904 
Journal of Agricultural Research voi. xxvn, no. 12 
The location of this association, as we examined it, in the path of the 
winds sweeping over Stockton bar from the southwest, results in the 
early desiccation of all the herbaceous vegetation. Only the few deeper- 
rooted woody species are available later in the season. Our series of 
determinations is, therefore, limited. 
The available constants for the species of this association are given in 
Table V. 
Table V .—Physicochemical constants for species of the sand-hill mixed association 
Growth form and species. 
Date. 
Freezing 
point 
depres¬ 
sion, 
A. 
Atmo¬ 
spheres 
osmotic 
concen¬ 
tration, 
P. 
Specific 
electrical 
conduc¬ 
tivity, 
K. 
Ratio, 
conduc¬ 
tivity to 
depres¬ 
sion, 
K/A. 
Chlo- 
rids 
per 
liter, 
Cl. 
TREES AND SHRUBS 
• 
Juniperus utahensis (Engelm.) 
1920. 
Lemmon. 
June 3 
1.85 
22.3 
O.OI18 
0.0063 
1-7 
June 11 
I.78 
21.4 
.0127 
.0071 
1-3 
Average. 
1.82 
21.9 
.0122 
.0067 
1-5 
Artemesia tridentata Nutt. 
June 3 
i -59 
19.2 
.OI79 
.0112 
2.7 
June 11 
1.61 
19.4 
.0221 
•0137 
2.6 
Average. 
1.60 
19-3 
.0200 
.0125 
2.7 
Grayia spinosa (Hook.) Moq. 
June 3 
1.72 
20. 7 
.O429 
.0249 
4-5 
ANNUAL HERBS 
A bronia salsa Rydb. 
Tune 2 
0.87 
IO.4 
.0210 
.0243 
J O 
June 11 
0.88 
10.6 
.0248 
.0282 
1.6 
Average. 
0.88 
.0229 
.0262 
1.6 
Balsamorrhiza hirsuta Nutt. 
June 3 
1.09 
1 3 - 1 
.0203 
.0187 
1.4 
Anogra pallida (Dougl.) Britt. 
....do- 
0.85 
10.3 
.OI45 
.0170 
2.0 
June 11 
0.79 
9-5 
.O163 
.0208 
1.6 
Average. 
0.82 
9.9 
.OI54 
.0189 
1.8 
Castilleja hispida Benth. 
June 3 
i -52 
18.3 
.0316 
.0207 
2.7 
June 11 
1.80 
21.6 
.0342 
.OI9O 
2.8 
Average. 
1.66 
20.0 
.O329 
.OI99 
2.8 
C.haenactis stwioides H A , ... 
Tune 3 
0.04 
11 .2 
. 022? 
. 02^7 
Delphinium sp. 
....do— 
1.30 
15.6 
.0271 
* O / 
.0208 
1.6 
Eriogonum ovalifolium Nutt. 
I.21 
14.6 
.O163 
•0134 
2.9 
June 11 
1.23 
14.8 
.OI79 
.OI46 
Average. 
1.22 
14.7 
.0171 
.0140 
2.9 
Oreocarya sp. 
June 3 
O.89 
10.7 
/ 
.OI9I 
.0215 
i *7 
Zygadenus paniculatus S. Wats. 
June 11 
I. II 
j 13-4 
.0115 
.0104 
0.2 
KOCHIA ASSOCIATION 
The Kochia association, composed almost exclusively of the half¬ 
shrub, Kochia vestita, occupies a narrow belt extending nearly across 
the valley between the lower limits of the sagebrush association and 
the upper limits of the shadscale association. 
