[shutt] 



'ALKALI" CONTENT OF SOILS 



239 



It has generally been held that this grass is strongly resistant to 

 alkali but the evidence to date does not confirm that view. 



Native Prairie Grass — Distressed Growth 



Group No. Na2S04 Na.COs 



1605 A .432 



B 1.001 



Native Prairie Grass is, very probably, rather more resistant 

 than wheat, the toxic limit of sodium sulphate is not reached until 

 there is 1.0 per cent, in the root feeding zone. 



Oats — Distressed Growth 



NaaCOs 



212 



149 



243 



100 



The limit of sodium sulphate for oats appears to^be about .9 — 1.0 

 per cent; of sodium carbonate approximately .2 per*cent. 



Group No. 

 1627 A 

 B 



Onions — Distressed Growth 

 Na2S04 



NaaCOa 

 .224 

 .120 



The limit of sodium carbonate for onions is evidently about .2 

 per cent. 



Timothy — Distressed Growth 



Group No. Na2S04 Na^COs 



1695 A .753 



B .215 .... 



Apparently Timothy is slightly less resistant than wheat, the 

 limit of tolerance toward sodium sulphate is about .7 per cent, in 

 the root feeding zone. 



Vetch and Rye — -Distressed Growth 



Group No. Na2S04 NagCOs 



1700 A .208 .253 



B .073 .127 



