Phosphates 9.04

These substances were for the most part insoluble in earth, and must
have been dissolved during the growth of the crop.

ANALYSIS OF FIVE SAMPLES OF TOBACCO.
No. 1. No. 2. No. 3. No. 4. No. 5.
Grown on argillaceous soil Grown in calcareous soil.
Potash 29.08 30.67 9.68 9.36 10.37
Soda 2.26 -- -- -- .36
Lime 27.67 24.79 49.28 49.44 39.58
Magnesia 7.22 8.57 14.58 15.59 15.04
Chloride of sodium .91 5.95 4.61 3.20 6.39
Chloride of potassium -- -- 4.44 3.27 2.99
Phosphate of iron 8.78 6.03 5.19 6.72 7.56
Sulphate of lime 6.43 5.60 6.68 6.14 9.42
Silica 17.65 18.39 5.54 6.28 8.34
----- ----- ----- ----- -----
100.00 100.00 100.00 100.00 100.00

From the above it will be seen that on the argillaceous soil the
tobacco contained a large quantity of alkalies and silica, while on
the other hand, the lime, magnesia and chlorides were high in
proportion, in the tobacco grown on calcareous soil.

There is no doubt that the manure which contains the largest
proportion of alkaline carbonate, magnesia, lime and gypsum, is that
best adapted for tobacco.

I give an analysis taken from Prof. Johnston's "Lectures," (2nd
edition) of the ash of the tobacco leaf and the composition of a
special manure for tobacco:--

Potash 12.14
Soda 0.07
Lime 45.90
Magnesia 13.09
Chloride of sodium 3.49
Chloride of potassium 3.98
Phosphate of iron 5.48
Phosphate of lime 1.49
Sulphate of lime 6.35
Silica 8.01
------
100.00

All the ingredients which are necessary to replace 100 lbs. of the ash
of tobacco leaves are present in the following mixture:--

Bone dust, sulphuric acid 23 lbs.
Carbonate of potash (dry) 31 "
Carbonate of soda (dry) 5 "
Carbonate of Magnesia 25 "
Carbonate of lime (chalk) 60 "
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