Organic Matter Influence on Clay Wettability and Soil Aggregate Stability

Chenu, Claire; Bissonnais, Yves Le; Arrouays, Dominique

doi:10.2136/sssaj2000.6441479x

Cited by 662 publications

(388 citation statements)

References 31 publications

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“…Such levels are key in short and long-term soil fertility restoration in areas with negative nutrient balances. There have been efforts to explore SOC threshold levels, but in the context of desirable soil properties and the inherent nutrient supply for crops (Six, Elliott & Paustian, 2000;Chenu, Bissonnais, & Arrouays, 2000;Loveland & Webb, 2003). In this piece of work, therefore, we consider the concepts and prospects of SOC thresholds and N management.…”

Section: Introductionmentioning

confidence: 99%

Soil Organic Carbon Thresholds and Nitrogen Management in Tropical Agroecosystems: Concepts and Prospects

Mazellier¹,

Tenywa²,

Ebanyat³

et al. 2013

JSD

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Soil organic carbon (SOC) is a potential soil fertility indicator for regulating nitrogen application in tropical farming systems. However, there are limited studies that have discussed SOC thresholds above or below which crop production could be diminished, or at which no or high response to nitrogen (N) application can be realized. This review explores the drivers of SOC concentration relevant for the establishment of thresholds. We further evaluate existing SOC thresholds for provoking no yield response or significant response to added N fertilizer. Key drivers for SOC concentration relevant in establishing thresholds are mainly climate, topography, texture, and land use management. Soil organic carbon threshold for sustaining soil quality is widely suggested to be about 2% below which deterioration may occur. For added N fertilizer management, specific SOC thresholds seem quite complex and are only valid after assuming other factors are non-limiting. In some soils, SOC levels as low as 0.5% result in fertilizer responses and soils as high as 2% SOC also respond to small N doses. Minimum SOC thresholds can be identified for a given soil type, but maximum thresholds depend on crop N requirements, crop N use efficiency and amount of N applied. However, there seem to exist critical total SOC ranges that could be targeted for optimal indigenous N supply and integrative soil functional benefits. These can be targeted as minimum levels in soil fertility restoration. In all, it is still difficult to establish a single minimum or maximum SOC threshold value that can be universally or regionally accepted.

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Section: Introductionmentioning

confidence: 99%

Soil Organic Carbon Thresholds and Nitrogen Management in Tropical Agroecosystems: Concepts and Prospects

Mazellier¹,

Tenywa²,

Ebanyat³

et al. 2013

JSD

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“…Soil organic matter is assumed to stabilize aggregates against disruptive processes such as slaking, by increasing the cohesion of aggregates through the binding of mineral particles by organic polymers. It could also decrease the wettability of aggregates, thus reducing their rates of wetting and the extent of slaking [12]. Organic substances are very repellent to water and several organic fractions are responsible for this hydrophobicity of soils, e.g.…”

Section: Introductionmentioning

confidence: 99%

Influence of some physicochemical and biological parameters on soil structure formation in alluvial soils

Bullinger-Weber

Bayon

Guénat

et al. 2007

European Journal of Soil Biology

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This study examines the role of abiotic (texture, calcium carbonates or iron) and biotic parameters (earthworm and enchytraeid activities) on the initial phases of soil aggregation. Our research focused on humus forms in alluvial soils, which are considered as young and heterogeneous environments. We hypothesized that the soil structure formation is determined by both the nature of the recent alluvial deposits and the soil fauna. For this purpose, six sites were chosen throughout two types of softwood forests (willow and alder forest) representing two stages of vegetation succession. Evidence of soil texture influence on aggregate stability was observed. A dominance of a coarse sand fraction caused a quick colonization of enchytraeids and epigeic earthworms while a silty texture favoured the presence of anecic earthworms, thus increasing the aggregate stabilisation. Iron forms, acting as cementing agents, were observed in the coarse silt, while calcium carbonates were equally distributed among the textural fractions. Active calcium carbonate fraction, binding organic matter with mineral components, was not found in the coarse sand fraction. In conclusion, the tree age cannot alone be used as an indicator of the humus form evolution but biological and physicochemical parameters also influence the initial steps of soil structuration.

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“…polyphenols) and synthetic origin (e.g. herbicides and pesticides) (Chenu et al, 2000;Gardner et al, 1999). …”

Section: Composting Practices and Soil Organic Matter Increasementioning

confidence: 99%

Humusica 2, article 16: Techno humus systems and recycling of waste

Zanella

Ponge

Guercini

et al. 2018

Applied Soil Ecology

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Techno humus systems correspond to man-made topsoils under prominent man influence. They may be purposely\ud conceived for supporting agricultural activities or dumping of waste products, sometimes abandoned to\ud an unknown evolution. Both categories needed a more scientific frame. This is the reason we classified them as\ud morpho-functional humus systems. Improving agricultural soils with organic waste products is an ancestral\ud practice. We present four examples of techno humus systems purposely created for supporting plant growth.\ud Considering a simple home-made composting pile, we give a few basic notions about the biological functioning\ud of these artificial humus systems. Humipedon functioning and structuration are similar to those observed in\ud natural humus systems. Using even animal manure, we illustrate how to manage larger compost piles of waste\ud for application in farming areas. Composting waste that contains animal proteins needs a more careful measurement\ud of the temperature of the pile and a longer period of elevated temperature in the core of the pile.\ud Mulching of pruning residues is presented in a large urban context. The use of mulch must take into account\ud quality and composition of woody material. The lack of nutrients in some residues has to be compensated by a\ud moderate use of appropriate mineral fertilizers. Municipal solid waste, anaerobic digestion residues (grape remains)\ud and spent mushroom compost, eventually mixed with mineral fertilizers, have been tested in horticulture.\ud Benefits and drawbacks are listed for each experiment, with the evolution of carbon storage along 8\ud years of horticultural practice. Finally, we present an example of “dump” humus system. Mine tailing wastes\ud represent a huge problem in many countries. Pointing on their microbial activity, we show that they must be\ud seen as manageable living humipedons, not as piles of inert rocky material

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Organic Matter Influence on Clay Wettability and Soil Aggregate Stability

Cited by 662 publications

References 31 publications

Soil Organic Carbon Thresholds and Nitrogen Management in Tropical Agroecosystems: Concepts and Prospects

Soil Organic Carbon Thresholds and Nitrogen Management in Tropical Agroecosystems: Concepts and Prospects

Influence of some physicochemical and biological parameters on soil structure formation in alluvial soils

Humusica 2, article 16: Techno humus systems and recycling of waste

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