A Study of the Vegetation of 



Thus it may be seen that topography with soil texture is the great 

 middleman that distributes the soil moisture to fill the gigantic 

 earthen reservoir, which again is largely emptied during the fol- 

 lowing growing season. The common farm practice in the 

 Palouse Region of alternating season after season the growing 

 of wheat with summer fallow, is a method of storing the mois- 

 ture from one year for use in the growth of the next year's crop. 



TABLE VI 



THE MARCH OF SOIL WATER ON A NORTHWEST AND SOUTH SLOPE RESPEC- 

 TIVELY. 1914 



The differences in soil temperature on the two slopes and at 

 various depths may be briefly noted here. Table VII gives the 

 soil temperature at a depth of 3 inches on the two slopes respec- 

 tively, for three representative days in July, 1914. The higher 

 temperature prevailing on the south slope as well as the greater 

 range in temperature is very marked. 



TABLE VII 

 SOIL TEMPERATURE AT A DEPTH OF 3 INCHES 



52 



