Estimation of the density of the clay-organic complex in soil

Czyż, Ewa A.; Dexter, A. R.

doi:10.1515/intag-2015-0075

Cited by 9 publications

(8 citation statements)

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“…They found that soil clay had a critical role in the chemical stabilisation of organic matter through clay-organic complexes in the soils. Czyz and Dexter (2016) pointed out the relation between the magnitude of clay-soil Figure 1. The effect of number of passes on penetration resistance at different depths (passing × depth × treatment).…”

Section: Soil Penetration Resistancementioning

confidence: 99%

Cooperative effects of field traffic and organic matter treatments on some compaction-related soil properties

et al. 2017

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Abstract. Soil compaction is a common problem of mineral soils under conventional tillage practices. Organic matter addition is an efficient way of reducing the effects of field traffic in soil compaction. The aim of this study was to investigate the effects of number of tractor passes (one, three, and five) on depth-dependent (0-10 and 10-20 cm) penetration resistance, bulk density, and porosity of clay-textured soil (Typic Xerofluvent) under organic vegetable cultivation practices in the 2010-2013 growing seasons. Fields were treated with farmyard manure (FYM, 35 t ha −1 ), green manure (GM; common vetch, Vicia sativa L.), and conventional tillage (CT). The number of tractor passes resulted in increases in bulk density and penetration resistance (CT > GM > FYM), whereas the volume of total and macropores decreased. The maximum penetration resistance (3.60 MPa) was recorded in the CT treatment with five passes at 0-10 cm depth, whereas the minimum (1.64 MPa) was observed for the FYM treatment with one pass at 10-20 cm depth. The highest bulk density was determined as 1.61 g cm −3 for the CT treatment with five passes at 10-20 cm depth; the smallest value was 1.25 g cm −3 in the FYM treatment with only one pass at 0-10 cm depth. The highest total and macropore volumes were determined as 0.53 and 0.16 cm 3 cm −3 respectively at 0-10 cm depth for the FYM treatment with one pass. The volume of micropores (0.38 cm 3 cm −3 ) was higher at 0-10 cm depth for the FYM treatment with three passes. It can be concluded that organic pre-composted organic amendment rather than green manure is likely to be more efficient in mitigating compaction problems in soil.

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Section: Soil Penetration Resistancementioning

confidence: 99%

Cooperative effects of field traffic and organic matter treatments on some compaction-related soil properties

et al. 2017

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“…The clay-organic complex in soil has been found to have a very small effective mean density of 170±40 kg m -3 (Czyż and Dexter, 2016). This is a smaller density than that of any other component of soil or of the whole soil.…”

Section: Introductionmentioning

confidence: 92%

Clay-organic complexes in a Polish loess soil

Czyż¹,

Rejman²,

Dexter³

et al. 2017

International Agrophysics

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Complexes formed between clay and soil organic matter are important for carbon sequestration and for soil physical quality. Here, we use samples of loessial soil from South-East Poland to explore the phenomenon of complexing in loess. Soil samples were collected from a single catchment 8 years after the introduction of strip tillage and their compositions were characterized by traditional methods. Complexing was characterized in terms of the content of non-complexed clay which was estimated in two ways: firstly, by measurement of the content of readily-dispersible clay (which was assumed to be the non-complexed clay); and secondly, by calculation using algorithms that had been developed and evaluated previously. The calculations were based on the concept that, at carbon saturation, the clay/organic carbon mass ratio is equal ton. The calculations were done with a range of values ofn. It was assumed that the correct value ofnwas that which gave the greatest coefficient of correlation between the measured values of clay dispersion and the predicted values of non-complexed clay. For the loess used, the optimum value wasn= 14.

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“…Low to high values of COCC represent an increasing fraction of SOC complexed with clay and increasingly porous soil structure (sensu Dexter et al, 2008;Czyż and Dexter, 2016). Values of COCC refer to the mass fraction of complexable material (i.e., clay and SOC) predicted to be in organo-mineral complexes.…”

Section: Datasetsmentioning

confidence: 99%