To Study The Texture of Soil Samples 12th bio. Practical no.15

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  • Опубликовано: 16 сен 2024
  • Procedure
    Three methods are suggested here. Any one of these may be followed.
    Method I
    (i) Collect about 300-500g of soil from two different locations. Label them as sample A and B.
    (ii) Dry the samples in an oven, or stove or in sun to remove the soil moisture (capillary and
    bound water).
    (iii) Select the 3 sieves of different mesh sizes (2mm, 0.05mm and 0.002mm). Arrange them in
    a collecting chamber as shown in Fig. 15.2.
    (iv) Place 200g of the soil in the Ist sieve (sieve of 2mm mesh) and close the lid. To sieve the soil,
    shake the set manually for 5-10 minutes and collect the three soil fractions.
    (v) Weigh the soil fractions viz-sand, silt and clay
    collected in the 3 compartments
    Wt of soil sample taken - .........g
    Wt of sand fraction - .........g
    Wt of silt fraction - .........g
    Wt of clay fraction - .........g
    The weight of three fractions should be equal to the
    total weight of sample taken for analysis.
    Calculate the percentages of the various soil fractions
    and tabulate:
    Calculate the percentages of sand, silt and clay
    fractions.
    Use the textural triangle now. Note that the three
    sides of the textural triangle represent 0 to 100% of sand,
    silt and clay respectively. Note that (i) the percentage
    lines for clay run paralled to the base line of sand
    the precentage lines of silt run parallel to the clay side of the triangle and, (iii)
    perentage lines of sand run parallel to the silt silde of the triangle. In reading
    the textural triangle, any two particle fractions will locate the textural class at
    the point where these two intersect.

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