39 « 
Journal of Agricultural Research 
Vol. I> No. 5 
The low salt content throughout the 4 feet, the relatively high wilting 
coefficients, and the presence so late in the summer of available moisture 
in the third foot are worthy of note. 
Summary of Physical Conditions— The presence of the typi 
shadscale association as it occurs in Toode Valley ntdtcates usuaUy 
(i) a soil of finer texture, having a higher moisture equivalent than 
savebrush land- (2) a deficit in midsummer of moisture available fo 
pit growth; (3) a high salt content of the soil below the depth of 1 or 
2 feet and 4 ) as compared with land occupied by the Kochia associa- 
or scales, which, envelop the fruits. 
tion, a somewhat lighter and more gravelly texture in the first foot and 
a much more uneven surface—conditions which probaby 
better penetration and, hence, in a larger seasonal total of water available 
for plant growth than on Kochia land. 
Adaptations to Physical Conditions 
The dominant species, A triplex confertifolia, need alone be c ° nsl 
in this connection. As shown in figure 9, thi s plant has a well-developed 
