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| Registros recuperados: 58 | |
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| Loges, Ralf; Biernat, Lars; Taube, Friedhelm. |
| Several studies have shown that changing from conventional to organic farming is an alternative to reduce negative impacts on the environment, for example nitrogen losses, reduced biodiversity and input of fossil energy per unit land and per unit product. In organic agriculture, as well, there is currently a trend towards specialized farming systems. To compensate for the lack of data on energy efficiency measured at farm scale, a comparison between three differently managed organic all-arable crop rotations and a typical rotation of typical regional N-intensive conventional farm was carried out over a two-year period at a highly productive site in northern Germany. Comparing the all-arable crop rotations, the organic systems had a 62 % lower output... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop husbandry; Biodiversity and ecosystem services. |
| Ano: 2013 |
URL: http://orgprints.org/21593/1/21593_Loges.pdf |
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| Loges, Ralf; Thaysen, Johannes. |
| Rotklee bzw. Luzerne in Reinsaat bzw. Gemenge stellen die wichtigsten Leguminosen des Ackerfutterbaus im Ökologischen Landbau dar. Diese Untersuchung setzt sich mit der Beeinflussbarkeit von Siliereignung und Futterwert unterschiedlicher Aufwüchse beider Leguminosen auseinander. Als Versuchsfaktoren wurden neben der Leguminosenart vor allem das Leguminosen/Gras-Siliermischungsverhältnis (Prüfglieder: a. 100%, b. 67%, c. 33%, d. 0% Leguminosenanteil) variiert. Mischungen mit Luzerne zeigten sich als deutlich schlechter silierbar als vergleichbare Mischungen mit Rotklee und wiesen bei geringeren Energiegehalten jedoch höhere Proteinkonzentrationen auf. Mit zunehmendem Leguminosenanteil in der Saatmischung und damit auch im Siliergut ergaben sich zunehmende... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops Cereals; Pulses and oilseeds. |
| Ano: 2003 |
URL: http://orgprints.org/2152/1/loges%2D2003%2Dsiliereignung%2Dluzerne%2Drotklee.pdf |
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| Loges, Ralf; Thaysen, Johannes; Taube, Friedhelm. |
| Als Teil eines mehrjährigen Feldversuchs mit dem Ziel des Vergleiches unterschiedlicher Futterleguminosen/Grassaatmischungen in Bezug auf Ertrag, Futterqualität, N2-Fixierung sowie Vorfruchtwert wurden ausgewählte Aufwüchse im Silierversuch bezüglich Siliereignung sowie Silagequalität geprüft. Der Silierversuch umfasste die Faktoren Leguminosenart (Prüfglieder: a. Rotklee, b. Luzerne) Leguminosen/Gras-Siliermischungsverhältnis (Prüfglieder: a. 100%, b. 67%, c. 33%, d. 0% Leguminosenanteil) und Aufwuchs (Prüfglieder: a. 1. Aufwuchs (Gras: generativ, Leguminose nicht generativ) b. 3. Aufwuchs (Gras nicht generativ, Leguminose generativ)). Mischungen mit Luzerne zeigten sich als deutlich schlechter silierbar als vergleichbare Mischungen mit Rotklee und... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops Feeding and growth Cereals; Pulses and oilseeds. |
| Ano: 2002 |
URL: http://orgprints.org/2150/1/loges%2D2002%2Dsilagequalitaet%2Drotklee%2Dluzerne%2Dgras.pdf |
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| Mauscherning, Inken; Loges, Ralf; Pedersen, Lene; Taube, Friedhelm. |
| In maritime climates the production of winter wheat often leads to high nitrate leaching losses. In this study mixtures of winter wheat and catch crops were analyzed as alternative growing system to avoid high leaching losses. In a field experiment pure winter wheat grown as control showed highest N-losses. Leaching losses of 140 kg N ha-1 after the pre-crop grass-clover and of 50 kg N ha-1 after oats as pre-crop were measured. Compared to this, growing winter wheat in mixture with forage rape or oats reduced nitrate leaching by 50 %. Common vetch as mixture partner to winter wheat had a lower potential to reduce leaching losses. Comparable results were obtained growing the catch crops alone followed by spring wheat. Due to the competition for growth... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Air and water emissions. |
| Ano: 2006 |
URL: http://orgprints.org/7577/1/Mauscherning.doc |
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| Loges, Ralf; Kaske, A.; Ingwersen, K.; Taube, F.. |
| Fixed nitrogen accumulated by legumes is the main nitrogen source for organic farming systems. Knowledge about the amount of fixed nitrogen, its pathways into forage yield, crop residues, soil-N and yield formation of the following crop is needed for designing crop rotations. In a field experiment conducted in Northern Germany differently managed (cut, mulched) legumes (red clover, alfalfa, white clover) in pure stands and in mixture with a companion grass (Lolium perenne) have been grown to determine Yield, forage-quality, N2-fixation and residue nitrogen. Cropped grass/legume reached higher N2-fixation than mulched. While green manure grass/legume left up to 296 kg ha-1 of N in mulch, stubble and roots on the field, most cropped grass/legume mixtures... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover Crop combinations and interactions Cereals; Pulses and oilseeds. |
| Ano: 2000 |
URL: http://orgprints.org/2145/1/loges%2D2000%2Dforage%2Dlegumes.pdf |
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| Neumann, Helge; Loges, Ralf; Taube, Friedhelm. |
| A comparative study on the abundance of breeding birds and wintering birds was carried out over the period 2005-2007 in conventionally and organically managed arable fields in Northern Germany. Birds were surveyed on 40 (breeding season) and 35 (non-breeding season) pairs of fields (conventional/organic), which were selected with regard to similar field sizes, comparable boundary structures (hedges, shrubs) and representative crop rotations. Averaged over three years of investigation, skylarks (Alauda arvensis) and, less distinct, pheasants (Phasianus colchicus) occurred more often on organic fields. In contrast, yellow wagtails (Motacilla flava) showed higher abundances on conventional fields in one year. The diversity of farmland bird species was not... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2008 |
URL: http://orgprints.org/12173/1/Neumann_12173_ed.doc |
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| Loges, Ralf; Wichmann, Stefan; Taube, Friedhelm. |
| Rotklee, Luzerne und Weißklee stellen vor allem im Gemenge mit Gräsern in zahlreichen ökologisch wirtschaftenden Betrieben die Basis der Winterfutterversorgung dar. Ertragsleistung und Futterqualität sind durch pflanzenbauliche Steuergrößen in weiten Bereichen beeinflussbar. Zu Vergleichen zwischen Rotklee, Luzerne und Weißklee hinsichtlich ihres Leistungspotentials liegen unter mitteleuropäischen Klimaverhältnissen nur wenige Untersuchungen vor. Im Rahmen eines dreijährigen Feldversuches der Einfluss der Faktoren Leguminosenart (Prüfglieder: Rotklee, Luzerne, Weißklee) und des Leguminosen/ Gras-Saatmischungsverhältnises (Prüfglieder: Leguminosenreinsaat, Leguminosen-Gras-Gemenge, Grasreinsaat) auf den TM-Ertrag, den Leguminosenanteil sowie die... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds. |
| Ano: 2001 |
URL: http://orgprints.org/2148/1/loges%2D2001%2Dertrag%2Dqualitaet%2Dluzerne%2D%2D.pdf |
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| Kelm, Michael; Loges, Ralf; Taube, Friedhelm. |
| Nitrogen (N) leaching, especially in the form of nitrate (NO3-), still represents a major environmental impact from agriculture. In order to estimate potential N leaching losses under conditions on commercial farms in Northern Germany, N leaching was analyzed by using ceramic suction cups on representative fields on eight organic and conventional farms. On dairy farms, permanent grassland and maize for silage were analyzed as the main fodder crops. On arable farms, one crop with a high risk and one with a low risk of N leaching losses were selected. On permanent grassland, N leaching was pronouncedly lower on organic farms. If grass/clover on organic farms was ploughed, high amounts of N were leached in the following winter, irrespective if grass/clover... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2007 |
URL: http://orgprints.org/11005/1/256_9765_Kelm_N%2DAuswaschung.pdf |
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| Loges, Ralf; Taube, Friedhelm. |
| Im Rahmen des interdisziplinären Forschungsprojektes Hof Ritzerau wurden zwei Fruchtfolgen mit unterschiedlichem Leguminosenanteil (40% bzw. 25%) über einen fünfjährigen Zeitraum (2004/05 – 2008/09)in Bezug auf Nitratauswaschung, Ertrag und N-Bilanz verglichen. Im Mittel der Sickerwasserperioden wurde ein deutlicher Einfluss der einzelnen Fruchtfolgeglieder auf das Ausmaß der Nitratauswaschung im folgenden Winter festgestellt. Nach Körnerleguminosen auf die intensive Bodenbearbeitung folgte bzw. nach Herbstumbruch von Kleegras wurden mit ca. 60 kg NO3-N/ha die höchsten Auswaschungen festgestellt, was bei einer Sickerwassermenge von ca. 313 mm eine deutliche Überschreitung der kritischen Nitratkonzentration von 50 mg je Liter Sickerwasser bedeutet.... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farm nutrient management. |
| Ano: 2011 |
URL: http://orgprints.org/17758/3/Loges_17758.pdf |
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| Loges, Ralf; Kornher, Alois; Taube, Friedhelm. |
| Rotklee/Gras stellt in ökologisch wirtschaftenden Betrieben häufig gleichzeitig die Basis der Winterfutterversorgung sowie die wichtigste N-Quelle dar. Zur Beurteilung der Leistungsfähigkeit von kleebasierten Anbausystemen fehlt es allerdings an Studien, die diese anbauentscheidenden Parameter gleichzeitig betrachten und Beziehungen zwischen ihnen in Abhängigkeit von Bewirtschaftungsmaßnahmen aufzeigen. Vor diesem Hintergrund wurde im Rahmen eines zweijährigen Feldversuches der Einfluss der Faktoren Klee/Gras-Saatmischungsverhältnis, Begleitgrasart und Bestandsalter auf Ertrag, Futterqualität, N2-Fixierungsleistung sowie auf Menge und Zusammensetzung der Ernterückstände von Rotklee/Gras untersucht. Die Faktoren Saatmischungsverhältnis, Begleitgrasart und... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover Pasture and forage crops Feeding and growth Cereals; Pulses and oilseeds. |
| Ano: 1998 |
URL: http://orgprints.org/2173/1/2173%2Dloges%2Dr%2D1998%2Dleguminosen%2Dertrag%2Dn2.pdf |
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| Loges, Ralf; Taube, Friedhelm. |
| Rotklee bzw. Luzerne als Reinsaat bzw. im Gemenge mit Gräsern stellen in zahlreichen ökologisch wirtschaftenden Betrieben die Basis der Winterfutterversorgung dar. Wenige vergleichende Untersuchungen liegen zum Leistungspotential von Rotklee und Luzerne unter mitteleuropäischen Klimaverhältnissen vor. Vor diesem Hintergrund wurde im Rahmen eines Feldversuches der Einfluß der Faktoren Leguminosenart (Rotklee, Luzerne), Leguminosen/Gras-Saatmischungsverhältnis (Leguminosereinsaat, Grasreinsaat, leguminosereiche bzw. leguminosenarme Saatmischung) sowie Begleitgrasart (Dt. Weidelgras, W.Weidelgras) auf die Parameter Ertrag, Leguminosenanteil sowie die Futterqualitätsparameter RP-Gehalt, Nettoenergiekonzentration, ADF-, und ADL-Gehalt untersucht. Im Mittel... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops Cereals; Pulses and oilseeds. |
| Ano: 1999 |
URL: http://orgprints.org/2154/1/loges%2D1999%2Dfutterqualitaet%2Drotklee%2Dluzerne%2Dgras.pdf |
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| Schmeer, Maria; Dittert, Klaus; Loges, Ralf; Taube, Friedhelm. |
| Aim of the presented study was the comparison of the specific emissions of CO2 equivalents of a legume based and a mineral N fertilised grassland considering the N2O emissions caused by N fertilisation and soil compaction. The field trial was set up on the experimental station “Hohenschulen” in northern Germany with the factors soil compaction, N fertilisation and experimental year. The N2O emissions were affected by an interaction of soil compaction and N fertilisation, especially under moist spring conditions. The specific CO2-equivalent emission per unit energy yield was 67 % higher for the mineral N-fertilised grassland compared to the legume based grassland. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2011 |
URL: http://orgprints.org/17590/3/Loges_17590.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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| Biernat, Lars; Loges, Ralf; Taube, Friedhelm. |
| Approximately 13 % of the total greenhouse gas emissions in Germany are caused by agricultural practices. From an environmental and economic point of view, gaseous N losses as well as nitrate leaching to groundwater play, a significant role. The aim of the present study is to analyze abiotic environmental effects of organic and conventional all-arable farming at a highly productive site in Northern Germany. Two different organic crop rotations with 25% vs. 40% legumes and no application of external N-fertilizers were compared over a two-year period to a typical site specific conventional rotation at an average mineral fertilser input of 195 kg N ha-1 a-1. For gas flux measurement, the closed-chamber method was applied. Nitrate leaching was measured by... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2015 |
URL: http://orgprints.org/27206/1/27206_biernat.pdf |
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| Krause, Tanja; Böhm, Herwart; Loges, Ralf; Taube, Friedhelm; Haase, Norbert U.. |
| The most organic produced potatoes are used for direct marketing or home requirements. But due to the growing demand for “Convenience-products” like potato crisps and chips the production of processing potatoes offers farmers an alternative. In contrast to conventional agriculture the nutrient supply in organic potato production must be secured by preceding crops or organic fertilization. Clover grass as preceding crop is common in praxis. But as the case may be how the clover grass is utilized (mulching, cut mowing) a different nitrogen fixation and mineralization is possible. In a period of two years (2003/2004) the effect of different clover grass management systems on yield, grading and quality of processing potatoes was under examination on the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health Root crops. |
| Ano: 2005 |
URL: http://orgprints.org/3607/1/3607.pdf |
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| Loges, Ralf; Kelm, Michael; Taube, Friedhelm. |
| Previous studies based on either small-scale plot experiments or modelling approaches, indicate a lower risk of nitrate leaching and a higher energy efficiency in organic than in conventional farming systems. Because there is still a lack of data measured at the farm scale, which also take farm type and farming practices into account, a comparison between an N-intensive non-organic, two organic all-arable crop rotations and a typical rotation of a mixed organic farm was carried out over a three-year period at a highly productive site in Northern Germany. Comparing the all-arable crop rotations, the organic systems had 70% lower potential yields than the regional typical conventional crop rotation. In spite of 60% lower input of fossil energy an N-intensive... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2008 |
URL: http://orgprints.org/12256/1/Loges_12256_ed.doc |
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| Registros recuperados: 58 | |
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