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| Köpke, Prof. Ulrich; Schulte, Harald. |
| Field experiments carried out at two experimental sites over two years showed that temporary direct seeding (DS) of faba beans (FAB) is possible in Organic Agriculture (OA) when weed pressure of perennials is low. Weed density of DS treatments was significantly lower when compared with mouldboard plough (MP, control) although no clear effects on annual weeds were given by the precrop oats neither by the amount of crop residues (0, 4, 6 t ha-1) nor the sowing density of autumnal sown oats (0, 600, 1200, 1800 seeds m- ) simulating hail-shattered grains. No significant differences in grain yield but lower costs of labour and fuel were determined for DS compared with MP. Estimated DS gross margins exceeded MP gross margins when DS yield losses remained lower... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management; Soil tillage. |
| Ano: 2008 |
URL: http://orgprints.org/12379/1/Koepke_12379_ed.doc |
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| Fritz, Dr. Jürgen; Meißner, Georg; Athmann, Miriam; Köpke, Prof. Ulrich. |
| Ten encoded grape samples from 2006 were taken from a long-term field trial on the comparison of different organic and conventional production systems at Geisenheim, Germany. The samples were examined with the picture forming methods biocrystallization according to Pfeiffer, capillary dynamolysis according to Wala and circular chromatography according to Pfeiffer. The pictures of the encoded samples were i. differentiated and ii characterised. Two encoded samples of each of the five production methods ‘conventional’, ‘bio-organic’, ‘bio-dynamic without horn silica’,‘bio-dynamic with three horn silica applications’ and ‘bio-dynamic with four horn silica applications’ were clearly differentiated with highest accuracy, i.e. 100%. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2009 |
URL: http://orgprints.org/14283/1/Fritz_14283.pdf |
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| Sufyan, Muhammad; Neuhoff, Dr. Daniel; Köpke, Prof. Ulrich. |
| Wireworms, particularly Agriotes lineatus and A. obscurus are becoming a problem in organic crop production causing economically severe damage on potatoes and other arable crops. Since pesticide application for direct control is not allowed in organic farming, reliable methods for quantifying wireworm infestation levels and forecasting damage are urgently needed for any control strategy. In the present work, the assessment of the range of attractiveness of pheromone traps to male A. lineatus and A. obscurus beetles was investigated in 2006 and 2007. The results indicated that the trap recovery rate of released beetles was more dependent on release distance than on time. Recovery rates greater than 40% were only noted for short release distances (up to 10... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2008 |
URL: http://orgprints.org/12590/1/Sufyan_12590_ed.doc |
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| Fischer-Arndt, Meike; Neuhoff, Dr. Daniel; Köpke, Prof. Ulrich. |
| Quality requirements for raw edible produce like lettuces include nutritional value and hygienic quality. Organic lettuce is often considered to cause a potential health risk for immunocompromised individuals due to assumed pathogen transfer from organically manured soils into lettuce heads (Lactuca sativa, var. capitata). The effect of different weed management strategies (rotary tiller, mouldboard plough combined with flame weeding, plastic mulch and straw layer, resp.) on pathogen transfer from fresh and composted farm yard manure were assessed in four field experiments in 2006 and 2007. Results gave no hint on any pathogen transfer given by the assumed pathways (contaminated soil particles transported by mechanical tools and/or splash effect of rain... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2008 |
URL: http://orgprints.org/12547/1/Fischer%2DArndt_12547_ed.doc |
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