What are the methods of soil-testing?
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The tests on soil are as follows.
Moisture content test
Atterberg limits tests
Specific gravity of soil
Dry density of soil
Compaction test (Proctor’s test). thanks
Moisture content test
Atterberg limits tests
Specific gravity of soil
Dry density of soil
Compaction test (Proctor’s test). thanks
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Test Method no. 102(i) Dry Soil Sample Preparation
Soil for chemical analyses is dried by being spread out in a tray and placed in a forced air drying cabinet kept at around 35 °C. Dry soil is ground in a roller mill until it passes a 2-mm sieve. Where a test uses a small sample weight, a more homogeneous subsample is prepared by further grinding using a ring and puck mill to pass a 0.25-mm sieve. The procedure is based on that described by Metson (1971).
Metson, A.J. 1971. Methods of Chemical Analysis for Soil Survey Soils. New Zealand Soil Bureau Bulletin 12.
Test Method no. 102(ii) Wet Soil Sample Preparation
Soil for biochemical analyses is sieved in a field-moist condition by gently pushing through a sieve of mesh size in the range 4 – 6mm. If the soil is too wet, such that it smears on the sieve, it is first partially air-dried by spreading out in a thin layer and blowing room-temperature air across the surface with a domestic fan and turning regularly by hand. During sieving, material such as grass and stones are picked out and removed together with anything that may have been live at the time of sampling such as roots and earthworms. The procedure is based on that described by Ross (1971).
Ross, D.J. 1971. Modifications to the fumigation procedure to measure microbial biomass C in wet soils under pasture: influence on estimates of seasonal fluctuations in the soil biomass. Soil Biology and Biochemistry 20(3):377 – 383.
104 Moisture Factor
Test Method no. 104(i) Moisture Factor
(Formerly 104)
Since the moisture content of an air-dry soil varies with time and conditions of storage such as air temperature and humidity, it is more satisfactory to express analytical results on an oven-dry rather than an air-dry basis.
However, as oven-drying at 105 °C may cause changes in some chemical properties air-dry samples are analysed and a moisture factor is applied in the calculation to convert results to an oven-dry basis. A subsample of air-dried soil is weighed into a can and oven-dried overnight at 105 °C. The loss in weight due to moisture driven off is used to calculate a moisture factor for that sample. The procedure is based on that described by Blakemore et al (1987).
Blakemore, L.C.;Searle, P.L.; Daly, B.K. 1987. Methods for Chemical Analysis of Soils. NewZealand Soil Bureau Scientific Report 80.
Test Method no. 104(ii) Water Content
Test Method no. 104(iii) Water Holding Capacity
105 Bulk Density
106 pH
Test Method no. 106(i) pH in Water 1:2.5 ratio
(formerly 106)
Test Method no. 106(ii) pH in Water 1:5 ratio
(formerly 106)
Test Method no. 106(iii) pH in 0.01M CaCl2
(formerly 106)
Test Method no. 106(iv) pH in 1 Mkcl
(formerly
108 pH in H202
Soil for chemical analyses is dried by being spread out in a tray and placed in a forced air drying cabinet kept at around 35 °C. Dry soil is ground in a roller mill until it passes a 2-mm sieve. Where a test uses a small sample weight, a more homogeneous subsample is prepared by further grinding using a ring and puck mill to pass a 0.25-mm sieve. The procedure is based on that described by Metson (1971).
Metson, A.J. 1971. Methods of Chemical Analysis for Soil Survey Soils. New Zealand Soil Bureau Bulletin 12.
Test Method no. 102(ii) Wet Soil Sample Preparation
Soil for biochemical analyses is sieved in a field-moist condition by gently pushing through a sieve of mesh size in the range 4 – 6mm. If the soil is too wet, such that it smears on the sieve, it is first partially air-dried by spreading out in a thin layer and blowing room-temperature air across the surface with a domestic fan and turning regularly by hand. During sieving, material such as grass and stones are picked out and removed together with anything that may have been live at the time of sampling such as roots and earthworms. The procedure is based on that described by Ross (1971).
Ross, D.J. 1971. Modifications to the fumigation procedure to measure microbial biomass C in wet soils under pasture: influence on estimates of seasonal fluctuations in the soil biomass. Soil Biology and Biochemistry 20(3):377 – 383.
104 Moisture Factor
Test Method no. 104(i) Moisture Factor
(Formerly 104)
Since the moisture content of an air-dry soil varies with time and conditions of storage such as air temperature and humidity, it is more satisfactory to express analytical results on an oven-dry rather than an air-dry basis.
However, as oven-drying at 105 °C may cause changes in some chemical properties air-dry samples are analysed and a moisture factor is applied in the calculation to convert results to an oven-dry basis. A subsample of air-dried soil is weighed into a can and oven-dried overnight at 105 °C. The loss in weight due to moisture driven off is used to calculate a moisture factor for that sample. The procedure is based on that described by Blakemore et al (1987).
Blakemore, L.C.;Searle, P.L.; Daly, B.K. 1987. Methods for Chemical Analysis of Soils. NewZealand Soil Bureau Scientific Report 80.
Test Method no. 104(ii) Water Content
Test Method no. 104(iii) Water Holding Capacity
105 Bulk Density
106 pH
Test Method no. 106(i) pH in Water 1:2.5 ratio
(formerly 106)
Test Method no. 106(ii) pH in Water 1:5 ratio
(formerly 106)
Test Method no. 106(iii) pH in 0.01M CaCl2
(formerly 106)
Test Method no. 106(iv) pH in 1 Mkcl
(formerly
108 pH in H202
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