Soil Texture Analysis

Data File Identifier: 
Soil Texture Analysis
Quality Control Level: 
Derived and Interpreted products
Number of header rows in file(s): 
2

Samples
All pits have been analyzed for the 20-50 cm depth range
Only some have been analyzed for 0-20cm, 50-80cm

Procedure
adapted from Gee and Bauder (1986) and Das (1982)

1 Weigh 40 g of the soil sample.
2 Prepare a 5% solution of sodium hexa-metaphosphate (HMP) in water.
3 Add 100 ml of the HMP solution to each soil sample.
4 Make up the volume to 400-450 ml and allow it to soak overnight.
5 Homogenize the sample using a mechanical stirrer/ blender for 2-5 minutes
6 Make up the volume to 1000 ml with distilled water.
7 In case of froth, add 2-3 drops of amyl alcohol .
8 Disperse the suspension by shaking the cylinder.
9 Allow the cylinder and suspension to stand.
10 Dip the hydrometer into the suspension and note the density at intervals of 30 sec, 1 min, 3 min, 10 min, 30 min, 60 min (1 hr), 90 min, 120 min (2 hr) and 1440 min (24 hr ).
11 Pass the suspension through a 53µ sieve; collect the fraction that is retained on the sieve.
12 Air-dry the fraction for a day.
13 Allow the sample to dry in an oven at 105°C until it is devoid of all moisture (i.e. until a constant weight is observed).
14 Pass the dried fraction through a 53µ sieve again and weigh the fraction.
15 Perform a blank (same procedure, but without a soil sample).

Calculations
Weight of clay in the sample = R24* – blank
Weight of sand in the sample = weight of sieved fraction
Weight of silt in the sample = Initial weight of sample – (clay+sand)

% fraction = (weight of fraction/initial weight of the sample) x 100%

*R24 = hydrometer reading at 24 hrs

- Kaizad Patel, 2013

adapted from Gee and Bauder (1986) and Das (1982)

Gee, G. W., and J. W. Bauder. "Particle-Size Analysis." In Methods of Soil Analysis, Part 1, Physical and Mineralogical Methods, 383-411. American Society of Agronomy - Soil Science Society of America, 1986.

Hydrometer Analysis. In Soil Mechanics Laboratory Manual, by Braja M. Das, 23-33. San Jose: Engineering Press, 1982.

Periodicity of Sample Number: 
1.00
Periodicity of Sample: 
month
From Date: 
Wed, 06/01/2011 - Fri, 07/15/2011
Research Location: 
Variables: 
Site Name
Variables: 
Catena
Variables: 
Weight
Variables: 
R24- Clay weight
Variables: 
Sieved Weight
Variables: 
Clay -weight
Variables: 
Sand- Weight
Variables: 
Silt - weight
Variables: 
Clay - percent
Variables: 
Sand - percent
Variables: 
Silt - percent
Dissemination: 
unrestricted
Publish to National CZO: 
Do Not Publish