﻿THE RESEEBING OF DEPLETED GRAZING LANDS. 9 



3. Wrong selection of species. 



4. Spring sowing. 



5. Excessive competition with native vegetation. 



6. Wrong time of sowing (other than spring). 



It is interesting to compare the following statement as to the 

 chief reasons for only partial successes: 



1. Spring sowing. 



2. Lack of soil treatment. 



3. Drought. 



4. One or more species unadapted. 



5. Excessive competition with native vegetation. 



6. Wrong time of sowing (other than spring)., 



7. Overgrazing. 



8. Excessive moisture for species sown. 



Within the altitudinal limits at which the conditions governing 

 growth are favorable, and on the lands adapted to the growth of 

 cultivated forage plants, the factors which bring about failures are 

 largely preventable. The lack of soil treatment, which, it will be 

 noted, leads as a factor in the causes of failure, is, by the proper 

 handling of the lands, preventable in virtually all cases ; the drought 

 factor, except possibly during seasons of unusual weather conditions, 

 ma}^ be eliminated by the judicious selection of the lands to be seeded ; 

 wrong selection of species is largely avoidable when the soil, moisture 

 conditions, altitude, and the requirements of the species used are 

 known; failure due to spring and summer seeding should be avoid- 

 able since it is generally known whether or not enough precipitation 

 is received during the growing period to insure continued vigorous 

 growth. 



It will be noted that, in the main, the same causes which were 

 operative in the case of failures were also responsible for only par- 

 tial successes; and that while the arrangement of the chief causes 

 in the two cases is somewhat different, the lack of soil treatment is 

 of vital importance in both. 



Consideration of further results of the extensive experiments will 

 be deferred until an account of the intensive studies has been given, 

 when the conclusions reached as a consequence of both series of 

 studies can be most intelligibly presented. 



INVESTIGATIONS IN THE WALLOWA MOUNTAINS. 



These investigations, conducted on a series of plots at various ele- 

 vations, were planned with a view to obtaining precise data upon 

 physical and climatic conditions which might be expected to play an 

 important part in determining the success or failure of each experi- 

 ment. 



5775°— Bull. 4—13 2 



