37° 



BOTANICAL GAZETTE 



[may 



xperiments 



* 





coefficient) were obtained and determined 



method 



confirm the statement 



Although incom- 



Fig. 10. — Chart showing relation of wilting coefficient and soil moisture of Leon 

 sand, and comparison with precipitation: AA, wilting coefficient; BB, range of soil 



aporation 



moisture from September to June; __, e _^« w wmmMJ , f(VW-1 . _ . 



station during same period; R, curve of average monthly rainfall (in inches); R J , 

 curve of rainfall during the period. 



the wettest soil, not actual swamp, in the region. The wilting 

 coefficient of soil taken from the first 3 inches of the surface is 

 approximately 5 . 9, while the average percentage of the soil mois- 

 ture present during the year is 1 2 . 74 (fig. 10). Only once (in April), 



