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| Registros recuperados: 62 | |
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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| Registros recuperados: 62 | |
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