Nov. 4. i9i8 Soil Factors Affecting the Toxicity of Alkali 297 



shown in figures 5, 6, and 7. These graphs show but little difference 

 in the tolerance of sand and clay, but the presence of loam greatly 

 increases tolerance for alkali, 



Do^l In p. p. mof dry .soil 



^00 IP 00 2,000 jooo 4.000 



no ^ ~ 

 manure 



manure 



J% 



manure 



10% 

 manure 



is% 

 manure 



@^5@©@©©OCXX) 



£0% 



manure v^v 



» ==one fiknf — i^^ ='0.i^mdryiv<ltfer 



Hoi CO3 in p.p. m. ofdryioil 

 500 ifloo J.ooo 5.000 1000 10.000 



. no 

 manure 



manure 



5% 

 manure 



10% 

 manure V^'«> 



is% 

 rnanure 



zo% 

 manure 



@©ccooooocoo 



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* ^=ortc plant ^^^^» =o.i^mdrymottcr 



DoiSQ, in p. p.m. of dry soil 



500 1.000 3.000 5.000 7,000 10,000 



no 

 manure 



manure 



5 7. 



manure 



10% 

 manure 



manure 



onure ^J^Ji^yCXJCJUUCJCjL^ 



/r^ ©soooooooooo 



Z07. 



manure 



• = ont Dioni ■■■"" = 0.1 gm. dry matfcr 



Fig. 10.— Diagram showing the number of wheat plants up and the dry matter produced in 21 days m 

 sand with different amounts of manure containing sodium chlorid, sodium carbonate, and sodiimi 

 sulphate ac'ded in various concentrations. Moisture content maintained at 20 per cent throughout. 



