Influence of Stability and Origin of Organic Amendments on Humification in Semiarid Soils

Jindo, Keiji; Hernández, Teresa; Garcı́a, Carlos; Sánchez-Monedero, Miguel Á.

doi:10.2136/sssaj2011.0094

Cited by 30 publications

(29 citation statements)

References 47 publications

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“…The C/N ratios of humic acid‐like fractions present in organic amendments are typically smaller than those of native soil humic acids, indicative of lower humification degree . Thus, consistently with previous studies on similar systems , our results suggest a partial incorporation of simple and low humified components into the humic acid pools of the amended soils.…”

Section: Resultssupporting

confidence: 90%

“…and , respectively. As found in other studies , the mineral‐associated OM is the most abundant organic C pool, constituting 65% of the total soil organic C in UN, 53% in SC, 52% in MC, and 44% in TS; similarly, the mineral‐associated OM fraction accounts for the greatest proportion of the total N in the soils examined, with contributions of 68% in UN, 60% in SC, 54% in MC, and 48% in TS.…”

Section: Resultssupporting

confidence: 83%

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Short‐Term Stabilization of Organic Matter in Physically, Chemically, and Biochemically Protected Pools in Soils Amended with Municipal Wastes

Fernández

López‐de‐Sá

Polo

et al. 2013

CLEAN Soil Air Water

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Increased understanding of the stabilization mechanisms of the organic matter (OM) entering the soil system through the application of organic amendments is of paramount agronomic and environmental importance. Here, we examined the organic C and total N distribution in OM pools (i.e. free, intra-macroaggregate, intramicroaggregate, mineral-associated, dissolved, and humic acid fractions) characterized by different protection mechanisms in soils annually amended with different organic substrates of municipal origin (i.e. municipal solid waste compost, sewage sludge compost, and thermally dried sewage sludge) for three years. With respect to the unamended control soil, the application of the three organic materials, especially thermally dried sewage sludge, increased soil organic C, and total N contents. The organic inputs accumulated mostly in the physically unprotected free OM pool, as relatively fresh, low humified materials, and secondarily in the intra-macroaggregate fraction, as partially decomposed OM weakly protected by physical mechanisms. Our results suggest that mechanisms related to strong physical protection in microaggregates and chemical inaccessibility by intimate association with minerals do not govern OM stabilization in the short term.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 83%

Short‐Term Stabilization of Organic Matter in Physically, Chemically, and Biochemically Protected Pools in Soils Amended with Municipal Wastes

Fernández

López‐de‐Sá

Polo

et al. 2013

CLEAN Soil Air Water

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“…However, the HA extracted from PM+B had lower H:C ratio than that from PM, reflecting the higher levels of aromatic compounds formed by composting and illustrates a higher degree of humification [33][34][35]. This is in accordance with the result of W 2 /W 1 ratio, known as thermal stability indicator of humic structures [29], showing 38% and 40% higher in HA and FA of PM+B, respectively, compared to those of PM. These results imply that more stable chemical structure was formed with the biochar presence [36].…”

Section: Statistic Analysissupporting

confidence: 79%

“…A full description of the extraction method is written in a previous study [29]. In short, the extraction of the humic substances was carried out with 10 g of mature compost samples and 100 mL of 0.25 M NaOH, under an atmosphere of N 2 .…”

Section: Extraction Of Ha and Fa From The Composted Materials (Pm Andmentioning

confidence: 99%

The Efficiency of a Low Dose of Biochar in Enhancing the Aromaticity of Humic-Like Substance Extracted from Poultry Manure Compost

et al. 2019

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Using biochar as a bulking agent in composting is gradually becoming popular for the minimization of nitrogen losses during the process and the improvement in compost quality. While a wide range of different biochar doses is applied, not much clear information was available about the optimum ratio. This study presents the impact of adding a low dose (2% v/v) of slow-pyrolysis oak biochar (Quercus serrate Murray), into poultry manure on the recalcitrant characteristic of humified organic matter. The influence in the chemical composition of humic-like substance was evaluated in poultry manure compost prepared with (PM+B) and without biochar (PM). The shift to slightly more stable chemical composition was shown in humic acid-like (HA) and fulvic acid-like (FA) extracted from PM+B compost, by increasing the proportion of aromatic carbon groups and thermal stability measured by thermogravimetry. We conclude that the addition of 2% biochar moderately enhances the recalcitrance of humified organic carbon and this could be feasible for the implementation of the biochar use in composting since only a small amount is required.

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“…1), others have reported similar pore morphology and distributions for various types of lignites as wood biochars (Wildman and Derbyshire 1991;Schobert 1995). Both biochar and humalite are known to exhibit varying degrees of hydrophobicity prior to surface oxidation (Piccolo et al 2003;Borchard et al 2012), and hydrophobic protection has been proposed as another mechanism for the stabilization of LOM C (Spaccini et al 2002;Jindo et al 2011).…”

Section: Properties Of Soils and Organic Amendmentsmentioning

confidence: 99%

Use of biochar and oxidized lignite for reconstructing functioning agronomic topsoil: Effects on soil properties in a greenhouse study

Bekele

Roy²,

Young

2015

Can. J. Soil. Sci.

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Bekele, A., Roy, J. L. and Young, M. A. 2015. Use of biochar and oxidized lignite for reconstructing functioning agronomic topsoil: Effects on soil properties in a greenhouse study. Can. J. Soil Sci. 95: 269–285. Interest in the use of biochar as soil amendment has grown recently. However, studies evaluating its potential use for reclamation of disturbed agricultural lands are lacking. We studied the effects of amending clay, loam, and sand subsoil substrates with wood biochar pyrolized at 800°C, oxidized lignite (humalite), or labile organic mix (sawdust, wheat straw, and alfalfa; LOM) on soil organic carbon (C), microbial biomass, dry aggregated size distribution and penetration resistance in greenhouse. We also considered the co-application of LOM and biochar or humalite to the subsoil substrates as treatments where C from either biochar or humalite represented a stable form of C. The amount and composition of the mix of organic amendments was determined for each subsoil so that organic C levels of reconstructed topsoil would be equivalent to that of the corresponding native topsoil in the long term. Field pea (Pisum sativum L.) and barley (Hordeum vulgare L.) were grown in rotation in four sequential greenhouse studies. Results from soil analysis at the end of study II and study IV showed that subsoils amended with biochar or humalite had higher organic C than those with LOM only, regardless of soil type. Labile organic mix added alone or together with biochar or humalite to subsoil increased microbial biomass and decreased geometric mean diameter of the dry soil aggregates. The effects of biochar or humalite-only amendment on these soil properties were not significant relative to the unamended subsoil substrate. Simultaneous application of biochar or humalite with LOM can potentially be used for topsoil reconstruction and reclamation of disturbed agricultural lands, and to maintain soil quality in the long term. However, long-term field studies are required to ascertain the longevity of the desirable properties reported in this study and to assess effects associated with aging of biochar or humalite in the soil.

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Influence of Stability and Origin of Organic Amendments on Humification in Semiarid Soils

Cited by 30 publications

References 47 publications

Short‐Term Stabilization of Organic Matter in Physically, Chemically, and Biochemically Protected Pools in Soils Amended with Municipal Wastes

Short‐Term Stabilization of Organic Matter in Physically, Chemically, and Biochemically Protected Pools in Soils Amended with Municipal Wastes

The Efficiency of a Low Dose of Biochar in Enhancing the Aromaticity of Humic-Like Substance Extracted from Poultry Manure Compost

Use of biochar and oxidized lignite for reconstructing functioning agronomic topsoil: Effects on soil properties in a greenhouse study

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