3H 
Journal of Agricultural Research 
Vol. VIII, No. io 
Sample I was taken from a soil on which all the vines were healthy. 
Samples II and III were obtained from samples of soil taken from the 
same vineyard about 300 yards from Sample I. Sample II was taken 
from between healthy vines, and Sample III from between diseased vines. 
The chemical analyses of these three soils show such similarity of 
composition that they throw no light on the cause of the disease 
(Table I). 
Table I .—Chemical composition of vineyard soils (W) 
[Analysis made by the Division of Soil Bacteriology, University of California.] 
Constituent. 
Sample I 
(soil bearing 
healthy vines). 
Sample II 
(soil bearing 
healthy vines). 
Sample III 
([soil bearing 
diseased vines). 
1 ft. 
2-4 ft. 
1 ft. 
2-4 ft; 
1 ft. 
2-4 ft. 
Insoluble matter . 
72.98 
70 - 75 
75 - 87 
8.03 
•47 
. 26 
075.21 
8.10 
• 5 i 
074. 26 
8.86 
74-77 
9.18 
Soluble silica . 
Potash (KsO). 
.80 
•83 
•35 
Soda (NaaO). 
. 20 
T f imp (CaO). 
1.16 
1.21 
.91 
.06 
I. II 
.88 
Magnesia (MgO). 
I. II 
IS 
.07 
4.88 
6.97 
. 14 
.88 
Brown rorirl of manganese fMnaCb) . 
. 11 
.08 
Petnxid of iron ( Fe^Oa).. 
4 - 38 
5.96 
. 19 
•05 
3- 20 
5-60 
Alumina (AI2O3) .. .■. 
5 - 39 
.18 
5-85 
5 - 55 
. 12 
Phosphoric acid (P2O5) ... 
%?* /V 
. IO 
Sulphuric acid fSoa'l . 
Water and organic matter ... 
2.47 
2.16 
1. 91 
I- 90 
Total . 
100.25 
•073 
IOO. 44 
• O42 
Humus nitrogen in soil, per cent ... 
. 067 
•037 
. 064 
• 027 
An examination of the physical constitution of the soil showed some¬ 
thing more definite (Table II). Two samples were taken in each of 
several vineyards. One of these samples (marked “D”) was taken 
from a spot where the vines were badly diseased, the other (marked 
“H”) from a spot where the vines showed no symptoms of disease. In 
all cases sample D and its companion, sample H, were taken from spots 
as near together as possible and where there was no visible difference in 
color, texture, or situation. 
Table II .—Percentages of coarse material and of water in soil a 
W. VINEYARD (DIFFUSIVE TYPE OF ATTACK; NOT VERY SEVERE) 
Date. 
Depth. 
Coarse material. 
Moisture. 
D 
H 
D-H 
Di 
Hi 
Di-f-Hi 
1912. 
July. 
Feet. 
1 
2 
3 
24-93 
37-15 
27.23 
22.56 
25.60 
25-03 
2-37 
II -55 
2. 20 
4 - 33 
5 - 49 
7-86 
6-39 
7.22 
zo. 20 
Do. 
Do. 
Means. 
29. 77 
24-39 
5-38 
5-89 
7-93 
74-2 
a Determinations made by Mr. L. Bonnet. 
