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Principles and requirements for the soil texture analysis according to methods recommended by International Standard Organization [ISO]

100%

Drzymala S.

Acta Agrophysica

2000

tom 35

For several years now the Polish Normalisation Committee (PKN) has been angaged in the process of introduction (and implementation) of international standards complying with the Internationsl Standard Organsation (ISO) into the set of of Polish Standards.At present, in the PKN Commission of Soil Physics, a number of such standards are being prepared (translated) -including a very comprehensive standard dealing with partiele size distribution determination in soil material-ISO 11277 [6], Some principles and requirements included in this standard differ significantly from those commonly accepted and widely in use now in numerous pedologie laboratories in Poland [7,8]. Below there are some of the most important differences: (1 ) the requirement to remove organic matter from test samples (using 30% v/v solution of H2O2), (2) the requirement to remove water soluble salts and gypsum (to electrical conductivity 0,4 dS/m), (3) sample dispersion process must be longer than 18 hours. Many other requirements, of relatively lesser importance, in many cases also do not correlate with those commonly accepted in our laboratories.

Comparison of soil texture classification according to the new Polish Standard, PTG and international classifications [FAO and USDA]

100%

Drzymala S.

Acta Agrophysica

2000

tom 35

The classification into soil fractions found in the new Polish Standard PN-R-04033 is fully comparable- with the international classifications (FAO/USDA) in question. The following diameters were adopted as the main groups of soil fractions: stones >75 mm, gravel 75-2 mm, sand 2.0-0.05 mm, silt 0.05-0.002 mm and clay <0.002 mm. On the other hand, soil fractions classification according to the Polish Soil Science Society (PTG), including so-called fine particles (<0.02 mm), is not compatible with both the new Polish Standard and the discussed international classifications. This also refers lo the classification into textural groups according to PTG. However, the classification into textural groups according lo Polish Standard is quite similar to international classifications.

Ograniczanie wyników

2 Acta Agrophysica

2 Drzymala S.

2 2000

Wyniki wyszukiwania

Principles and requirements for the soil texture analysis according to methods recommended by International Standard Organization [ISO]

Comparison of soil texture classification according to the new Polish Standard, PTG and international classifications [FAO and USDA]