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Registros recuperados: 16
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Basal organic phosphorus mineralization in soils under different farming systems Organic Eprints
Oehl, F.; Frossard, E.; Fliessbach, A.; Dubois, D.; Oberson, A..
Soil organic P (Po) mineralization plays an important role in soil P cycling. Quantitative information on the release of available inorganic P (Pi) by this process is difficult to obtain because any mineralized Pi gets rapidly sorbed. We applied a new approach to quantify basal soil Po mineralization, based on 33PO4 isotopic dilution during 10 days of incubation, in soils differing in microbiological activity. The soils originated from a 20 years old field experiment, including a conventional system receiving exclusively mineral fertilizers (MIN), a bioorganic (ORG) and bio-dynamic (DYN) system. Indicators of soil microbiological activity, such as size and activity of the soil microbial biomass and phosphatase activity, were highest in DYN and lowest in...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Soil biology; Soil quality.
Ano: 2004 URL: http://orgprints.org/2791/1/Oehl_et_al_2004_SBB_36.pdf
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Competition and facilitation in synthetic communities of arbuscular mycorrhizal fungi Organic Eprints
Thonar, C.; Frossard, E.; Šmilauer, P.; Jansa, J..
Interactions between arbuscular mycorrhizal fungal (AMF) species cocolonizing the same host plant are still little understood in spite of major ecological significance of mycorrhizal symbiosis and widespread occurrence of these fungi in communities rather than alone. Furthermore, shifting the composition of AMF communities has demonstrated consequences for the provision of symbiotic benefits to the host as well as for the qualities of ecosystem services. Therefore, here we addressed the nature and strength of interactions between three different AMF species in all possible two-species combinations on a gradient of inoculation densities. Fungal communities were established in pots with Medicago truncatula plants, and their composition was assessed with...
Tipo: Journal paper Palavras-chave: Soil.
Ano: 2014 URL: http://orgprints.org/26019/1/Thonar_etal_2014_ArbMycorrFungi.pdf
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Fertilization of Dioscorea rotundata with poultry manure: effects on nutrient dynamics and nutrient use efficiencies Organic Eprints
Andres, C.; NGuessan Diby, L.; Kouamé Hgaza, V.; Frossard, E..
Similar effects of poultry manure (PM) and mineral fertilizer suggest that PM is a cheap and effective alternative to fertilizers for yam production!
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover.
Ano: 2012 URL: http://orgprints.org/25174/1/andreas-etal-2012-fertilization_Dioscorea-rotundata_Poster_SGPW.pdf
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Fertilization of Dioscorea rotundata with poultry manure: effects on nutrient dynamics and nutrient use efficiencies. Awarded poster presentation Organic Eprints
Andres, C.; NGuessan Diby, L.; Kouamé Hgaza, V.; Frossard, E..
Similar effects of poultry manure (PM) and mineral fertilizer suggest that PM is a cheap and effective alternative to fertilizers for yam production!
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover.
Ano: 2012 URL: http://orgprints.org/25219/1/andres-etal-2011-awarded-poster-ETH.pdf
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Green manure and long-term fertilization effects on available soil zinc and cadmium and their accumulation by wheat (Triticum aestivum L.) Organic Eprints
Grüter, Roman; Costerousse, B.; Bertoni, A.; Mayer, J.; Thonar, C.; Frossard, E.; Schulin, R.; Tandy, S..
Zinc (Zn) deficiency in humans due to imbalanced diets is a global nutritional problem. It is especially widespread in populations of low-income countries depending on cereals as staple food. Grain Zn concentrations are particularly low in cereals grown on soils with low phytoavailable Zn concentrations. . Plant Zn uptake depends on soil properties such as pH, calcium carbonate, iron and manganese oxides, total Zn and organic matter content (OM). Soil pH, total Zn and OM can be influenced on farms with limited access to mineral fertilizers through organic matter management practises. In this study, we investigated to what extent green manure application could increase soil Zn availability and wheat grain Zn concentrations (biofortification) on soil with...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil quality Food security; Food quality and human health Cereals; Pulses and oilseeds.
Ano: 2017 URL: http://orgprints.org/31306/1/grueter-etal-2017-ssss-anual-meeting-february-bern.pdf
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Incorporation of Nitrogen-15-Labeled Amendments into Physically Separated Soil Organic Matter Fractions Organic Eprints
Bosshard, C.; Frossard, E.; Dubois, D.; Mäder, P.; Manolov, I.; Oberson, A..
Physically separated soil organic matter (SOM) fractions may take different functions in soil N dynamics. We studied the effect of long-term organic matter (OM) management and different soil biological activity on the incorporation of N added with organic and mineral amendments into aggregate fractions and size density fractions. We applied 15N-labeled sheep feces, urine, and mineral fertilizer to microplots installed in plots of conventional (CONMIN) and bio-organic (BIOORG) cropping systems. Soil sampled 112 d after amendment was separated into macro-, microaggregates, and microstructures. Aggregates were then fractionated into free light fraction (LF), intra-aggregate particulate organic matter (iPOM),and the mineral-associated organic matter fraction...
Tipo: Journal paper Palavras-chave: Soil.
Ano: 2008 URL: http://orgprints.org/26387/1/Bosshard_et_al_2008_SSSAJ_72_POM.pdf
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Is the enzymatic hydrolysis of soil organic phosphorus compounds limited by enzyme or substrate availability? Organic Eprints
Jarosch, K. A.; Kandeler, E.; Frossard, E.; Bünemann, E. K..
The mineralization of soil organic phosphorus (P) is catalysed by extracellular phosphatases that hydrolyse different non-phytate phosphomonoesters (e.g., sugar phosphates and nucleotides), inositol phosphates (e.g., phytic acids), and phosphodiesters (e.g., nucleic acids, phospholipids). The availabilities of both the organic P compound and the respective phosphatase enzyme jointly determine whether the hydrolysis reaction is substrate limited (enzyme availability > substrate availability) or enzyme limited (enzyme availability < substrate availability), with potential consequences for overall organic P composition and accumulation in soil. Our objective was to evaluate whether the hydrolysis of various organic P compounds in soil is limited by...
Tipo: Journal paper Palavras-chave: Soil quality.
Ano: 2019 URL: http://orgprints.org/36700/1/jarosch-etal-2019-SoilBiolBiochem-Vol139-107628-p1-11.pdf
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Nitrogen fixation and transfer in grassclover leys under organic and conventional cropping systems Organic Eprints
Oberson, A.; Frossard, E.; Bühlmann, C.; Mayer, J.; Mäder, P.; Lüscher, A..
Background and aim Symbiotic dinitrogen (N2) fixation is the most important external N source in organic systems. Our objective was to compare symbiotic N2 fixation of clover grown in organically and conventionally cropped grass-clover leys, while taking into account nutrient supply gradients. Methods We studied leys of a 30-year-old field experiment over 2 years in order to compare organic and conventional systems at two fertilization levels. Using 15N natural abundance methods, we determined the proportion of N derived from the atmosphere (PNdfa), the amount of Ndfa (ANdfa), and the transfer of clover N to grasses for both red clover (Trifolium pratense L.) and white clover (Trifolium repens L.). Results In all treatments and both years, PNdfa was...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Crop husbandry.
Ano: 2013 URL: http://orgprints.org/23228/1/Oberson-etal-2013-PlantansSoil-onlinefirst.pdf
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Nitrogen use efficiency of 15N-labelled sheep manure and mineral fertiliser applied to microplots in long-term organic and conventional cropping systems Organic Eprints
Bosshard, C.; Sørensen, P.; Frossard, E.; Mayer, J.; Mäder, P.; Nanzer, S.; Oberson, A..
Nitrogen (N) utilisation by crops has to be improved to minimize losses to the environment. We investigated N use efficiency of animal manure and mineral fertiliser and fate of fertiliser N not taken up by crops in a conventional (CONMIN) and a bioorganic (BIOORG) cropping system of a long-term field experiment over three vegetation periods (winter wheat–soybean–maize). Microplots planted with wheat received a single application of 15N-labelled slurries (either urine or faeces labelled) or mineral fertiliser. At the end of each vegetation period we tested whether higher microbial activity and larger microbial biomass in BIOORG than CONMIN soils, and lower long-term N input level in BIOORG, affected use efficiency and fate of fertiliser N not taken up by...
Tipo: Journal paper Palavras-chave: Soil.
Ano: 2009 URL: http://orgprints.org/26369/1/Bosshard_etal_2009_NCA83.pdf
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Phosphorus budget and phosphorus availability in soils under organic and conventional farming Organic Eprints
Oehl, F.; Oberson, A.; Tagmann, H.U.; Besson, J.M.; Dubois, D.; Mäder, P.; Roth, H.-R.; Frossard, E..
The aim of this work was to assess to which extent organic farming practices would affect the accumulation of total and available phosphorus (P) in a cropped soil in comparison to conventional practices. In order to achieve this, soil samples were taken from a long-term field trial comparing a non-fertilised control (NON), two conventionally cultivated treatments (MIN, CON), and two organically cultivated treatments (ORG, DYN). Soil samples were taken from each treatment at two depths (0-20 and 30-50 cm) before starting the field trial (1977) and at the end of every three crop rotations (1984, 1991 and 1998). They were then analysed for total P (Pt ), total inorganic P (Pi ), total organic P (Po) and isotopically exchangeable Pi . After 21 years, the...
Tipo: Journal paper Palavras-chave: Soil.
Ano: 2002 URL: http://orgprints.org/26761/1/Oehl_et_al_2002_NCA.pdf
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Phosphorus cycling within soil aggregate fractions of a highly weathered tropical soil: A conceptual model Organic Eprints
Garland, Gina; Bünemann, E. K.; Oberson, A.; Frossard, E.; Snapp, S.; Chikowo, R.; Six, J..
Effective use of soil phosphorus (P) for crop production requires an understanding of how P pools are stabilized and cycled within soil aggregates, rather than assuming that P dynamics, particularly organic P, closely follow those of C. The main goal of this study was to compare C and N cycling with P dynamics in soil aggregate fractions under two distinct crop species, maize (Zea mays) and pigeon pea (Cajanus cajan) in a highly-weathered Lixisol. We found that while C and N follow an open cycle, whereby C and N are mineralized from microaggregates during macroaggregate turnover and partially exit the soil system as gas and leachate, P has a relatively closed cycle, where most of the mineralized and solubilized P from microaggregates is lost from the...
Tipo: Journal paper Palavras-chave: Soil.
Ano: 2018 URL: http://orgprints.org/34709/1/garland-etal-2018-SoilBiolBiochem-Vol116-p91-98.pdf
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Plant-mediated rhizospheric interactions in maize-pigeon pea intercropping enhance soil aggregation and organic phosphorus storage Organic Eprints
Garland, Gina; Bünemann, E. K.; Oberson, A.; Frossard, E.; Six, J..
Background and aims In Malawi, strategies are being sought to boost maize production through improvements in soil fertility. This study assessed the impact of intercropping maize (Zea mays) with pigeon pea (Cajanus cajan) in Lixisols of Malawi on yield, biological N fixation, soil aggregation, and P forms within soil aggregates. Methods Maize and pigeon pea were grown intercropped in pots, with varying degrees of root interaction in order to understand the relative importance of biochemical versus physical rhizospheric interactions. Following harvest, soils were separated into aggregate fractions using wet-sieving, and the nutrient content of all fractions was assessed. Results The proportion of macroaggregates and microaggregates increased by 52 and...
Tipo: Journal paper Palavras-chave: Soil quality; Root crops.
Ano: 2017 URL: http://orgprints.org/32324/1/garland-etal-2017-PlantSoil-Vol-415-Issue1-2-p37-55.pdf
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Pseudomonas protegens CHA0 does not increase phosphorus uptake from 33P labeled synthetic hydroxyapatite by wheat grown on calcareous soil Organic Eprints
Meyer, G.; Maurhofer, M.; Frossard, E.; Gamper, H. A.; Mäder, P.; Mészáros, É.; Schönholzer-Mauclaire, L.; Symanczik, S.; Oberson, A..
Soil microorganisms exuding organic acids have the potential to solubilize inorganic phosphorus (P), which could improve the P availability to plants growing on calcareous soil. The gluconic acid exuding bacteria Pseudomonas protegens CHA0 can solubilize P under glucose rich in vitro conditions, but evidence on the effectiveness in soil is lacking. This discrepancy in P solubilization between in vitro and in vivo is common for many P solubilizing bacteria. Possible causes for this discrepancy are rarely explored in soil using mechanism oriented approaches. Proposed reasons for limitation of bacterial P solubilization in soil are low persistence of the inoculant or low glucose availability in the plant rhizosphere. To test these two hypotheses we...
Tipo: Journal paper Palavras-chave: Cereals; Pulses and oilseeds Nutrient turnover.
Ano: 2019 URL: http://orgprints.org/36362/1/Meyer-etal-2019-SoilBiolBiocehmistry-Vol131-p217-228.pdf
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Symbiont identity matters: carbon and phosphorus fluxes between Medicago truncatula and different arbuscular mycorrhizal fungi Organic Eprints
Lendenmann, M.; Thonar, C.; Barnard, R.L.; Salmon, Y.; Werner, R.A.; Frossard, E.; Jansa, J..
Many studies have scrutinized the nutritional benefits of arbuscular mycorrhizal associations to their host plants, while the carbon (C) balance of the symbiosis has often been neglected. Here, we present quantification of both the C costs and the phosphorus (P) uptake benefits of mycorrhizal association between barrel medic (Medicago truncatula) and three arbuscular mycorrhizal fungal species, namely Glomus intraradices, Glomus claroideum, and Gigaspora margarita. Plant growth, P uptake and C allocation were assessed 7 weeks after sowing by comparing inoculated plants with their non-mycorrhizal counterparts, supplemented with different amounts of P. Isotope tracing (3)(3)P and (1)(3)C) was used to quantify both the mycorrhizal benefits and the costs,...
Tipo: Journal paper Palavras-chave: Soil.
Ano: 2011 URL: http://orgprints.org/26367/1/Lendenmann_etal_2011_mycorrhiza.pdf
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Symbiotic N2 fixation by soybean in organic and conventional cropping systems estimated by 15N dilution and 15N natural abundance Organic Eprints
Oberson, A.; Nanzer, S.; Bosshard, C.; Dubois, D.; Mäder, P.; Frossard, E..
Nitrogen (N) is often the most limiting nutrient in organic cropping systems. N2 fixing crops present an important option to improve N supply and to maintain soil fertility. In a field experiment, we investigated whether the lower N fertilization level and higher soil microbial activity in organic than conventional systems affected symbiotic N2 fixation by soybean (Glycine max, var. Maple Arrow) growing in 2004 in plots that were since 1978 under the following systems: bio-dynamic (DYN); bio-organic (ORG); conventional with organic and mineral fertilizers (CON); CON with exclusively mineral fertilizers (MIN); non-fertilized control (NON). We estimated the percentage of legume N derived from the atmosphere (%Ndfa) by the natural abundance (NA) method. For...
Tipo: Journal paper Palavras-chave: Nutrient turnover Cereals; Pulses and oilseeds.
Ano: 2007 URL: http://orgprints.org/13460/1/oberson-etal-2007-plant-and-soil_290_69-83.pdf
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Water soluble phosphate fertilizers for crops grown in calcareous soils - an outdated paradigm for recycled phosphorus fertilizers Organic Eprints
Meyer, G.; Frossard, E.; Mäder, P.; Nanzer, S.; Randall, D.G.; Udert, K.M.; Oberson, A..
Background and aims The current paradigm for phosphorus (P) fertilizers applied to calcareous soil is that almost entirely water soluble P fertilizers are efficient and sparingly soluble P fertilizers are not efficient P sources for crops. We hypothesize that this paradigm does not apply to recycled P fertilizers and that other P pools can explain the plant use of recycled P fertilizers on calcareous soil. Methods We applied 33P isotopic dilution method to evaluate recycled P fertilizers based on plant P uptake from fertilizer relative to plant uptake from a water soluble P reference fertilizer. The predictability of fertilizer effectiveness based on sequentially extracted P forms and X-ray diffraction pattern of recycled fertilizers derived from sewage...
Tipo: Journal paper Palavras-chave: Composting and manuring; Nutrient turnover.
Ano: 2018 URL: http://orgprints.org/32919/1/Meyer2018-Water%20soluble%20phosphate%20fertilizers%20for%20crops%20grown%20in%20calcareous%20soils%20%E2%80%93%20an%20outdated%20paradigm%20for%20recycled%20phosphorus%20fertilizers.pdf
Registros recuperados: 16
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