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Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

100%

Ajayi A. E., Horn R.

International Agrophysics

|

2016

|

tom 30

|

nr 4

Changing climate is threatening rainfall regularity particularly in the semi-arid and arid regions; therefore, strategies to conserve water within their coarse-grained soils and to improve water use efficiency of crops are critical. This study compared the effectiveness of biochar and two types of clay materials in augmenting water retention and improving mechanical resilience of fine sand. The amendment of fine sand with woodchip-biochar and kaolinite (non-swelling clay) and Na-bentonite (swelling clay) improved the water retention capacity and interparticle bonding of the substrate depending of the rate of amendment and water content of the substrates. Na-bentonite was more effective at increasing water retention capacity at more negative matric potentials. Biochar was more effective at saturation due to the increased porosity, while kaolinite responds similarly to biochar. It is, however, shown that most of the water retained by the Na-betonite may not be available to plants, particularly at high amendment rate. Furthermore, the clay and biochar materials improved particle bonding in the fine sand with the Na-bentonite being more effective than biochar and kaolinite (in that order) in strengthening interparticle bonds and improving the resilience of fine sand, if the rate of amendment is kept at ≤50 g kg-1.

2

Effect of biochar on the unsaturated hydraulic conductivity of two amended soils

100%

Villagra-Mendoza K., Horn R.

International Agrophysics

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2018

|

tom 32

|

nr 3

3

Modification of mineral liner to improve its long-term stability

100%

Horn R., Stepniewski W.

International Agrophysics

|

2004

|

tom 18

|

nr 4

4

Strength regain in soil aggregate beds by swelling and shrinkage

100%

Seguel O., Horn R.

International Agrophysics

|

2006

|

tom 20

|

nr 2

5

Changes in soil organic matter, bulk density and tensile strength of aggregates after percolation in soils after conservation and conventional tillage

100%

Urbanek E., Horn R.

International Agrophysics

|

2006

|

tom 20

|

nr 3

6

Quantity of hydrophobic functional CH-groups - decisive for soil water repellency caused by digestate amendment

81%

Voelkner A., Holthusen D., Ellerbrock R. H., Horn R.

International Agrophysics

|

2015

|

tom 29

|

nr 2

Anaerobic digestates are used as organic fertilizers; however, they are suspected to interfere negatively with soils.To investigate the relevance of the anaerobic digestates composition on potential wettability and contact angle of the soil, we mixed in a laboratory experiment 30 m³ ha-1 of anaerobic digesta-tes derived from mechanically pre-treated substrates from maizeand sugar beet with a homogenized Cambic Luvisol. Fourier trans-form infrared-spectra and diffuse reflectance infrared Fouriertransform-spectra of particle intact and finely ground soil-anaerobic digestates-mixtures were analyzed to determine the quantities of hydrophobic functional groups in the soil-anaerobic digestates-mixtures that are used here as an indicator for the potential hydrophobicity. The anaerobic digestates application increased the amount of hydrophobic functional groups of the mixtures and reduced the wettability of the soil. However, for intact particle samples an up to threefold higher amount of hydrophobic groups was found as compared to the finely ground ones, indicating a dilution effect of mechanical grinding on the effectivity of the organic matter that is presumably located as a coating on mineral soil particles. For the particle intact samples, the intensity of hydrophobic functional groups bands denoting hydrophobic brickstones in organic matter is indicative for the actual wettability of the soil-anaerobic digestates-mixtures.

7

Swelling-shrinkage properties and hydraulic conductivity of a compacted coal mine tailing rock likely to be used for landfill capping

81%

Wysocka A., Stepniewski W., Horn R.

International Agrophysics

|

2007

|

tom 21

|

nr 4

405-408

8

Modelling the effects of repeated wheel loads on soil profiles

80%

Richards B. G., Baumgartl T., Horn R., Grasle W.

International Agrophysics

|

1997

|

tom 11

|

nr 3

9

Soil tensile strength as affected by time, water content and bulk density

80%

Blazejczak D., Horn R., Pytka J.

International Agrophysics

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1995

|

tom 09

|

nr 3

10

Effect of management of a volcanic ash soil on structural properties

80%

Ellies A., Horn R., Smith R.

International Agrophysics

|

2000

|

tom 14

|

nr 4

11

Shrinkage properties of three clay materials at different temperatures

80%

Wysocka A., Stepniewski W., Horn R.

International Agrophysics

|

2006

|

tom 20

|

nr 3

12

Oxygen concentration in primary roots of broadbean, lupin and pea seedling as measured with a microelectrode

80%

Stepniewski W., Zausig J., Przywara G., Horn R.

International Agrophysics

|

1998

|

tom 12

|

nr 2

13

Elastic and plastic soil deformation and its influence on emission of greenhouse gases

71%

Haas C., Holthusen D., Mordhorst A., Lipiec J., Horn R.

International Agrophysics

|

2016

|

tom 30

|

nr 2

14

Surface shear resistance of soil on the micro- to mesoscale

71%

Wojciga A., Bolte K., Horn R., Stepniewski W., Bajuk E.

International Agrophysics

|

2009

|

tom 23

|

nr 4

391-398

15

Denitrification rate and microbial distribution within homogeneous model soil aggregates

71%

Horn R., Stepniewski W., Wlodarczyk T., Walenzik G., Eckhardt F. E. W.

International Agrophysics

|

1994

|

tom 08

|

nr 1

16

Soil stress state determination under static load

71%

Pytka J., Horn R., Kuhner S., Semmel H., Blazejczak D.

International Agrophysics

|

1995

|

tom 09

|

nr 3

17

Subsoil compaction of a clay soil in South-East Norway and its amelioration after 5 years

61%

Seehusen T., Mordhorst A., Riggert R., Fleige H., Horn R., Riley H.

International Agrophysics

|

2021

|

tom 35

|

nr 2

18

Shrink-swell potential, hydraulic conductivity and geotechnical properties of clay materials for landfill liner construction

61%

Widomski M. K., Stepniewski W., Horn R., Bieganowski A., Gazda L., Franus M., Pawlowska M.

International Agrophysics

|

2015

|

tom 29

|

nr 3

19

Soil mechanical properties of a partly-reloosened [split plough system] and a conventionally-tilled overconsolidated gleyic luvisol derived from glacial till

61%

Horn R., Kretschmer H., Baumgartl T., Bohne K., Neupert A., Dexter A. R.

International Agrophysics

|

1998

|

tom 12

|

nr 3

Ograniczanie wyników

Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

Effect of biochar on the unsaturated hydraulic conductivity of two amended soils

Modification of mineral liner to improve its long-term stability

Strength regain in soil aggregate beds by swelling and shrinkage

Changes in soil organic matter, bulk density and tensile strength of aggregates after percolation in soils after conservation and conventional tillage

Quantity of hydrophobic functional CH-groups - decisive for soil water repellency caused by digestate amendment

Swelling-shrinkage properties and hydraulic conductivity of a compacted coal mine tailing rock likely to be used for landfill capping

Modelling the effects of repeated wheel loads on soil profiles

Soil tensile strength as affected by time, water content and bulk density

Effect of management of a volcanic ash soil on structural properties

Shrinkage properties of three clay materials at different temperatures

Oxygen concentration in primary roots of broadbean, lupin and pea seedling as measured with a microelectrode

Elastic and plastic soil deformation and its influence on emission of greenhouse gases

Surface shear resistance of soil on the micro- to mesoscale

Denitrification rate and microbial distribution within homogeneous model soil aggregates

Soil stress state determination under static load

Subsoil compaction of a clay soil in South-East Norway and its amelioration after 5 years

Shrink-swell potential, hydraulic conductivity and geotechnical properties of clay materials for landfill liner construction

Soil mechanical properties of a partly-reloosened [split plough system] and a conventionally-tilled overconsolidated gleyic luvisol derived from glacial till