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  1. 42 International Agrophysics
  2. 18 Acta Agrophysica
  3. 8 Polish Journal of Soil Science
  4. 6 Bibliotheca Fragmenta Agronomica
  5. 5 Zeszyty Problemowe Postępów Nauk Rolniczych
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  1. 1 2020
  2. 1 2016
  3. 2 2014
  4. 1 2013
  5. 2 2011
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  1. 18 Witkowska-Walczak B.
  2. 7 Turski M.
  3. 6 Lipiec J.
  4. 5 Blum W. E. H.
  5. 5 Mentler A.
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1
Content available Effect of Unitary Soil Tillage Energy on Soil Aggregate Structure and Erosion Vulnerability
100%
Wojciechowski T. , Mazur A. , Przybylak A. , Piechowiak J.
Journal of Ecological Engineering
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2020
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tom Vol. 21, nr 3
180--185
EN
The integrated soil tillage developed in the Institute of Biosystem Engineering is based on a single pass of basic tillage, secondary tillage and sowing or planting. The integrated soil tillage enables to achieve a relatively high mechanical strength of the soil. An important element of the technology is the use of tillage roller sets which significantly influence the obtained aggregate structure and its eolic resistance. The aim of the study was to determine the influence of roller speed under various soil moisture conditions on the aggregate structure of the arable soil layer. The research was carried out on the production field in Dziećmierowo, Wielkopolska Voivodeship, Poland, on medium soil with the mechanical composition of light clay. During the research, cultivation sets with two units of Campell + Croskill platelet and studded rollers were used. For two actual soil moisture levels and five speeds within the range of 3–7 km/h, the influence of unit tillage energy at three levels of the cultivating layer (0–5 cm, 5–10 cm and 10–15 cm) was analyzed on the aggregate structure of soil and the content of aggregates with the highest resistance to wind erosion. The results of the work lead to the conclusions that it is possible to use the working speed and overloading of rollers set in integrated soil tillage trailer to manipulate the process of forming an optimal, erosion-resistant soil layer. However, it should be pointed out that for even very similar types of roller sets, the process control under different soil moisture conditions may be different and require an individual test.
2
Morphological characteristics of soil structural aggregates in soils derived from silt
100%
Slowinska-Jurkiewicz A. , Pranagal J. , Lazarz M.
Polish Journal of Soil Science
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1998
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tom 31
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nr 2
3
Content available Hydrophysical characteristics of rendzina aggregate structure
100%
Witkowska-Walczak B.
Zeszyty Problemowe Postępów Nauk Rolniczych
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1996
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tom 436
EN
This work presents the results of research on the influence of aggregate structure of the arable layer of rendzina in shaping its hydrophysical characteristics, i.e: - the ability of retaining water in the process of drying and wetting, water conductivity in the saturated and unsaturated zones; and the ability of returning water to the atmosphere. A close interdependence between the dimensions of rendzina aggregates, and all the above mentioned hydrophysical characteristics, was noted in the present research.
PL
W pracy przedstawiono wyniki badań wpływu budowy agregatowej warstwy ornej rędziny na kształtowanie się jej hydrofizycznych charakterystyk, tj. zdolność do retencjonowania wody w procesie osuszania i nawilżania, przewodnictwo wodne w strefie nasyconej i nienasyconej oraz zdolność gleby do oddawania wody atmosferze. Stwierdzono ścisłe zależności pomiędzy wielkością agregatów rędziny a wszystkimi w. w. charakterystykami hydrofizycznymi.
4
Content available A comparison of three microaggregation indices with other tests of structural stability
100%
Mbagwu J. S. C.
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tom 06
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nr 1-2
5
Content available Characterisation of soil aggregate stability by ultrasonic dispersion
100%
Mentler A. , Mayer H. , Strauss P. , Blum W. E. H.
International Agrophysics
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2004
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tom 18
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nr 1
6
Content available Microbiological activity within various fractions of soil aggregates
88%
Dabek-Szreniawska M. , Wilke B. M.
Zeszyty Problemowe Postępów Nauk Rolniczych
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1996
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tom 436
EN
The measurement of respiration activity of microorganisms in particular aggregate fractions for 3 soils was performed. And an attempt was made to determine the relation between the quantity of bacteria and fungi. The correlation between the size of aggregates and respiration activity of microorganisms was found out.
PL
Określano aktywność oddechową mikroorganizmów w poszczególnych frakcjach glebowych. 3 typy gleb poddano analizom: brunatną wytworzoną z lessu, brunatną wytworzoną z piasku i rendzinę. Równocześnie określano relacje między aktywnością oddechową bakterii i grzybów w agregatach glebowych i w glebie niefrakcjonowanej rędziny. Stwierdzono korelacje między wielkością agregatów, zawartością substancji organicznej, aktywnością oddechową i biomasą mikroorganizmów.
7
Content available Water vapour adsorption by soil aggregate fractions
88%
Kharitonova G. V. , Shein E. V. , Vityazev V. G. , Lapekina C. I.
International Agrophysics
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2005
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tom 19
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nr 1
8
Content available The effect of soil particles aggregation on ion adsorption
88%
Usiarow O. G. , Stawinski J. , Jozefaciuk G. , Swieboda R.
|
|
nr 4
9
Content available The effect of crop rotation on the stability of soil aggregate
88%
Kesik T.
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1994
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tom 08
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nr 1
10
Content available Evaporation from aggregates of a podzolic, a light brown and a chernozem soil
88%
Witkowska-Walczak B.
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1995
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tom 09
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nr 1
11
Hydrophysical characteristics of aggregates: Orthic Podzol, Eutric Cambisol, and Orthic Luvisol. Part II. Water retention curves
88%
Witkowska-Walczak b.
Polish Journal of Soil Science
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1997
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tom 30
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nr 2
12
Content available Use of simplex algorythm for determination of soil aggregation extreme changes
88%
Niewczas J. , Witkowska-Walczak B.
International Agrophysics
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2003
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tom 17
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nr 4
13
Content available Distribution of carbohydrate pools within water-stable aggregates of an Ultisol in Southern Nigeria
88%
Adesodun J. K. , Mbagwu J. S. C. , Oti N.
International Agrophysics
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2004
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tom 18
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nr 2
14
Water conductivity of mineral-moorsh soil aggregates
75%
Witkowska-Walczak B.
Polish Journal of Soil Science
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2005
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tom 38
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nr 1
1-10
EN
The paper presents the results of a study on the effect of the size of mineral-moorsh soil aggregates on water conductivity in the saturated and unsaturated zone. It was found that water conductivity coefficients in the saturated zone of mineral-moorsh soil increase with the size of aggregates. The water conductivity coefficients in the unsaturated zone decrease with the size of aggregates from 0.9 10² cm day⁻¹ at pF 0.4 to 0.3 10⁻⁵ cm day⁻¹ for pF 4.2 for aggregates less than 0.25 mm, and for aggregates of 5-10 mm – from 4 cm day⁻¹ at pF 0.4 to 0.8 10⁻⁹ at pF 4.2. Water conductivity coefficients in the unsaturated zone increase with increasing water content and this increase is especially notable between 8 and 22% vol. and above 40% vol. of moisture for all investigated aggregates.
PL
Przedstawiono wyniki badań wpływu wielkości agregatów gleby mineralno-murszowej na przewodnictwo wodne w strefie nasyconej i nienasyconej. Stwierdzono, że współczynniki przewodnictwa wodnego w strefie nasyconej gleby mineralno-murszowej wzrastają wraz ze wzrostem wielkości agregatów, podczas gdy w strefie nienasyconej zmniejszają się z 0.9 10² cm doba⁻¹ przy pF 0.4 do 0.3 10⁻⁵ cm doba⁻¹ przy pF 4.2 dla agregatów mniejszych od 0.25 mm, a dla agregatów frakcji 5-10 mm – z 4 cm doba⁻¹ przy pF 0.4 do 0.8 10⁻⁹ przy pF 4.2. Nienasycone przewodnictwo wodne wzrasta wraz ze wzrostem wilgotności, a wzrost ten jest szczególnie widoczny pomiędzy 8 a 22% oraz powyżej 40% wilgotności dla wszystkich badanych frakcji agregatów.
15
Content available Quicklime application instantly increases soil aggregate stability
75%
Keiblinger K. M. , Bauer L. M. , Deltedesco E. , Holawe F. , Unterfrauner H. , Zehetner F. , Peticzka R.
International Agrophysics
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2016
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tom 30
|
nr 1
16
Content available Effect of organic inputs on strength and stability of soil aggregates under rice-wheat rotation
75%
Das B. , Chakraborty D. , Singh V. K. , Aggarwal P. , Singh R. , Dwivedi B. S.
International Agrophysics
|
2014
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tom 28
|
nr 2
EN
The study aims to elucidate the impact of organic inputs on strength and structural stability of aggregates in a sandy loam soil. Tensile strength, friability and water stability of aggregates, and the carbon contents in bulk soil and in large macro (>2 mm), small macro (0.25-2 mm), micro (0.053-0.25 mm) and silt+clay size (<0.053) aggregates were evaluated in soils from a long-term experiment with rice-wheat rotation at Modipuram, India, with different sources and amounts of organic C inputs as partial substitution of N fertilizer. Addition of organic substrates significantly improved soil organic C contents, but the type and source of inputs had different impacts. Tensile strength of aggregates decreased and friability increased through organic inputs, with a maximum effect under green gram residue (rice)-farmyard manure (wheat) substitution. Higher macroaggregates in the crop residue- and farmyard manure-treated soils resulted in a higher aggregate mean weight diameter, which also had higher soil organic C contents. The bulk soil organic C had a strong relation with the mean weight diameter of aggregates, but the soil organic C content in all aggregate fractions was not necessarily effective for aggregate stability. The soil organic C content in large macroaggregates (2-8 mm) had a significant positive effect on aggregate stability, although a reverse effect was observed for aggregates <0.25 mm. Partial substitution of nitrogen by organic substrates improved aggregate properties and the soil organic C content in bulk soil and aggregate fractions, although the relative effect varied with the source and amount of the organic inputs.
17
Content available Influence of vibration amplitude on the ultrasonic dispersion of soils
75%
Mayer H. , Mentler A. , Papakyriacou M. , Rampazzo N. , Marxer Y. , Blum W. E. H.
International Agrophysics
|
2002
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tom 16
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nr 1
18
Content available Effect of soil acidification on the formation of Fe-, Al-, and Mn-oxides and the stability of soil aggregates
75%
Rampazzo N. , Schwertmann U. , Blum W. E. H. , Mentler A.
International Agrophysics
|
1999
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tom 13
|
nr 3
19
Content available Hydrophysical characteristics and evaporation of Haplic Luvisol and Mollic Gleysol aggregates
75%
Witkowska-Walczak B.
International Agrophysics
|
2003
|
tom 17
|
nr 3
20
Content available Influence of aggregate size of Eutric Cambisol and Gleyic Phaeozem on evaporation
75%
Witkowska-Walczak B.
International Agrophysics
|
2000
|
tom 14
|
nr 4
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