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Registros recuperados: 44
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Afgrøderester og sædskifte har stor betydning for udledning af lattergas Organic Eprints
Petersen, Søren O.; Schjønning, P.; Ambus, Per.
Lattergas udgør en del af det atmosfæriske tab af kvælstof fra dyrkningsjorden. Målt i kg kvælstof er mængderne små, men fordi lattergas er en meget kraftig drivhusgas, er gassens betydning for landbrugets samlede udledninger stor.
Tipo: Newspaper or magazine article Palavras-chave: Cereals; Pulses and oilseeds Air and water emissions Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/22013/1/22013.pdf
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Annual maize and perennial grass-clover strip cropping to produce biomass for bioenergy – within an organic farming approach Organic Eprints
Hauggaard-Nielsen, Henrik; Johansen, Anders; Carter, Mette S.; Ambus, Per; Jensen, Erik Steen.
A field experiment was carried out including alternating perennial ryegrass (Lolium perenne L.) – clover (Trifolium repens + Trifolium pretense L.) pasture mix with annual maize (Zea mays L.). Maize was established after soil incorporation of a 1st-year grass-clover in a 6-m wide strip, whereas grass-clover was established without incorporating the 1st-year grass-clover in an equivalent 6-m wide strip. This resulted in an early interspecific competitive advantage for the perennial strip and when growing maize in close proximity to grass-clover total dry matter production was reduced with about 50% compared to >150 cm distance. However, it was partly compensated by greater yields by especially the 50-100 cm harvest. In contrast there was no significant...
Tipo: Journal paper Palavras-chave: "Organics" in general Crop combinations and interactions Composting and manuring Recycling; Balancing and resource management Farm nutrient management.
Ano: 2012 URL: http://orgprints.org/20914/7/20914.pdf
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Biologically fixed N2 as a source for the N2O production in a grass clover mixture, measured by 15N2 Organic Eprints
Carter, Mette S.; Ambus, Per.
The contribution of biologically fixed dinitrogen (N2) to the nitrous oxide (N2O) production in grasslands is unknown. To assess the contribution of recently fixed N2 as a source of N2O and the transfer of fixed N from clover to companion grass, mixtures of white clover and perennial ryegrass were incubated for 14 days in a growth cabinet with a 15N2-enriched atmosphere (0.4 atom% excess). Immediately after labelling, half of the grass-clover pots were sampled for N2 fixation determination, whereas the remaining half were examined for emission of 15N labelled N2O for another eight days using a static chamber method. Biological N2 fixation measured in grass-clover shoots and roots as well as in soil constituted 342, 38 and 67 mg N m-2 d-1 at 16, 26 and 36...
Tipo: Journal paper Palavras-chave: Pasture and forage crops; Air and water emissions.
Ano: 2006 URL: http://orgprints.org/10144/1/10144.pdf
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Biomass production, symbiotic nitrogen fixation and inorganic N use in dual and tri-component annual intercrops Organic Eprints
Andersen, Mette Klindt; Hauggaard-Nielsen, Henrik; Ambus, Per; Jensen, Erik Steen.
The interspecific complementary and competitive interactions between pea (Pisum sativum L.), barley (Hordeum vulgare L.) and oilseed rape (Brassica napus L.), grown as dual and tri-component intercrops were assessed in a field study in Denmark. Total biomass production and N use at two levels of N fertilisation (0.5 and 4.0 g N/m2), were measured at five harvests throughout a growing season. All intercrops displayed land equivalent ratio values close to or exceeding unity, indicating complementary use of growth resources. Whereas both rape and barley responded positively to increased N fertilisation, irrespective of whether they were grown as sole- or intercrops, pea was strongly suppressed when grown in intercrop. Of the three crops barley was the...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Crop combinations and interactions.
Ano: 2004 URL: http://orgprints.org/6002/1/MKA.pdf
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Consequences of agro-biofuel production for greenhouse gas emissions Organic Eprints
Carter, Mette S.; Johansen, Anders; Haugaard-Nielsen, Henrik; Ambus, Per.
The objective of the study was to examine the effect on N2O and CH4 emissions when residues from bio-energy production are recycling as organic fertilizer for a maize energy crop. The study showed that the N2O emission associated with the cultivation of the maize crop offset a considerable faction of the fossil CO2, which was avoided by producing the biofuels.
Tipo: Conference paper, poster, etc. Palavras-chave: Air and water emissions.
Ano: 2008 URL: http://orgprints.org/15844/1/15844.pdf
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Consequences of agro-biofuel production for greenhouse gas emissions Organic Eprints
Carter, Mette S.; Hauggaard-Nielsen, Henrik; Johansen, Anders; Ambus, Per.
Currently CO2 from fossil fuel combustion accounts for 57% of the global greenhouse gas emissions, whereas the strong greenhouse gases nitrous oxide (N2O) and methane (CH4) contribute with 8% and 14%, respectively (IPCC, 2007). Agricultural activity is the dominant source of N2O, which is mainly associated with the use of nitrogen based fertilizers in agricultural production. Replacing fossil fuel-derived energy by biomass-derived energy is commonly and with increasing emphasis proposed as a mean to mitigate the CO2 emissions. However, a recent analysis of global emission data proposes that accelerated emissions of N2O associated with the production of biomass for bio-fuel purposes will outweigh the avoided emissions of fossil fuel-derived CO2 (Crutzen et...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover Recycling; Balancing and resource management Air and water emissions Composting and manuring.
Ano: 2009 URL: http://orgprints.org/16179/1/16179.pdf
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Consequences of field N2O emissions for the environmental sustainability of plant-based biofuels produced within an organic farming system Organic Eprints
Carter, Mette S.; Hauggaard-Nielsen, Henrik; Heiske, Stefan; Jensen, Morten; Thomsen, Sune T.; Schmidt, Jens Ejbye; Johansen, Anders; Ambus, Per.
One way of reducing the emissions of fossil fuel-derived carbon dioxide (CO2) is to replace fossil fuels with biofuels produced from agricultural biomasses or residuals. However, cultivation of soils results in emission of other greenhouse gasses (GHGs), especially nitrous oxide (N2O). Previous studies showed that field emissions of N2O may contribute significantly to total GHG emissions during biofuel production. Furthermore, N2O may counterbalance a considerable part of the global warming reduction, which is achieved by fossil fuel displacement. In the present study, we related measured field emissions of N2O to the reduction in fossil fuel-derived CO2, which was obtained when agricultural biomasses were used for biofuel production. The analysis included...
Tipo: Journal paper Palavras-chave: Pasture and forage crops Cereals; Pulses and oilseeds Nutrient turnover Air and water emissions.
Ano: 2012 URL: http://orgprints.org/20905/10/20905.pdf
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Effects of digestate from anaerobic digested cattle slurry and plant materials on soil microbiota and fertility Organic Eprints
Johansen, Anders; Carter, Mette S.; Jensen, Erik Steen; Hauggaard-Nielsen, Henrik; Ambus, Per.
Anaerobic digestion of animal manure and crop residues may be employed to produce biogas as a climate-neutral source of energy to provide fertilizers which allow recycling of plant nutrients on the farm. However, compared to fertilizing with the pristine input materials (e.g. raw animal slurry or plant residues), the effect on soil microbiota and soil fertility may be impacted due to the increased content of mineral nitrogen (N) and decreased amount of organic carbon (C); an issue of concern in especially organic farming systems. An incubation study was performed where 1) water, 2) raw cattle slurry, 3) anaerobically digested cattle slurry + maize, 4) anaerobically digested cattle slurry + grass-clover, or 5) fresh grass-clover was applied to soil at...
Tipo: Journal paper Palavras-chave: Soil quality; Nutrient turnover; Air and water emissions; Biodiversity and ecosystem services; Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/20446/4/20446.pdf
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Effects of digestate from anaerobic fermented cattle slurry and plant materials on soil microbiota and fertility Organic Eprints
Johansen, Anders; Carter, Mette S.; Jensen, Erik Steen; Hauggaard-Nielsen, Henrik; Ambus, Per.
Soil from the Højbakkegård experimental (BioConcens) field was amended with nothing (control), each of two anaerobic digested (AD) materials (mixture of AD cattle manure and maize, mixture of AD cattle manure and cut off grass-clover material), raw cattle manure, and grass-clover in five individual treat-ments. The materials were incorporated homogeneously into the soil and sampled destructively at 0, 1, 3 and 9 days after incorporation. Besides, experiments were performed to follow the turnover of these materials, measured as accumulated respiration over a longer period. Measures included available organic soil carbon (cold- and hot-water extractable), soil mineral nitrogen concentration, soil pH, accumulated respiration over a two-week period, emission...
Tipo: Journal paper Palavras-chave: Soil quality; Nutrient turnover; Air and water emissions; Biodiversity and ecosystem services; Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/18894/7/18894.pdf
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Effects of green manure storage and incorporation methods on greenhouse gas fluxes and N mineralization after soil application Organic Eprints
Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ambus, Per.
Organic arable farming faces challenges with low crop yields, partly due to inefficient use of green manure-derived nitrogen (N). Under current farming practices, green manure leys are often cut and mulched during the growing season with the associated risk of environmental N losses, leading to eutrophication and global warming. In this 3-month incubation experiment, we tested a new green manure management strategy as part of the ICROFS project HighCrop. With the new strategy, green manure leys are instead harvested and preserved until the following spring either as compost mixed with straw (grass-clover:straw, 4:1, w:w) or as silage of harvested ley biomass. In spring, these two green manure materials can then be used for targeted fertilization of spring...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2013 URL: http://orgprints.org/25941/19/25941a.pdf
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Effects of green manure storage and incorporation methods on nitrogen release and N2O emissions after soil application Organic Eprints
Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ma, Xiuzhi; Ambus, Per.
More efficient use of green manure-derived nitrogen (N) may improve crop yields and reduce environmental impacts in stockless organic arable farming. In this 3-month incubation study, we tested a new strategy where green manure leys are harvested and preserved until the following spring either as compost mixed with straw or as silage of harvested ley biomass. Grass-clover compost or silage was soil-incorporated by either simulated ploughing (green manure placed at 15 cm depth) or harrowing (green manure mixed into the upper 5-cm soil horizon) in order to assess treatment effects on net release of plant-available N, nitrous oxide (N2O) fluxes, and soil respiration. Grass-clover silage provided the highest net N release with similar results for the two...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2014 URL: http://orgprints.org/27643/25/Carter%20et%20al.%202014_BFOS.pdf
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Effects of green manure storage and incorporation methods on nitrogen release and N2O emissions after soil application Organic Eprints
Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ma, Xiuzhi; Ambus, Per.
More efficient use of green manure-derived nitrogen (N) may improve crop yields and reduce environmental impacts in stockless organic arable farming. In this 3-month incubation study, we tested a new strategy where green manure leys are harvested and preserved until the following spring either as compost mixed with straw or as silage of harvested ley biomass. Grass-clover compost or silage was soil-incorporated by either simulated ploughing (green manure placed at 15 cm depth) or harrowing (green manure mixed into the upper 5-cm soil horizon) in order to assess treatment effects on net release of plant-available N, nitrous oxide (N2O) fluxes, and soil respiration. Grass-clover silage provided the highest net N release with similar results for the two...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2014 URL: http://orgprints.org/26717/13/Carter%20et%20al.%202014_BFOS_online.pdf
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Effects of green manure storage and incorporation methods on nitrogen release and N2O emissions after soil application Organic Eprints
Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ma, Xiuzhi; Ambus, Per.
More efficient use of green manure-derived nitrogen (N) may improve crop yields and reduce environmental impacts in stockless organic arable farming. In this 3-month incubation study, we tested a new strategy where green manure leys are harvested and preserved until the following spring either as compost mixed with straw or as silage of harvested ley biomass. Grass-clover compost or silage was soil-incorporated by either simulated ploughing (green manure placed at 15 cm depth) or harrowing (green manure mixed into the upper 5-cm soil horizon) in order to assess treatment effects on net release of plant-available N, nitrous oxide (N2O) fluxes, and soil respiration. Grass-clover silage provided the highest net N release with similar results for the two...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2014 URL: http://orgprints.org/25158/7/25158.pdf
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Effects of green manure storage and incorporation methods on nitrogen release and N2O emissions after soil application Organic Eprints
Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ma, Xiuzhi; Ambus, Per.
More efficient use of green manure-derived nitrogen (N) may improve crop yields and reduce environmental impacts in stockless organic arable farming. In this 3-month incubation study, we tested a new strategy where green manure leys are harvested and preserved until the following spring either as compost mixed with straw (grass-clover:straw, 4:1, w:w) or as silage of harvested ley biomass. Grass-clover compost or silage was soil-incorporated by either simulated ploughing (green manure placed at 15 cm depth) or harrowing (green manure mixed into the upper 5-cm soil horizon) in order to assess treatment effects on net release of plant-available N, nitrous oxide (N2O) fluxes, and soil respiration. Grass-clover silage provided the highest net N release with...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2013 URL: http://orgprints.org/24960/7/24960.pdf
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Effects of strip intercropping concept with perennial diversified grass-clover strip and annual winter rye-winter vetch intercrop as energy crops Organic Eprints
Hauggaard-Nielsen, Henrik; Johansen , Anders; Carter, Mette S.; Ambus, Per; Jensen, Erik Steen.
The combination of perennials and annuals in a strip cropping system is challenging primarily because the interspecific competitive ability of the perennials towards the annuals seems to be too dominating. Especially at the first harvest (tillering) closest to the adjacent grass-clover strip severe total dry matter production reductions was found ranging from 25%, 5% and 20% in the vetch SC, rye SC and vetch-rye IC, respectively. Rye in particular was suffering from the grass-clover interspecific competition with a SC yield of 700 g DM m-2 (0-25 cm) at maturity as compared to 1025 g DM m-2 when grown > 150 cm away. When grown >150 cm away from the grass-clover strip rye accumulate 8 g soil mineral N m-2,which is in the range of the expected according...
Tipo: Journal paper Palavras-chave: Crop combinations and interactions Composting and manuring Recycling; Balancing and resource management Crop husbandry Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/18946/4/18946.pdf
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Evaluation of strip intercropping concept with grass-clover and maize strips to produce biomass for bioenergy Organic Eprints
Hauggaard-Nielsen, Henrik; Johansen, Anders; Carter, Mette S.; Ambus, Per; Jensen, Erik Steen.
To enhance integrity of organic farming it is important not only to deliver high quality food products to a growing market but also to include strategies to reduce the reliance on fossil fuels and decrease total greenhouse gas emissions. In this context, the increased use of perennials within traditionally more annual-based rotations may gain significant importance. The objective of this study was to determine the effect of a strip cropping strategy combining intercropping of a grass-clover based perennial forage crop mixture (soil fertility building (SFB) crop) and maize in strips on the biomass productivity per land area and to determine interactions between strip border rows and associated mechanisms responsible for a potentially improved resource use...
Tipo: Journal paper Palavras-chave: "Organics" in general Crop combinations and interactions Composting and manuring Recycling; Balancing and resource management Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/19008/4/19008.pdf
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Field emissions of N2O during biomass production may affect the sustainability of agro-biofuels Organic Eprints
Carter, Mette S.; Hauggaard-Nielsen, Henrik; Heiske, Stefan; Thomsen, Sune T.; Jensen, Morten; Schmidt, Jens Ejbye; Johansen, Anders; Ambus, Per.
Field emissions of N2O during cultivation of bioenergy crops may counterbalance a considerable part of the avoided fossil CO2 emissions that are achieved by fossil fuel displacement
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2011 URL: http://orgprints.org/18332/4/18332.pdf
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From N2 fixation to N2O emission in a grass-clover mixture Organic Eprints
Thyme, Mette; Ambus, Per.
In organic dairy farming, a major N input to the plant-soil system comes from biological N2 fixation by pasture legumes, but knowledge is sparse on how much of the fixed N2 is lost from the pastures as N2O. Nitrifying and denitrifying bacteria are the main contributors to the N2O production in soils. Currently, no contribution from biological N2 fixation in legume pastures is included in the national N2O inventories, partly because of uncertainties in quantifying the N2 fixation in the pastures (Mosier et al., 1998). According to the guidelines issued by The Intergovernmental Panel on Climate Change (IPCC), inventories for N2O emissions from agricultural soils should be based on the assumption that 1.25 % of added N is emitted as N2O (IPCC, 1997). The...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Pasture and forage crops; Air and water emissions.
Ano: 2004 URL: http://orgprints.org/4147/1/4147.pdf
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From N2 fixation to N2O emission in a grass-clover pasture Organic Eprints
Thyme, Mette; Ambus, Per.
In organic dairy farming, a major N input to the plant-soil system comes from biological N2 fixation by pasture legumes, but knowledge is sparse on how much of the fixed N2 is lost from the pastures as N2O. Nitrifying and denitrifying bacteria are the main contributors to the N2O production in soils. Currently, no contribution from biological N2 fixation in legume pastures is included in the national N2O inventories, partly because of uncertainties in quantifying the N2 fixation in the pastures (Mosier et al., 1998). According to the guidelines issued by The Intergovernmental Panel on Climate Change (IPCC), inventories for N2O emissions from agricultural soils should be based on the assumption that 1.25 % of added N is emitted as N2O (IPCC, 1997). The...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Pasture and forage crops; Air and water emissions.
Ano: 2003 URL: http://orgprints.org/1464/1/Poster_Mette_Thyme.pdf
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Greenhouse gas emissions from cultivation of energy crops – is it important? Organic Eprints
Carter, Mette S.; Ambus, Per.
Replacing fossil fuel-derived energy with biomass-derived energy is commonly emphasized as a means to reduce CO2 emissions. However, our study highlights the risk of large greenhouse gas emissions when wastes from bioenergy production are recycled as fertilizer for energy crops. Crop management affects the magnitude of these emissions, which in some cases negate a considerable fraction of the global warming savings associated with biofuels.
Tipo: Newspaper or magazine article Palavras-chave: Nutrient turnover Recycling; Balancing and resource management Composting and manuring Air and water emissions.
Ano: 2009 URL: http://orgprints.org/16880/1/16880.pdf
Registros recuperados: 44
Primeira ... 123 ... Última
 

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