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Registros recuperados: 62
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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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Arealet med frøbælgplanter bør øges Organic Eprints
Hauggaard-Nielsen, Henrik; Jørnsgaard, Bjarne; Jensen, Erik Steen.
Et igangværende samarbejdsprojekt mellem Landbohøjskolen, Danmarks JordbrugsForskning og Risø , finansieret af FØJO (Forskningscenter for Økologisk Jordbrug), tager afsæt i at forøge produktionen af protein og kornafgrøder i det økologiske jordbrug for at blive i stand til at dække et stigende behov for fodermidler til specielt svin og fjerkræ. I henhold til nye EU regler skal alle fodermidler desuden være økologisk producerede, dvs. også fri for gensplejsede organismer, fra 2005. Denne forskning anses ikke kun at være relevant for Økologisk Jordbrug, men i høj grad også de konventionelle landbrugssystemer, specielt fordi debatten om import af soja forventes at fortsætte.
Tipo: Newspaper or magazine article Palavras-chave: Markets and trade.
Ano: 2002 URL: http://orgprints.org/101/1/landsbladet.bmp
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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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Blandingsafgrøder giver gevinst Organic Eprints
Knudsen, Marie Trydeman; Hauggaard-Nielsen, Henrik; Jensen, Erik Steen.
Bebre udnyttelse af kvælstof, mindre ukrudtsbekæmpelse og højere proteinprocent i kornet er nogle af gevinsterne, når frøbælgplanter dyrkes sammen med byg.
Tipo: Newspaper or magazine article Palavras-chave: Cereals; Pulses and oilseeds.
Ano: 2002 URL: http://orgprints.org/1354/1/Blandingsafg.htm
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Cereal-grain legume intercropping in organic farming - a Danish survey Organic Eprints
Knudsen, Marie Trydeman; Hauggaard-Nielsen, Henrik; Jensen, Erik Steen.
Danish farmers' experiences with cereal-legume intercropping were investigated in a survey. The survey showed the most commonly used mixture and farmers' strategies and experiences with intercropping among other issues. Furthermore, the survey was shown valuable to target future research strategies.
Tipo: Conference paper, poster, etc. Palavras-chave: Cereals; Pulses and oilseeds Production systems Farm nutrient management.
Ano: 2004 URL: http://orgprints.org/9339/1/Knudsen_et_al._(2004)_Cereal%2Dgrain_legume_intercropping_in_organic_farming_%2D_a_Danish_survey.pdf
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Comparison of interspecific competition and N use in pea–barley, faba bean–barley and lupin–barley intercrops grown at two temperate locations Organic Eprints
Knudsen, Marie Trydeman; Hauggaard-Nielsen, Henrik; Joernsgaard, Bjarne; Jensen, Erik Steen.
Mixed intercropping of spring barley (Hordeum vulgare L.) with field pea (Pisum sativum L.), faba bean (Vicia faba var. minor L.) or narrow-leafed lupin (Lupinus angustifolius L.) was compared to sole cropping in two field experiments at different locations, on a sandy loam soil and a sandy soil, in Denmark in 2001. Grain legumes were dominant in intercrops on the sandy loam soil, except for lupin, whereas barley was dominant in intercrops on the sandy soil site. Combined intercrop grain yields were comparable to grain yields of the respective sole cropped grain legume or sole cropped, fertilized barley on each soil site. On the sandy loam soil, pea-barley and faba bean-barley intercrops increased the proportion of plant N derived from N2 fixation in...
Tipo: Journal paper Palavras-chave: Crop combinations and interactions.
Ano: 2004 URL: http://orgprints.org/4049/1/4049.pdf
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Del og hersk Organic Eprints
Knudsen, Marie Trydeman; Hauggaard-Nielsen, Henrik; Jensen, Erik Steen.
I dag udnytter flere og flere økologiske landmænd fordelene ved samdyrkning af bælgsæd og korn. Fordelene er mere stabile udbytter, mindre ukrudtstryk og lejesæd samt forbedret produktkvalitet for eksempel i form af mindre ærtesyge og højere proteinindhold i kornet. Der er dog stadig et væsentligst problem, nemlig at blandingspartier på nuværende tidspunkt ikke er en accepteret handelsvare. Det er problematisk, hvis ikke man selv har husdyr eller kan afsætte høsten direkte til en landmand, der kan fodre med blandingen. I dag er det oftest nødvendigt at lade korn- og foderstoffirmaet adskille blandingen mod betaling. Denne meromkostning er mange landmænd trætte af. Udbyttegevinsten, der opnås i blandingerne, forsvinder til disse ekstra omkostninger.
Tipo: Newspaper or magazine article Palavras-chave: Crop husbandry.
Ano: 2003 URL: http://orgprints.org/1352/2/Andres_Lassen.pdf
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Density and relative frequency effects on competitive interactions and resource use in pea-barley intercrops Organic Eprints
Hauggaard-Nielsen, Henrik; Andersen, Mette Klindt; Joernsgaard, Bjarne; Jensen, Erik Steen.
Intercropping advantages may be influenced by both plant density and relative frequency of the intercrop components. In a field study barley (Hordeum vulgare L.) and pea (Pisum sativum L.) were sole cropped and intercropped at three densities, corresponding to i) half of the recommended, ii) the recommended and iii) twice the recommended plant density. Two intercrops combinations were included holding 1/3pea+2/3barley and 2/3pea+1/3barley relative to the sole crop densities employed. For three growth intervals within the whole growing period, the relative performance and interactions between the two crops were assessed using the Relative Efficiency Index (REIc). The relative performance of the two species varied over the growing season and was influenced...
Tipo: Journal paper Palavras-chave: Crop combinations and interactions.
Ano: 2005 URL: http://orgprints.org/4053/1/4053.pdf
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Early interference dynamics in intercrops of pea, barley and oilseed rape Organic Eprints
Bellostas, Natalia; Hauggaard-Nielsen, Henrik; Andersen, Mette Klindt; Jensen, Erik Steen.
Intercropping, the practical application of ecological principles such as diversity, interference, competition and coexistence in agriculture, is gaining increasing interest in organic farming. To be able to improve the management of intercrops, a more detailed knowledge is required on aspects of interference between crops. A bioassay and a pot experiment were conducted to assess both the mechanisms and the time of expression of processes involved in the early interference between pea (Pisum sativum L.), barley (Hordeum vulgare L.) and oilseed rape (Brassica napus L.) when grown as intercrops. Conditions of non-limiting nutrient and water supply were chosen to eliminate competition for these growth factors. The bioassay gave no indication of competitive...
Tipo: Journal paper Palavras-chave: Crop combinations and interactions.
Ano: 2003 URL: http://orgprints.org/1450/2/1450.pdf
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Eco-functional intensification by cereal-grain legume intercropping in organic farming systems for increased yields, reduced weeds and improved grain protein concentration Organic Eprints
Bedoussac, Laurent; Journet, Etienne-Pascal; Hauggaard-Nielsen, Henrik; Naudin, Christophe; Corre-Hellou, Guénaëlle; Prieur, Loïc; Jensen, Erik Steen; Justes, Eric.
Organic farming is based on to rely on a higher cropping systems diversity than its conventional counterpart and is regarded as one prototype to enhance the sustainability of agriculture and cereal-rich cropping systems. Nevertheless, organic arable crop rotations in temperate regions consist mainly of sole crops (SC; pure stands), with diverse pastures in farming systems with livestock being an exception (Hauggaard-Nielsen et al. 2001b). In organic farming, nitrogen (N) availability can be limiting especially in the absence of livestock (David et al. 2005ab) and causes cereal yield depressions and lower protein contents. For these reasons, integrating legumes with symbiotic fixation of atmospheric N2 is essential for balancing nitrogen exports from the...
Tipo: Book chapter Palavras-chave: "Organics" in general Pasture and forage crops Crop combinations and interactions Cereals; Pulses and oilseeds Farm nutrient management.
Ano: 2012 URL: http://orgprints.org/20917/7/20917.pdf
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Effects from intercropping of pea and barley on the content of protein and bioactive molecules in the seeds Organic Eprints
Jensen, Erik Steen; Mørkeberg, Anette; Sørensen, Hilmer; Sørensen, Susanne.
Seeds from pea and barley grown as monocrop and in intercropping systems have been investigated. The prelimenary results obtained have revealed effects from intercropping on chemical composition, protein content and relative amounts of individual proteins. Some bioactive seed components (xenobiotics) call for additional investigations.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection.
Ano: 2001 URL: http://orgprints.org/1448/1/Effects_from_intercropping_of_pea.pdf
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Effects of bioethanol residues on the functional and genetic diversity of soil microbiota Organic Eprints
Johansen, Anders; Stevenson, Bryan; Hauggaard-Nielsen, Henrik; Jensen, Erik Steen.
Regarding the use of residual material from bioethanol conversion, a series of experiments were performed. The work included two NZ soils from organic farming systems (Templeton and Ballantray, respectively) and treatments with three types of biomaterials: 1) residual material from bio-ethanol conversion (based on rye straw; 2) untreated rye straw; 3) grass-clover mixture - as well as a control with no amendment. The dried and ground biomaterials were supplied at 2 and 10 mg kg-1 dry soil, incubated in 1-L glass vials and harvested destructively after 3, 5 and 21 days. In this way, four experimental series were performed, each with three sequential harvests. The soil was analyzed for various microbial parameters: bacterial colony-forming units (not in all...
Tipo: Newspaper or magazine article Palavras-chave: Soil quality; Nutrient turnover; Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/16901/4/16901.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 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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Einflüsse der Rhizodeposition von Körnerleguminosen auf den Umsatz ihrer Residuen im Boden Organic Eprints
Mayer, Jochen; Buegger, Franz; Jensen, Erik Steen; Schloter, Michael; Heß, Jürgen.
Fazit: Die Ergebnisse bestätigen die Bedeutung des NdfR* als ein wesentlicher Faktor für die N-Dynamik nach Körnerleguminosen. Der NdfR wird hauptsächlich als mikrobielle Residualmasse im Boden immobilisiert und bildet damit einen labilen Pool der organischen Bodensubstanz. Die Rhizodeposition von Körnerleguminosen beeinflusst, vermutlich über Interaktionen mit den Bodenmikroorganismen, den anschließenden Umsatz ihrer Residuen. Das Ausmaß dieser Wirkungen ist pflanzenartspezifisch und wahrscheinlich durch die Menge und Zusammensetzung der Rhizodeposition bestimmt. Zur Optimierung ökologischer Pflanzenbausysteme muss das Verständnis dieser Prozesse weiter vertieft werden. * Nach der Ernte der oberirdischen Pflanzenteile zur Reife der Pflanzen wurden...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover Cereals; Pulses and oilseeds Soil biology.
Ano: 2003 URL: http://orgprints.org/932/1/mayer%2D2003%2Drhizodeposition%2Dkoernerleguminosen.pdf
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Empirical model for quantification of symbiotic nitrogen fixation in grass-clover mixtures Organic Eprints
Høgh-Jensen, Henning; Loges, Ralf; Jensen, Erik Steen; Jørgensen, Finn V.; Vinther, Finn P..
Symbiotically fixed nitrogen (N2) is an important input of nitrogen (N) source in many agricultural systems. In spite of this fact, the input of symbiotically fixed N to a particular cropping system is usually not known and exact measurements are costly and laborious. Consequently, there is a demand for an uncomplicated and reliable tool to estimate symbiotic N2 fixation (SNF) in leguminous crops. A simple emperical model is proposed for quantification of SNF in forage legumes under low external input conditions. The model estimates SNF using dry matter yield as input and parameters for (i)N concentration in dry matter and the (ii) proportion of the N in the legume that is derived from the atmosphere. Further, the model includes fixed N not included in the...
Tipo: Journal paper Palavras-chave: Pasture and forage crops.
Ano: 2004 URL: http://orgprints.org/3085/1/emperical_model.pdf
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Empirical model for quantification of symbiotic nitrogen fixation in leguminous crops Organic Eprints
Høgh-Jensen, Henning; Loges, Ralf; Jensen, Erik Steen; Jørgensen, Finn V.; Vinther, Finn P..
Symbiotically fixed N2 (SNF) is an important input of nitrogen (N) in many cropping systems. In spite of this fact, the input of fixed N to a particular cropping system is usually not known, and an exact estimation of the amount of N2 fixed requires laborious measurements. Consequently, there is a demand for a simple and reliable tool to estimate N2 fixation in leguminous crops. A model is here proposed for quantification of SNF in leguminous crops in different arable systems. The model estimates SNF using dry matter yield as input and cropping system specific values for the parameters: N concentration in dry matter and the proportion of the N in the legume that is derived from the atmosphere. Further, the model includes fixed N not included in the...
Tipo: Journal paper Palavras-chave: Production systems.
Ano: 2003 URL: http://orgprints.org/316/1/Emperical_N2%2Dfixation_eng_v6.doc
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Evaluating pea and barley cultivars for complementarity in intercropping at different levels of soil N availability Organic Eprints
Hauggaard-Nielsen, Henrik; Jensen, Erik Steen.
Two field experiments were carried out on a temperate sandy loam using six pea (Pisum sativum L.) and five spring barley (Hordeum vulgare L.) cultivars to determine cultivar complementarity in the intercrop for grain yield, dry matter production and nitrogen (N) acquisition. Crops were grown with or without the supply of 40 or 50 kg N ha-1 in the two experiments. Cultivars were grown as sole crops (SC) and as mixed intercrops (IC) using a replacement design (50:50). The Land Equivalent Ratio (LER), which is defined as the relative land area under sole crops that is required to produce the yields achieved in intercropping, were used to compare cultivar performance in intercropping relative to sole cropping. Barley was the stronger competitor in the...
Tipo: Journal paper Palavras-chave: Crop combinations and interactions Cereals; Pulses and oilseeds.
Ano: 2001 URL: http://orgprints.org/37/1/cultivar.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
Registros recuperados: 62
Primeira ... 1234 ... Última
 

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