438 



Journal op the Department of agriculture. 



Table /. 

 Analysis of Soils from, Paardenverlies . 



No. 612. 

 Zandbult. 



Mechanical Analysis. 



Colour 



Fine earth, below 1 mm. 



Coarse sand, 1-0-2 mm. 



Fine sand, 0-2-0 -04 mm. 



Silt, 0-04-0-01 mm. 



Fine silt, 0-01-0-002 mm 



Clay, below 0-002 mm. .., 



Soluble in N/5 Hydrochloric acid 



Reaction to Litmus 



Carbonates... 



Humus 



Loss on Ignition ... 



Moisture 



Permeability to water ... 



Chemical Ajialyxin 

 Nitrogen 



Insoluble inorganic residue 

 Lime 



Magnesia ... 

 Potash 



"Available" Potash 

 Phosphoric Oxide... 

 "Available" Phosphoric Oxide . 



Light reddish 

 brown. 

 Per Cent. 

 100 

 21-24 

 54-63 

 3 

 3 



• 66 

 •9 



11-75 

 0-56 



Acid. 

 Nil. 

 1-93 

 3-2 

 0-83 

 3-35 



0-08 

 ?8-C. 

 0-35 

 0-24 

 - 40 

 0-006 

 0-053 

 0-003 



Dark reddish 

 brown. 

 Per Cent. 

 100 

 15-25 

 46-41 

 10-95 

 9-39 

 11-82 

 0-67 

 Acid. 

 0-005 

 1-96 

 3 • 5 

 0-82 

 • 53 



O-ll 

 88-2 

 0-28 

 0-20 

 0-57 

 0-032 

 0-048 

 0-013 



No. 614. 



Under 

 Dolerite 



Ridge. 



Black. 



Per Cent. 

 100 



8-38 

 33-06 

 14-08 

 16-07 

 19-95 



0-71 

 Acid. 



0-005 



3-6 



5 • 5 



1-96 



- 34 



0-1.-) 

 83-7 

 0-53 

 O-.oO 

 0-47 

 0-033 

 0-100 

 0-018 



Discussion of Analytical Results. 



Particulars of the analytical processes by which the above results 

 were obtained will form an appendix to this report. 



Mechanical Analysis. 

 Tlie analysis shows that the soil particles have been sorted out 

 into five groups, i.e. — 



(1) Coarse sand, 1.0.2 mm. 



(2) Fine sand, 0.2-0.04 mm. 



(3) Silt, 0. 04-0. 01 mm. 



(4) Fine silt. 0.01-0.002 mm. 



(5) Clay, below 0.002 mm. 



The figures which immediately follow the group name indicate 

 the diameter of the particles in the group. For example, coarse 

 sand, 1-0.2 mm., means that the diameter of particles classed as 

 coarse sand varies between one millimetre* and 0.2 millimetre. 



A few words concerning the principal properties of the various 

 groups will not be out of place. 



It has already been indicated that the clay particles are the 

 finest, the sand particles the coarsest, and the silt particles inter- 

 mediate in size, also that the properties of the various particles 



One millimetre is roughly ^^^ of an inch. 



