418 
REPORT OF CHEMICAL LAHORATORY 
Analyses 
of surface soil and 
sub-soil from a good gum-yielding geneina: — 
Description 
— 
Surface soil 
Sub-soil at 
10 ft. depth 
Number 
— 
' 093 
091 
Mechanical 
Analysis ... 
Fine gravel... 
Coarse sand 
Fine sand ... 
Silt . 
Pine silt 
Very line silt 
Clay . 
(3-0 to 1-0 mm. diameter) 
... (1-0 to 0-2 „ „ 
... (0-2 to 0-04 „ „ ) 
... (0-04 to 0-01 „ „ ) 
... (0-1 to 0-004 „ „ ) 
... (0-004 to 0-002 „ „ ) 
... (0-002 to - „ „ ) 
95-.a3 
0-00 
0-23 
0-82 
1-38 
0-02 
90-85 
0-87 
0-20 
0-50 
5-17 
Moisture ... 
0-02 
0-10 
Insoluble in hydrochloric acid 
97--57 
90-08 
Total nitrogen 
0-036 
0-014 
Nitrogen as nitrates . . 
traces only 
traces only 
Carbonates expressed as CaCO,, . 
0-031 
0-030 
Chemical 
E.rfractcd bij hoilimj lujdrovhloric add 
Analysis 
Lime (CaO) 
traces 
0-132 
Magnesia (MgO) 
0-099 
0-126 
Potash (K,0) .. 
0-123 
0-113 
Phosphoric acid (P^O^) . 
0-017 
0-014 
Soluble in 1 per cent, dfric add 
Available phosplioric acid (P.jOj) 
0-0025 
0-0011 
Available potash (K.jO) 
0-11181 
(i-oons 
Examination 
was also made 
of a sample of soil from one of the depressions, hardly 
deep enough 
to be called valleys, 
where no hashab growth is found. This soil is always 
darker than that of the geneinas in 
which hashab thrives. 
i 
Per cent. 
lusoluble in acid 
95- 7o 
Nitrogen 
0-041 
Nitrogen as nitrates 
0-l)(H 
Carbonates expressed as CaCO^ . 
0-091 
Soluble ill boilinrf hydrochloric acid. 
Lime (CaOJ 
0-263 
Magnesia (MgO) 
0-995 
PhosjDhoric acid (P.>Og) 
0-021 
Potash (K.,0) . 
0--20I) 
Sohible in 
per cent, citric add 
Available potash (K^O) 
0-018 
„ phosphoric acid (P.jOj) . . 
0-002 
