12 CULTIVATION METHODS AND KOTATIONS FOR GREAT PLAINS. 



The view of field plats at the substation at Edgeley, N. Dak. (see 

 frontispiece) , where these investigations are carried on in cooperation 

 with the North Dakota Agricultural Experiment Station, is typical of 

 all the field stations. From 120 to 150 one-tenth acre plats are used 

 at each station. These plats are accurately and permanently laid out 

 and marked and great care is exercised to obtain exact yields, com- 

 parable to common field conditions. 



It would be practically impossible to carry on these investigations 

 without the hearty cooperation of the state experiment stations of 

 Montana, North Dakota, Nebraska, and Kansas. 



The Physical Laboratory and the Offices of Western Agricultural 

 Extension, Alkali and Drought Resistant Plant-Breeding Investiga- 

 tions, Grain Investigations, Forage-Crop Investigations, and Soil- 

 Bacteriology Investigations, all of the Bureau of Plant Industry, have 

 cooperated and rendered valuable assistance along their respective 

 lines. None of the results of their investigations have, however, been 

 incorporated in this publication. The interrelation of these several 

 lines of investigations with those of dry-land agriculture will be 

 discussed in future publications. 



THE SUFFICIENCY OF THE DATA SUBMITTED. 



As the general plans of the investigations in dry-land agriculture, 

 of which those herein described are a part, have been fully set forth 

 in a previous publication, no detailed description will here be 

 attempted. Suffice it to say that a member of the scientific staff of 

 this office is in constant attendance at each of the several stations 

 mentioned, during the entire growing and harvesting season. He 

 attends personally to all the field operations, the measuring and 

 weighing of products, etc., and keeps accurate notes of the work. b 

 The work is in close cooperation with the Physical Laboratory of this 



a Yearbook of the Department of Agriculture for 1907, pp. 451-468. 

 b The field work at the several stations is under the immediate supervision, respec- 

 tively, of the following-named members of the scientific staff of this office: 

 John S. Cole, Traveling Field Assistant. 

 J. E. Payne, Superintendent Akron, Colo., station. 

 F. L. Kennard, Superintendent Dalhart, Tex., station. 

 J. M. Stephens, Superintendent Judith Basin, Mont., station. 

 0. J. Grace, Acting Superintendent Dickinson, N. Dak., station. 

 W. W. Burr, detailed to North Platte, Nebr., station. 

 E. F. Chilcott, detailed to Amarillo, Tex., station. 

 A. L. Hallsted, detailed to Hays, Kans., station. 

 H. R. Reed, detailed to Garden City, Kans., station. 



0. R. Mathews, detailed from the Office of Western Agricultural Extension, Bureau 

 of Plant Industry, to Bellefourche, S. Dak., station. 

 C. H. Plath, detailed to Edgeley, N. Dak., station. 

 J. C. Thysell, detailed to Dickinson, N. Dak., station. 



W. O. Whitcomb, detailed from the Office of Western Agricultural Extension, Bu- 

 reau of Plant Industry, to Williston, N. Dak., station, 

 187 



