52 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 
Tue Marcu oF Soin WATER ON A NoRTHWEST AND SouTH SLOPE RESPEC- 
TIVELY. 1914 
May 22 July 6 August 15 
Ol = 6 IN EWivisc ew tsciie cic ; 23.4% Sse 11.6 
Sines eae le Oe eee re ae 12:5 15 Oe 8 Ory 
OHTA NRW tha cles eves ale «6 2557 Tey I2.I 
SSS So een aes ain 17.9 I1.4 10.2 
At oe ONWRE otis cates ois 27.0 18.9 I1.8 
Bead Seen eiaciencl 19.9 1276 10.2 
At ol MINSW ives eta eects 30.2 Clee 14.4 
Shs hea oat ees 20.2 TBv2 10.6 
PAUSE INE Wi Soe emia cnseercnts 27.2 24.9 18.0 
Sere ml cictaiues hePawe be 22.0 1H fe: 10.5 
Ate te IN Wig ove st atte hsheaenstia 24.3 21.3 19.5 
SD orators! aes nel pulaersis 22.4 19.6 12.3 
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 
Soi, TEMPERATURE AT A DEPTH OF 3 INCHES 
Station Minimum Time Maximum Time Range Day 
——— | f= 
A.M. P.M. 
N:E. slope’.. .... (Chawla 5 75.0 2 ITS July 27 
S.W. slope ..... 57.0 7 93.0 4 26.0 July 27 
NE Sloper. eee 59.0 5 Theol ss i es July 28 
S.W.slope..... 68.0 7 94.0 ‘4 26.0 July 28 
N.Eoslope? <. <. 61.0 5 73.5 3 T255 July 29 
S.W. slope’. .... 67.0 Fi 95.0 4 26.0 July 29 
52 
