Oct. 23, 1916 Daily Transpiration during Normal Growth Period 
203 
Two sets of Kubanka wheat were included in the 1915 measurements, 
which showed the same water requirement (405 ±6 and 406 ±3). The 
second set (pots 109 to 114) produced a heavier crop and was three days 
later in ripening, which accounts for the rise in the graph at the end of 
Fig. 18.—Graphs of the daily ratios of the transpiration of the different crops grown in 1915 plotted loga¬ 
rithmically. H signifies heading; D , lower leaves dying; S, that the plants were forming shoots; F, 
flowering; and C, the cutting of the crop, which was followed by a new growth from the established 
root system. 
the season. The rise of the ratio graph is even more marked in Wash¬ 
ington Bluestem and Preston, owing to the fact that they ripened five 
days later than Kubanka. Turkestan showed a relatively greater 
transpiration than Kubanka early in the season, while Marquis is nearly 
identical with Kubanka throughout. 
