638 



EXPERIMENT STATION KECOKD. 



[Vol. 37 



Variation of the waier content of the leaves of com, Kafir com, mnd milo maize, 

 1914-1916, at Garden City, Kan*. 



The average rate of lncrea.se of dry matter for each square meter of leaf 

 for corn, Kafir corn, and milo maize during each two-hour period of the day 

 has been estimated as follows : 



Average rate of increase of dry matter per square meter of Icxif. 



The author summarize.^ his observations and conrUisIons as follows: 

 The amount of water in the leaves of milo maize was found to be lower at 

 all times of the day and nipht than that of corn or Kafir corn leaves at a 

 similar stage of development, while the nverape water content of these two was 

 practically the same. The water content of the loaves of corn, Kafir corn, and 

 milo maize averaged 118.5, 120, and 107 gm.. respectively, for each square meter 

 of leaf during the day (7 a. m. to 7 p. m.. Inclusive) and 127.9, 132.7, and 115.5 

 giu., respectively, for the night periods (7 p. m. to 7 a. m.. inclusive). The 

 average variation between the maximum and minimum water contents of the 

 leaves from 7 a. m. to 7 p. m. was 13.8, 8.4. and 7.8 gm. for each square meter 

 of leaf of com, Kafir corn, and milo maize, respectively, and the average range 

 between the maximum water content of the leaves during the night and the 

 minimum amount during the day, 23.8, 25.9, and 21.7 gm., respectively. 



Evaporation during the 22 days reached a maximum 18 times between 2 and 

 3 p. m. and 4 times between 3 and 5 p. m. Two-thirds of thp observations for 

 corn and milo maize and nine-tenths of tho.se for Kafir corn showed a minimum 

 water content of the leaves from two to four hours before maximum evapora- 



