ALKALI IN SOILS. 37 



Tabi-K 11. — ChcniicaJ r<niiit<isUioii of soils of Tozrr oasis. 



No. of 

 sam- 

 ple. 



Description of l(K-ality whei-i^ sample was 

 taken. 



Open t,'ronnfl, surroundfd by date sa-i"- 

 di'us, murh wliit(* salini^ chlort'scenco 

 on surfaco; growth of salt-l<iving weeds 



Ingai-den adjoining No. I, among young, 

 tnrifty Degk't Nooi- palms planted the 

 year liofore in a thin stand of alfalfa 



In land, refently broken up for reclama- 

 tion, of a neglected garden where 

 palms had suffered from lack of irri- 

 gation - 



In land still uncleared and covered with 

 a dense growth of weeds and gra.ss, in 

 same garden as No. 3 



In unirrigated land lying higher than 

 surrounding gardens; heavy efflore.s- 

 cence; scattered, stunted palms; growth 

 of salt-loving weinls 



Same boring as No. .5, lower depth 



In garden among young Deglet Noor 

 palms and a good stand of alfalfa; 

 wattn- at 36 inches 



In unirrigated land outside garden in 

 which No. 7 was taken, amid a growth 

 of salt-loving grass and rushes; water 

 at 24 inches 



Saline crust from neighborhood of main 

 drainage ditch; very little vegetation . 



Percentages of 

 water-soluble com- 

 ponents based on 

 di-y weight of soil. 



Depth of p„i„,,i„ tprt By chem- 



sample. ^Sn^^,^> ^"^1 f-jy 



tricalre- «i?"f.«ol"- 



si^nce ^-J^ - ^'" 



e" 81'"- part soil. 



oto;« 



to 36 



Oto I 



.90 

 ..54 



20 

 .30 



.58 

 .96 



.97 



6. .58 

 5.3:3 



4.82 

 5.37 



3.99 



5.78 



54.1 



Percent- 

 afje of cjil- 

 cium car- 

 bonate 

 based on 



dry 

 weiglit of 



soil by 

 acid diges- 

 tion. 



14.2!t 

 12.84 



10.24 

 16. :32 



13. 73 

 11.95 



5.3! 



The following table gives the composition of the totals of water- 

 soluble salts, of which the percentages, based on dry weight of soil, 

 are given in column 5 of the preceding table : 



T^JJLE 12. — Coiiii)ositioii of iratcr-soJiililr salts in soils of Tozrr oa.<ii.<t. 



92 



