Nov. 4. I9I8 50^7 Factors Affecting the Toxicity of Alkali 301^ 



moisture content the lighter loams are more tolerant; but if enough 

 more water is added to make them equally wet the heavier soils are 

 more tolerant. 



noCI in p.p. m. of dry soil 

 too 1.000 Z.0 00 3.oo'o tfioo 



no 

 chaff 



chaff 5^^^^^ 



chaff ^ 



chaff 



chaff 



chaff ^^ir^^^Hr^ 



• = one plant — — = cifm-drYmotttr 



flOjCOj in p. p.m. of dry soil 



500 1.000 3,000 SPOO 7,000 



moo 



9 = one plant 



■■ e-iom dry matter 



Po^SO^. in p.p.m. of dry soil 



300 1,000 3.000 sjooo 7.000 moo 



no 

 chaff 



chaff ^vtf^.u'hu'/ 



jut. 

 chaff 



chaff ^^^P^^^^U^^l^^^ii!''""^'"^""^"*^ 



• «= one plant " = ojfm. dry motler 



Fig. 14.— Diagram showing the number of wheat plants up and the dry matter produced in loam with 

 diCercnt amounts of chaff, containing sodium chlorid, sodium carbonate, and sodium sulphate added 

 in various concentrations. Soils maintained at an equivalent moisture content. 



