34 



Journal of Agricultural Research 



Vol. X, No. I 



Table IV. — Summary of the variation of the water content of the leaves of corn, kafir, and 

 milo during the years 1914, 1915, and 1916, at Garden City, Kans. 



a Loss. 6 Gain. 



VARIATION OF THE WATER IN THE LEAVES 

 I. WATER PER SQUARE METER OF LEAF 



The average water content per square meter of leaf for the day and 

 night periods was 123.2 gm. for corn, 126.3 g^^- ^or kafir, and 111.4 gm. 

 for milo. The amount of water in the leaves of milo was found to be 

 strikingly lower than that of either corn or kafir leaves at all times of 

 the day and night. The amount of water in the leaves of kafir for all 

 the periods averaged slightly higher than that of corn. In some experi- 

 ments the corn leaves showed a greater amount of water than the kafir, 

 while in other experiments the kafir leaves had the higher amount. The 

 leaves of kafir that were used in one experiment in 1914, and in two 

 experiments in 191 6, were, however, a few weeks younger than the com 

 leaves and consequently had more water per unit of area, so that, on the 

 whole, there appears to be little, if any, difference in the average water 

 content of the leaves of corn and Blackhull kafir at the same stage of 

 development. 



The water content of the leaves of corn, kafir, and milo averaged 1 18.5, 

 120.0, and 107.0 gm. per square meter of leaf, respectively, for the day 

 periods, and, taken in the same order, 127.9, and 132.7, and 11 5.5 gm. 

 for the night periods. This made an average difference between the day 



