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| Registros recuperados: 44 | |
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| Haase, Thorsten; Schüler, Christian; Böhm, Herwart; Krause, Tanja; Loges, Ralf; Taube, Friedhelm; Heß, Jürgen. |
| Voraussetzungen für einen erfolgreichen Anbau von Verarbeitungskartoffeln sind außer einem hohen Ertrag vor allem die von der Kartoffel verarbeitenden Industrie geforderten produktspezifischen Qualitäten für Pommes frites und Chips. Für die Verarbeitung zu Pommes frites muss z.B. ein hoher Anteil großfallender Knollen realisiert werden oder bei Chipskartoffeln bestehen strenge Vorgaben für die Gehalte an reduzierenden Zuckern. Um hohe Zuckergehalte zu vermeiden, erfolgt die Kartoffellagerung bei 8°C, was erhöhte Ansprüche an die Lagerfähigkeit bedeutet. In dem gemeinsam von der Universität Kassel (FG Ökologischer Land- und Pflanzenbau, Projektleitung), der FAL (Institut für ökologischen Landbau), der Universität Kiel (Institut für Pflanzenbau und... |
| Tipo: Report |
Palavras-chave: Root crops. |
| Ano: 2005 |
URL: http://orgprints.org/13028/1/13028%2D03OE003%2Duni%2Dkassel%2Dhaase%2D2005%2Dverarbeitungskartoffeln.pdf |
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| Loges, Ralf; Taube, Friedhelm. |
| Knowledge about the amount of fixed nitrogen of different legume crops is very important for calculation of farm N balances. According to literature the choice of determination method may have an impact on the estimated amount of N fixed by a legume sward. The aim of the study was to compare the three most important field methods for determination of nitrogen fixation under different sward management systems. In the present study the natural 15N abundance method gave lower fixation rates than the two alternative methods (total-N-difference method and 15N enrichment technique). The determination of N fixation based only on N in harvestable plant material underestimated the amount of fixed N on average by 70 kg × ha-1 compared to techniques including also... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover Specific methods Cereals; Pulses and oilseeds. |
| Ano: 2002 |
URL: http://orgprints.org/2151/1/loges%2D2002%2Dmethod%2Dn%2Dfixation%2Dlegumes.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; Ingwersen, Kathrin; Taube, Friedhelm. |
| Die N2-Fixierungsleistung von Leguminosenbeständen ist eine wichtige Kenngröße in der Betriebs-N-Bilanz bzw. der Fruchtfolgeplanung landwirtschaftlicher Betriebe. Aus der Literatur ist bekannt, dass die gewählte Messmethode große Bedeutung für die Höhe der ermittelten N2-Fixierungsleistung von Leguminosen besitzt. Vor diesem Hintergrund wurden 3 alternative Feldmethoden zur Bestimmung der N2-Fixierung vergleichend geprüft. Als Versuchsbestände dienten Futterleguminosenbestände, die sich in den Faktoren Leguminosenart (Rotklee, Weißklee, Luzerne), Saatmischungsverhältnis (Leguminosenreinsaat, Gemenge mit Dt. Weidelgras) sowie Nutzungsart (Schnitt, Brache) unterschieden. Die N2-Fixierungsleistungen dieser Bestände wurden parallel mit Differenzmethode,... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover Specific methods Cereals; Pulses and oilseeds. |
| Ano: 2001 |
URL: http://orgprints.org/2147/1/loges%2D2001%2Dmethode%2Dstickstoff%2Dfixierung%2Dleguminose.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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| Taube, Friedhelm; Wachendorf, M.; Loges, R.. |
| Zusammenfassung: Aus aggregierter Sicht der pflanzenbaulichen Leistung wie des abiotischen Ressourcenschutzes ist festzuhalten: 1) der Futterbau auf den sandigen Standorten der Geest ist bei reduzierter N-Intensität durch geringe Grenzertragsverluste, aber hohe Reduktionen der Nitratauswaschungen geprägt; im Marktfruchtbau des östlichen Hügellandes herrschen inverse Beziehungen vor. 2) Ein Flächenbilanzsaldo von +20 bis +40 kg/ha/Jahr (plus "unvermeidbare gasförmige Verluste") ist als Grenzbereich der guten fachlichen Praxis auf den Futterbaubetrieben der Geest nur durch erhebliche Reduktionen der Bewirtschaftungsintensität zu erreichen. Auf den Marktfruchtbetrieben des östlichen Hügellandes besteht dagegen eine schwache Beziehung zwischen dem... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2001 |
URL: http://orgprints.org/2367/1/handbuch%2Dkein%2DDokument.pdf |
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| Hamacher, Maike; Loges, Ralf; Taube, Friedhelm. |
| Legumes and herbs are able to contribute to productivity and biodiversity in forage production. Besides they are known for beneficial properties for nutritive value and animal health. In the present study the potential yield and forage quality of eight legumes, four herbs and perennial ryegrass were tested under growing conditions in northern Germany. Due to their ability to bind protein and affect ruminal fermentation in a favourable manner, concentration of condensed tannins (CT) and total phenols (TP) were measured. Regarding some forage quality parameters, herbs and alternative legumes were equal or even exceed standard species. In general, herbs were lower in dry matter yield and crude protein, but higher in energy content and TP. Highest TP were... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops; Feeding and growth. |
| Ano: 2015 |
URL: http://orgprints.org/27259/1/27259_hamacher.pdf |
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| Taube, Friedhelm; Pötsch, E.M.. |
| A survey is presented on the impact of different intensities of grassland management related to nutrient balances and their assessment. With special reference to data from Austria and Germany, it is postulated that on-farm nutrient balance assessment is a valuable tool for identifying deficits in efficiency of nutrient use in the soil-plant-animal system. Farm gate balances can be used as indicators for Codes of Good Agricultural Practice in Europe, if input/output parameters and calculations are standardised and if acceptable surpluses are regionally validated. |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Pasture and forage crops. |
| Ano: 2001 |
URL: http://orgprints.org/2362/1/handbuch%2Dkein%2DDokument.pdf |
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| Loges, Ralf; Mauscherning, Inken; Taube, Friedhelm. |
| Under conditions with wet mild winters due to high nitrate leaching risk growing systems with high nitrogen (N) uptake efficiency in autumn are necessary, especially after pre crops with a high N release. In 2003 and 2004 a field trial was conducted in Northern Germany to investigate autumn N uptake and nitrate leaching in autumn sown winter wheat (Triticum aestivum L.) and winter oilseed rape (Brassica napus) grown intercropped with catch crops. Catch crops in pure stands were sown as control. In each system three catch crops common vetch (Vicia sativa), forage rape (Brassica napus) and oats (Avena sativa) were tested simultaneously. The experiment was run parallel after grass clover (high N status) and oats (low N status). N uptake, soil mineral nitrogen... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2008 |
URL: http://orgprints.org/12535/1/Loges_12535_ed.doc |
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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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| Krawutschke, Manuel; Weiher, Nina; Gierus, Martin; Thaysen, Johannes; Taube, Friedhelm. |
| Ensilage of red clover results in lower concentrations of non-protein nitrogen compared to other forage legumes. It is assumed that the polyphenol oxidase (PPO) activity in red clover is related to this effect. Therefore, a laboratory ensiling trial was carried out to quantify the changes in crude protein (CP) fractions during the ensiling process using the Cornell Net Carbohydrate and Protein System. At four cutting dates, fresh, wilted and ensiled herbage of three red clover genotypes and white clover grown in two systems (with and without mechanical stress) was sampled. The specific PPO activity was measured photometrically in fresh leaves of the plants. Concentrations of fraction A increased from 130-197 g/kg CP to 372-544 g/kg CP during the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops. |
| Ano: 2011 |
URL: http://orgprints.org/17345/3/Krawutschke_17345.pdf |
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| Biegemann, Thorsten; Loges, Ralf; Taube, Friedhelm. |
| An increased demand for renewable raw materials for food and energy production has led to an increased intensification of agricultural production in northern Europe. Grassland, as well as arable production, has been affected by this development. Extensive grassland swards are often renovated with the aim of improving herbage yield and quality. The renovation of grassland leads to a reduction of CO2-C-fixation rates and increased soil mineralization processes. As a result levels of carbon losses and nitrous oxide (N2O) emissions increased in the short-term [1, 2]. Few studies have been carried out on the development of soil carbon and nitrous oxide emissions in medium or long-term (>1 year). In order to identify carbon sequestration and N2O-emissions... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Air and water emissions. |
| Ano: 2013 |
URL: http://orgprints.org/21569/1/21569_Biegemann.pdf |
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| Biegemann, Thorsten; Loges, Ralf; Chen, Shimeng; Taube, Friedhelm. |
| Die Landwirtschaft trägt weltweit mehr als 50% zu den globalen N2O-Emissionen bei. Überwiegend entstehen diese durch Nitrifikation, Nitrifikation/Denitrifikation und Denitrifikation in gedüngten Böden. Die Verfügbarkeit von leicht mineralisierbarer organischer Substanz in Kombination mit einem hohen Boden-N-Angebot begünstigen vermutlich vor allem die heterotrophen Denitrifikanten, welche hypothetisch den größten Beitrag zu den N2O-Emissionen aus Böden leisten. Gewöhnlich führt die mechanische Bodenbearbeitung wie zum Beispiel der Grünlandumbruch zu einem gesteigerten Angebot an schnell mineralisierbaren Kohlenstofffraktionen und einer gesteigerten N-Mineralisation. Zur Einschätzung der N2O-Emissionen von einem ökologisch bewirtschafteten... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2011 |
URL: http://orgprints.org/17737/3/Biegemann_17737.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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| Bunne, Inga; Kluß, Christof; Loges, Ralf; Herrmann, Antje; Taube, Friedhelm. |
| Intensified agriculture is often associated with nitrous oxide (N2O) emissions and nitrate (NO3) leaching losses into groundwater due to high application rates of N-fertilizer, increasing maize cultivation and ploughing up permanent grassland. N2O is an important anthropogenic greenhouse gas and agriculture is one of the main polluters. NO3 leaching endangers groundwater quality. In a field experiment on the organically managed farm “Lindhof” in Northern Germany three different forage production systems (1. crop rotation, 2. continuous silage maize 3. permanent grassland) were established parallelly after a) ploughing up permanent grassland and b) longtime arable use. N2O emissions were measured weekly over the two-year experimental period. Soil water... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: "Organics" in general. |
| Ano: 2015 |
URL: http://orgprints.org/27208/1/27208_bunne.pdf |
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| Neumann, Helge; Loges, Ralf; Taube, Friedhelm. |
| A two-year comparative study on the abundance of breeding birds on conventional and organic arable fields was carried out in Northern Germany (federal state of Schleswig-Holstein). Birds were surveyed on 40 pairs of fields (conventional/organic), which were selected with regard to similar field sizes and comparable boundary struc-tures (hedges, shrubs). Averaged over two experimental years, skylarks (Alauda arvensis) as well as pheasants (Phasianus colchicus) occurred more often on organic fields, while yellow wagtails (Motacilla flava) reached higher abundances on conven-tional fields. Diversity of farmland birds was not affected by type of management. Concerning the regional threat of farmland bird species, organic farming might make a contribution to... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2007 |
URL: http://orgprints.org/9571/1/9571_Neumann_Vortrag.pdf |
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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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| Eickler, Birgit; Gierus, Martin; Taube, Friedhelm. |
| Several studies show that polyphenol oxidase (PPO) in red clover reduces proteolysis and increases nitrogen use efficiency of the ruminant, but not much is known about factors affecting PPO activity in red clover plants. PPO activity was analysed in red clover plants from legume-grass mixtures subjected to three different management systems. The cutting frequency (3 or 5 cuts) caused only minor differences in PPO activity, whereas a significant increase in PPO activity could be proved for the rota-tional grazing system (RG), compared to the simulated grazing system (SG, 5 cuts) with equal use frequency. Results indicate a metabolic adaptation of the red clover plants due to the grazing process itself, leading to a control factor which has to be considered... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Feeding and growth. |
| Ano: 2007 |
URL: http://orgprints.org/9597/1/9597_Eickler_Vortrag.pdf |
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| Registros recuperados: 44 | |
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