Aug. T9,1918 Availability of Potash in Soil-Forming Minerals 
309 
Table VIII .—Weight of rye crop and potash removed from soil —Continued 
Dry matter (grams). 
Grain. 
Straw. 
Total. 
Aver¬ 
age 
total. 
§ 
Rela¬ 
tive 
rank of 
aver¬ 
age. 
3 -o 
1S-6 
18.6 
3-8 
15-0 
18.8 
18.5 
38.7 
3 -i 
IS-2 
18.3 
2.8 
14.6 
17.4 
2.8 
13*8 
16.6 
17.8 
37-3 
3-6 
IS-8 
19.4 
3-6 
16.0 
19.6 
1 
4-0 
17.0 
21.0 
f 19-5 
40.8 
2.1 
15*8 
17.9 
J 
3.00 
16.6 
19.6 
I 
2.6 
16.4 
19.0 
f 19 -0 
39-8 
2.4 
16.0 
18.4 
) 
Treatment. 
Potash removed (grams). 
Grain. 
Straw. 
Total. 
Aver¬ 
age 
total. 
Aver¬ 
age 
gain 
over 
no 
pot-' 
ash. 
Orthoclase. 
Do. 
Do. 
3 orthoclase... 
Do... 
Do.. 
2 orthoclase plus calcium car¬ 
bonate . 
Do. 
Do. 
2 orthoclase plus 2 calcium car¬ 
bonate . 
Do. 
Do. 
o. 022 
.024 
• 025 
.020 
.020 
.026 
.024 
.029 
.020 
• 025 
.019 
• 023 
o'. 106 
. IOO 
. 102 
. IOO 
.090 
. no 
.102 
.103 
. IOO 
. 104 
. 104 
.103 
o. 128 
.124 
. 127 
. 120 
. no 
.136 
. 126 
.132 
. 120 
. 129 
• 123 
. 126 
o. 126 
. 126 
. 126 
°53 
.049 
053 
-053 
Rye seems to re¬ 
move more potash 
from the micas than 
from the feldspars. 
Microcline gives prac¬ 
tically the same yield 
as when no potash is 
added. Orthoclase has 
given slightly greater 
yields, but nothing 
like so great as those 
of biotite and musco¬ 
vite (PI. 49, C). 
In figure 3 will be 
found the graphical 
representation of rye 
produced with double 
applications of potash 
and lime. 
As with the crop of 
oats, lime has pro¬ 
duced very slight, if 
any, effect on liberat¬ 
ing potash from the 
insoluble forms. 
Neither has crop 
growth nor the 
2 POTASS/UAf SULPHATE 
2 POTASS/UAf SULPHATE-A Ca CO 3 
2 B/OT/TE 
2 B/OT/TE ^ACaCOs 
a AfUSCO V/TE 
a AfUSCO 1 //TE A Ca CO 3 
2 OTHOCLASE 
2 OTHOCLASE ACa CO$\ 
2 Af/CPOCL/AAE 
2 Af/CPOCL/AAE A Ca CO 3 
COA/TPOL 
COATTPQL +C<Z CO 3 
Fig. 3.—Rate of growth of rye under similar conditions fertilized with 
double applications of potash minerals and calcium carbonate. 
amount of potash removed by the crop been increased by its use 
