4 BULLETIN 4, U. S. DEPARTMENT OF AGEICULTUEE. 



Both extensive and detailed studies have been carried on during 

 the past five years. As a result it is now possible to give some def- 

 inite information concerning (1) where reseeding may profitably be 

 undertaken as shown, for example, by the soil and the character of 

 the native vegetation; (2) what species to use; (3) when to sow; and 

 (4) what soil treatment should be applied under the various 

 conditions. 



LOCATION AND CHARACTER OF THE REVEGETATION STUDIES. 



Since the National Forests extend from the Canadian to the Mexi- 

 can line and embrace all the important gradations of climate, alti- 

 tude, moisture, and soil conditions, the investigations were extended 

 over as wide a territory as possible. The location of the experiments 

 is shown in figure 1. 



Fig. 1. 



Location of the reseeding projects on grazing areas within the National Forests. 

 The star indicates the area where the most intensive study was made. 



It will be seen that experimental reseeding has been undertaken in 

 11 States. Eighty-six important grazing forests out of the 163 Na- 

 tional Forests Avere included in the study, and more than 500 individ- 

 ual experiments were established. 



To supplement these extensive experiments conducted by local 

 forest officers, a series of detailed studies was carried out by the 

 writer on the Wallowa National Forest, in northeastern Oregon. 

 These intensive studies were begun in 190T, and were made upon 

 small plots of varying local conditions. Special attention was given 

 to determining the exact causes of failure or success of seeding 

 through careful observations of the potent factors (especially the 

 temperature and soil-moisture conditions during the main growing 

 season) likely to influence the results. 



