LIMIT OF PHYSIOLOGICAL, WATER 55 



Average Physical Conditions. 



Air temperature 98 ° 



Relative humidity 47% 



Soil temperature 105 ° 



Light (maximum) 35% 



Phaseolus vulgaris. 



Selianthus annuus. 



Bicinus communis. 



These plants were subjected to more severe drought than 

 those first mentioned in this chapter. In each case the limit 

 of physiological water was noticeably increased and the 

 plants died in a per cent of soil water equal to or greater 

 than the soil contained at the first period of excessive wilting. 

 The limit at which they died was higher than the limit at 

 which they die when not revived at any time during the 

 period of drought. 



