EXAMPLES OF DKOUGHT RESISTANCE. 



21 



/ 



30 



20 



10 



S FAX 



OLIVE ORCHARD 



OLIVE ORCHARD 20 

 MILES F ROM SFAX 



■ ■ I I 



S PAX 



OLIVE ORCHARD 



xll 



1 



f 



> n: 



^ 'o ^: «o ^. s , 



k- U ^ i< S (0 ^ 



?^- 



ID "o 5" «d ;^ 



«) <o" ^. h i^. 





Uj 



v 



rO/2 / INCHES DE£P 



y \ 



^*.- ^ ^ k ^ <oji/ A- t> ^" V: S <o ^ 



/2 INCHES DEEP 



/ <Z 



z/ 



/3 TO Z^ /NCNES OE£P 



50 



^0 



30 



20 



I 



BOGART OLIVE GROVE 



CASA GRANDE ARIZONA 



nm 



> \ 







^ "Q. < . 

 •< ^ i^ (0 



\j 



O TO 6 /A/Cf^ES DEEP 



tTntpr 



/ ^k- ^ ^ k ; ^ ^- <o o. 



Ml 



/ 



to" "o 

 .k C5 



"9 (o I?: 



^ k ^- 



J 



i^ 



o. 



y 



6 TO /2 WCf^ES OEEP 



/2 TO /S //I/C//EJ- OEEP 



60 



5 



^0 



30 



20 



10 



POPE OLIVE GROVE 



PALM SPRINGS CALIFORNIA 



zt 



It 



U 



ill 



tn 



\ to 



\ 





k- 



I 



^ ^ 



"\^ 



/ 



to- H !3' 

 \k ^ ^ 



b- 1^: s: 

 k-Jjo O 

 •\y 



Ml 



to- Id; 'q lo- {^^ . 



/ \ 



to ^6 *^ ^- 



M^. Cj ^ k- ^ «oO 



A/- 



y 



O TO S /NCHES 0££P S TO /Z /A/CHES OEEP /Z TO /S /NC^ES DEEP 



Fig. 5.— Diagram showing the relative percentages of fine gravel, coarse sand, medium sand, fine sand, 

 very fine sand, silt, and clay in dry-land olive plantations in northern Africa (Sfax) and in Arizona 

 and southern California. 

 192 



