•5 JO Journal of Agricultural Research voi. xv, no. s 



EFFECT OF ADDED SALTS ON CONCENTRATION OF SOIL SOLUTION 



In order to get some definite conclusions as to the actual concentration 

 of the soil solution in these alkali soils under the conditions of the experi- 



DaO inpp- m- of dry soil 



400 1.000 2.00O J.000 f.OOO 



moUure UCJULJLJv1a_JUvJvJLJ^ 

 moisture \^S/^^zMlAzXlXlXJ^ 



j4« 

 moisture 



moisture 



^" CBCX[)©©gXX)CXX) 



moisture 



• = one plant mmmm = o-igm-0rymatttr 

 DojCOj in p.p.m of dry soil 



JOO 1.000 J.OOO S.OOO 7.000 10.000 



20% 



moisture 



Z17. 



. moisture 

 moisture 



o©ocxx)oa30oo 

 c^©axxxxDax) 



moisture Kiy'^JAiy<jAlA.y\.J^.J'\.yK^^ 



moisture '<_^A^5A,jXlA_yVA-A_A.>^^V_A_y 



• = one plant i i == o-ipm. ary matter 



HogSD^ in p.p. m- of dry soil 



JOO 1.000 J.000 5.000 1,000 10.000 



■moisture LJ^^JCJUUUCJOLJ^^ 



moisture w"^lA_/^l>^_y^iy^>^A.^^ 



moisture 



moisture 



moisture W^iiA^!AJ^._A.A.A_/^JvlA_A_y 



• ■= one plant mmmm s= o-iQ/n (fry matter 



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

 clay maintained at diflerent moisture contents and containing sodium chlorid, sodium carbonate, and 

 sodium sulphate added in various concentrations. 



ment, the freezing-point method described by Bouyoucos and McCool ^ was 

 used. The soils were dried and later made up to the moisture content 



1 Bouyoucos, G. J. and McCool, M. M. the freezing-point method as a new means of meas- 

 uring THE concentration of the soil solution directly in the soil. Mich. Agr. Exp. Sta. Tech. 

 Bui. 24, p. 592-631 2 fig. 1916. 



