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1

Distribution of potassium in granulometric soil fractions

100%
Brogowski Z., Uziak S., Komornicki T.
Polish Journal of Soil Science
|
2009
|
tom 42
|
nr 1
53-68
The content of the total potassium in particular granulometric fractions increases from a sand fraction (1-0.1 mm) to fine silty clay (0.002-0.005 mm), while in the clay fraction it usually decreases. The most diverse fractions in terms of potassium content are those extracted from mountain soils developed from old Cretaceous and Tertiary forms. Granulometric fractions extracted from soils developed from loessial sediments are homogenous with regard to the total potassium content. In those sediments there is a close parallelism between the amount of a given fraction in the soil and the amount of potassium contained in the fraction. This relation laid behind this attempt to calculate the coefficients for the total potassium content in soils on the basis of the granulometric analysis.
2
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Statistical relationship between selected physicochemical properties of peaty-muck soils and their fraction of humic acids

84%
Boguta P., Sokolowska Z.
International Agrophysics
|
2014
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tom 28
|
nr 3
Influence of humic acids on soil environment is still subject of scientific discussions. The aim of above studies was to investigate the relationships between selected physicochemical properties of eleven peaty-muck soils and properties of humic acids isolated from these soils. The following parameters were determined for soils: total and organic carbon, density, ash, humifi- cation, and the water absorption index. Humic acids were described by: absorbance at 280 nm, absorbance ratios at 465 and 665 nm, at 260 and 665 nm, elemental composition and atomic ratios: H/C, O/H, O/C, C/N, the degree of internal oxidation, and the content of carboxylic and phenolic groups. Statistical analyses showed that an increase in density, humification, and water absorption indices of soils caused a significant increase in the humic acid parameters: absorbance at 280 nm, the oxygen content, O/H, O/C ratios, inter- nal oxidation degree, and functional groups. Statistically signifi- cant negative correlations were found for the same parameters of soils and for the hydrogen and carbon content as well as the H/C ratio of humic acids. The relationships showed that there was a pos- sibility to express the properties of humic acids on the basis of more simple parameters measured for soil and without time-consuming isolation of humic acids.
3

Distribution of total iron in granulometric fractions of soils derived from various parent materials

84%
Brogowski Z., Uziak S., Komornicki T.
Polish Journal of Soil Science
|
2007
|
tom 40
|
nr 2
147-163
The studies were carried out on material representing 13 different soil profiles from various regions of Poland. The content of total iron in 6 granulometric fractions of soils derived from various parent material showed high variation. The most varied with respect to the content of iron are the clay fractions, and the least are silt and sand fractions. The richest in total iron are fractions occurring in smallest amounts, and the poorest are those which dominate in granulometric composition.
4
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Comparison of soil texture classification according to the new Polish Standard, PTG and international classifications [FAO and USDA]

84%
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.
5

Mineral and organic sorbents and selection of metal fractions. Part I. The influence of silicates and humic acids on the content of fractions of aluminium and manganese in the soil underneath two varieties of wheat

67%
Badora A.
Polish Journal of Soil Science
|
2010
|
tom 43
|
nr 2
The application of some of the agents such as the organic substance or silicon compounds may, under certain conditions, control the level of ions of toxic matter in the soil solution. The aim of this work was to explore the influence of the artificial humic acids and sodium silicate present in the soil on the modification of the content of various fractions of aluminium and manganese in the soil samples collected after harvesting two varieties of wheat (HeliaandIsmena) within two phases: earing and full maturity. The scheme of the experiment research included 11 scenarios (A), two varieties of spring wheat (B), as well as two of the plants development stages (C) within two repetitions. Scenarios (A) of the experiment were designed through the insertion into the selected pots of the soluble aluminium and manganese salts, as well as the immobilising agents. The concurrent addition of the organic substance (humic acid sodium salt) and the mineral substance (sodium metasilicate) reduced to the highest degree the level of the mobile forms of aluminium and manganese in the soil environment. Moreover, it influenced the creation of the largest number of ‘weak’ and ‘strong’ bondings between Al and the organic substance, as well as ‘weak’ bondings between Mn and the organic substance.
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