pride of Saline corn, Black- 

 hull kafir, and Dwarf milo at four stages of the growth of these 

 plants during the season of 1914. 



