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| Kelm, Dr. Michael; Loges, Dr. Ralf; Taube, Prof. Dr. Friedhelm. |
| Nutrient balances are important agri-environmental indicators, which describe the magnitude of potential nutrient losses from farming systems to the environment. In order to analyze production systems at the entire farm scale, nitrogen balances and other agri-environmental indicators were assessed on 32 organic and conventional farms in Northern Germany. On organic farms, nitrogen fixation of legumes was determined on representative fields. Irrespective of the specialization (all-arable farms, dairy farms), nitrogen surpluses were always pronouncedly lower on organic farms compared to conventional farms. Organic farms generally conducted a sustainable nutrient management. However, the total nitrogen supply at the farm scale was not sufficient on many... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2007 |
URL: http://orgprints.org/11004/1/231_9707_Kelm_N%2DBilanzen.pdf |
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| Schleuß, Dr. Uwe; Böhm, Dr. Herwart; Loges, Dr. Ralf. |
| There is a great requirement for cultivation of grain legumes (e.g. peas) in organic farming systems (protein supply for animals, biological nitrogen fixation, previous crop effects). The occurrence of pests and diseases, e.g. Acyrthosiphon pisum, leads to strong yield losses and yield fluctuations. In organic farming systems the use of plant protection products is strongly limited. Plant strengthening products are compatible to this kind of land use and enhance the resistance of plants to harmful organisms. Field trials with some selected plant strengthening products achieve small yield growth under North-German site and climatic conditions, but rarely it is possible to produce statistical evidence. At low up to medium level of disease attack they show... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Cereals; Pulses and oilseeds. |
| Ano: 2005 |
URL: http://orgprints.org/3537/1/3537.pdf |
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| Kelm, Dr. Michael; Loges, Dr. Ralf; Taube, Prof. Dr. Friedhelm. |
| Nutrient management is a key factor for both economic viability and environmental performance of farming systems. On 32 representative conventional and organic farms in Northern Germany, nutrient management was analyzed in the interdisciplinary monitoring project “COMPASS”. Organic farms had significantly lower nitrogen (N) surpluses compared with conventional farms. The majority of organic farms had very low or even negative N surpluses, indicating insufficient N supply in the cropping system. Nitrogen leaching, however, was too high in many cases on both conventional and organic farms. Strategies for a more targeted nutrient supply in organic farming need to be developed and implemented. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2008 |
URL: http://orgprints.org/11679/1/11679.pdf |
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| Haase, Dipl.Ing. agr Thorsten; Krause, Dipl.Ing. agr Tanja; Heß, Prof. Dr. Jürgen; Böhm, Dr. Herwart; Loges, Dr. Ralf; Haase, Dr. Norbert. |
| Previous experiments (2000-2001) suggested a strong impact of the site on which organic potatoes are cultivated on the quality of tubers for processing to crisps. In 2003 and 2004, six varieties were selected to be examined consequently on three different sites. Total and graded yield was affected by variety and site. Dry matter content of all varieties was on each site above the required level of 235 %. Reducing sugar content of tubers after harvest was very low and crisps quality very high, only after a storage period varieties could be differentiated. Cautious recommendations of varieties for organic crisp production are given in the paper. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Root crops. |
| Ano: 2005 |
URL: http://orgprints.org/3831/1/3831.pdf |
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| Westphal, M.Sc. Derk; Loges, Dr. Ralf; Taube, Prof. Dr. Friedhelm. |
| Management factors like the type of defoliation and seed mixture influence yield and forage quality of grass clover mixtures. In comparison to harvesting, grazing is less cost intensive. For economical reasons a maximum duration of grazing period is required. Grazing over winter can cause pasture damages. This problem is of minor relevance for grass clover grown on arable land in the last production year, which is ploughed in the following spring. This study compares different grass clover mixtures concerning yield, forage quality and suitability for winter grazing.With this background, tall fescue exerted more significant effect on the dry matter yield than perennial ryegrass. White clover showed significant superiority over all the other tested species,... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Feeding and growth. |
| Ano: 2008 |
URL: http://orgprints.org/12385/1/westphal_12385_ed.doc |
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| Neumann, Dr. Helge; Bisschop-Larsen, Leif; Loges, Dr. Ralf; Taube, Prof. Dr. Friedhelm. |
| A comparative study of breeding bird communities of organically and conventionally cultivated arable fields was carried out in northern Germany in 2005. The research was conducted on 40 pairs of fields (conventional/organic), which were selected with regard to similar field sizes and comparable boundary structures (particularly presence of hedges). Bird communities were solely dominated by the skylark Alauda arvensis L., which was the only frequent species on the tested pairs of fields. Diversity of farmland birds (number of species, Shannon-Index) was not affected by type of management. However, the abundance of skylarks (territories/10 ha) was significantly higher in organic than in conventional fields. As the study will be continued, the one-year... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services; Crop husbandry. |
| Ano: 2006 |
URL: http://orgprints.org/7469/1/Neumann_et_al_Odense_2006.pdf |
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| Loges, Dr. Ralf; Henriksen, John. |
| Ecologically grown medicinal plants containing bioactive compounds hold great potential as high-value niche crops for farmers. However, the way to grow these plants differs from traditional crops. Growing techniques, harvest methods and post-harvest handling of the raw material plays a crucial role regarding the quality of the raw material that the farmers can offer. The purpose of a new research project financed by EU-Interreg IIIA programme is among other things to carry out production, harvest and processing experiments with plants containing bioactive plant compounds that hold a preventive effect towards diabetes II. One of the project’s goals is to draw up cultivation instructions for the primary producers to use when cultivating the plants in... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Processing; Packaging and transportation Crop husbandry. |
| Ano: 2006 |
URL: http://orgprints.org/7581/1/Plants_for_health_by_Ralf_Loges_and_John_Henriksen.doc |
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| Neumann, Dr. Helge; Loges, Dr. Ralf; Taube, Prof. Dr. Friedhelm. |
| Habitat quality of different arable crops for skylarks (Alauda arvensis) was analysed in a three year field study on 12 organic farms in northern Germany. Grass clover, spiked spring cereals (barley/spelt/wheat), winter wheat as well as grain legumes (including mixtures) hold constant abundances of skylarks during the whole breeding period. In spring oats, winter spelt and winter cereals with awn (barley/rye), however, skylark densities decreased during the breeding time, which might be explained by comparatively taller and/or denser vegetation structure of theses crops during June/July. Crops showed no significant differences in maximum abundances of skylarks. Concerning possible effects on breeding success, harrowing and/or hoeing of cereals and... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2009 |
URL: http://orgprints.org/14369/1/Neumann_14369.pdf |
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