58 THE ROYAL SOCIETY OF CANADA 



(native or cultivated), and evidently free from all save negligible 

 amounts of alkali; (2) from land upon which there was a poor or 

 meagre growth, indicating that the alkali present approached the 

 limits of tolerance for tlie crop in question and (3) from land upon 

 which there was no growth, due to excess of alkali. From each of 

 these selected areas a series of three groups of soil samples has been 

 taken within a comparatively short distance of one another; these 

 would necessarily represent soil essentially free from alkali, soil in 

 which the alkali content was such as to markedly affect growth, and 

 soil so seriously impregnated as to inhibit all growth. Each group 

 consists of four samples: A— 0'0-0'-5, B— 0'-5-l'-5, C— 1'-5-3'-0 

 and D— 3'- 0-5'- 0. 



The previous papers submitted in this investigation record the 

 results of the examination of nine series of soil groups, the crops 

 involved being: Western Rye Grass, Native Prairie Grass, Oats, 

 Wheat and Onions. The present report deals with soils sown to 

 Wheat, Oats, Timothy, Vetch and Rye. While certain of the areas 

 previously examined were from "dry" land, the four now reported on 

 were all under irrigation. 



Wheat 



Series X, Section 35, Township 18, Range 14, West of the 4th 

 Meridian. 



The samples of this series were collected in a wheatfield, four 

 miles north-east of Brooks, Alta., on Farm 2, Duke of Sutherland 

 Colony. This farm had been under irrigation for a number of years 

 and seemed well adapted to such a means of cultivation, possessing 

 a good slope and a surface soil of dark clay loam with a subsoil con- 

 sisting of sand and clay silt. The yield on the best parts of the field 

 was probably about 32 bushels per acre. The field is about 300 yards 

 west of the main canal and the alkali present, in all probability, has 

 been carried down to this level by seepage. 



