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| Registros recuperados: 18 | |
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| Athmann, Miriam; Fetscher, Johannes; Zemke, Daniel; Kautz, Timo; Köpke, Ulrich. |
| Biopores have been shown to be enriched with plant available nutrients as compared to the surrounding bulk soil and therefore are considered hot spots for the nutrient acquisition especially in the otherwise nutrient-poor subsoil. As a result of colonization of biopores by earthworms, pore walls are enriched with nutrients. In this study, a first attempt was made to assess the influence of earthworm abundance on both structural pore wall characteristics as assessed with in situ endoscopy and on pore wall C and N contents. Higher earthworm density resulted in higher N contents and significantly higher C contents in biopore walls as compared to the surrounding bulk soil, regardless whether they showed visible earthworm coatings. In the treatment with lower... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Soil biology; Soil. |
| Ano: 2015 |
URL: http://orgprints.org/27215/1/27215_athmann.pdf |
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| Fritz, Jürgen; Athmann, Miriam; Köpke, Ulrich. |
| By combined application of the three picture forming methods biocrystallization ac-cording to Pfeiffer, capillary dynamolisis according to Wala and circular chromatogra-phy according to Pfeiffer encoded food samples from different production systems have been repeatedly differentiated and identified by Dr. Ursula Graf. In the present study we tested whether by using the combined three picture forming methods en-coded food samples from different production systems could also be differentiated and identified in a different laboratory by another trained person. Ten encoded wheat samples each from 2000 and 2005 harvests were taken from the long-term DOK- trial in Oberwil/Switzerland and examined with the pictomorphological methods. The wheat samples derived... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2007 |
URL: http://orgprints.org/9568/1/9568_Fritz_Poster.pdf |
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| Kautz, Timo; Athmann, Miriam; Köpke, Ulrich. |
| Large sized, vertical biopores can provide preferential pathways for root growth, hence facilitating the exploration of great soil depths by crop roots. This is of particular importance for organic production systems, where crops are more dependent on nutrient acquisition from the solid soil phase than under conditions of mainstream agriculture. The relevance of biopores for nutrient acquisition from the subsoil can possibly depend on their individual properties. The aim of this study was to test how different chemical pore wall properties affect the growth of barley (Hordeum vulgare L.) roots in large sized biopores. Bulk soil, pore wall material and roots from individual biopores were collected from three depth layers in 45-75 cm soil depth. C and N... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil biology Cereals; Pulses and oilseeds Nutrient turnover. |
| Ano: 2014 |
URL: http://orgprints.org/23806/1/23806_MM.pdf |
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| Athmann, Miriam; Blasco, Irene; Köpke, Ulrich. |
| Effects of nitrogen supply (high / low), fertilizer type (biodynamic / organic / mineral) and application of the biodynamic horn silica preparation on nitrate, ascorbic acid and glucosinolate contents of rocket (Eruca sativa L.) were studied under conditions of full sunlight (100% photosynthetically active radiation PAR) and shading (55% PAR). Nitrate contents increased in response to shading and under conditions of full sunlight also in response to high nitrogen supply and mineral fertilization. Ascorbic acid contents were significantly higher with low nitrogen supply, biodynamic and organic fertilization, horn silica application and under conditions of low nitrogen supply with full sunlight. Glucosinolate contents were significantly increased by low... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2011 |
URL: http://orgprints.org/17722/3/Athmann_17722.pdf |
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| Fritz, Jürgen; Meißner, Georg; Athmann, Miriam; Köpke, Ulrich. |
| 33 encoded grape samples from 2007-2010 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 image forming methods biocrystallization, capillary dynamolysis and circular chromatography. The pictures of the encoded samples were i. differentiated and ii. characterised. The origin of 31 out of 33 encoded samples derived from ‘conventional’, ‘bio-organic’, ‘bio-dynamic‘ production was determined with highest accuracy. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2013 |
URL: http://orgprints.org/21636/1/21636_fritz.pdf |
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| Athmann, Miriam; Kautz, Timo; Köpke, Ulrich. |
| Das Ziel dieser Studie war, die Auswirkungen großlumiger Bioporen und Bodennährstoffgehalte auf Nodulation von Luzerne Wurzeln zu quantifizieren. In einem Feldversuch auf einem tiefgründigem Lössboden wurde Luzerne (Medicago sativa L.) angebaut (i) auf nativem, nährstoffreichem Boden oder in Parzellen, auf denen der native Boden entfernt und mit Boden aus ungedüngten Parzellen eines Dauerfeldversuchs ersetzt wurde sowie (ii) nach Anbau bioporen-generierenden Wegwarte (Cichorium intybus L.) mit Pfahlwurzelsystem oder nach Rohrschwingel (Festuca arundinacea Schreb.) ohne Pfahlwurzeln. Wurzellängen-Dichte und Nodulation wurden mit der Profil-Wand-Methode und an Monolith Proben quantifiziert. Spross-Wachstum und Nährstoff-Aufnahme von Luzerne wurde durch... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds. |
| Ano: 2019 |
URL: http://orgprints.org/36207/1/Beitrag_280_final_a.pdf |
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| Athmann, Miriam; Fritz, Jürgen; Köpke, Ulrich. |
| For spring wheat and rocket lettuce, the influence of light intensity, N supply and fertilizer type on product quality was investigated. The quality assessment, based on morphological parameters, chemical compounds related to growth and differentiation, and image forming methods, is considered as an appropriate approach for Organic Agriculture. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health Crop health; Quality; Protection. |
| Ano: 2011 |
URL: http://orgprints.org/23860/1/Athmann_FQH_abstract.doc |
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| Fritz, Jürgen; Athmann, Miriam; Meissner, Georg; Köpke, Ulrich. |
| Nine encoded wine samples from a German long-term field trial on the comparison of different cultivation systems were examined with the image forming methods biocrystallization, capillary dynamolysis and circular chromatography. The images of the encoded samples were i. differentiated into three groups of images with similar form expression, ii. characterised as ‘fresh – aged’ based on a catalogue of reference images, iii. ranked (according to the quality characterization) and iv. assigned to the different cultivation systems (classified). Images gained with samples from integrated farming showed more structures indicating enhanced degradation compared with the samples from organic and especially from biodynamic origin. Based on these observations, a... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2015 |
URL: http://orgprints.org/27103/1/27103_fritz.pdf |
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| Kautz, Timo; Athmann, Miriam; Köpke, Ulrich. |
| The subsoil (i.e. the soil beneath the ploughed soil layer) provides a large potential reservoir of nutrients for crops but the conditions for nutrient acquisition are generally adverse due tolow organic matter contents, low nutrient concentration in the soil solution, low microbial activity and high bulk density. However, the structural heterogeneity of the subsoil including biopores created by roots and earthworms requires a more detailed view on nutrient acquisition processes. First results from the DFG research unit ‘Crop Sequence and the Nutrient Acquisition from the Subsoil’ have shown that cultivation of perennial fodder crops with taproot systems can result in enhanced biopore density in the subsoil and increased root-length density of subsequent... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Soil. |
| Ano: 2013 |
URL: http://orgprints.org/21629/1/21629_Kautz.pdf |
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| Fritz, Jürgen; Athmann, Miriam; Köpke, Ulrich. |
| Ten encoded wheat samples from 2008 were taken from a field trial on the comparison of different organic and conventional production systems at Hennef, Germany. The samples were examined with the image forming methods biocrystallization, capillary dynamolysis and circular chromatography. The images of the encoded samples were a) characterised and b) assigned to experimental factors. The factors investigated were i) nitrogen supply, ii) fertilizer type, and iii) horn silica application. The ten samples were assigned 100% correctly to low and high N supply. Within the production methods, samples were assigned correctly to mineral fertilization and manure fertilization. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2013 |
URL: http://orgprints.org/21637/1/21637_fritz.pdf |
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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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| Athmann, Miriam; Kautz, Timo; Huang, Ning; Köpke, Ulrich. |
| Biopores have been shown to be enriched with plant available nutrients as compared to the surrounding bulk soil and therefore are considered hot spots for the nutrient acquisition especially in the otherwise nutrient-poor subsoil. However, depending on their individual biography, i.e. colonization by plant roots or earthworms, different nutrient status can be assumed. In this study, individual biopores were characterized with respect to signs of earthworm passage using in situ endoscopy, a non-destructive technique for display of pore wall characteristics. Subsequent sampling and analysis of biopore linings and blockages revealed that only biopores with visible earthworm coatings had significantly higher C and N contents as compared to the surrounding bulk... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality. |
| Ano: 2014 |
URL: http://orgprints.org/23878/1/23878_Athmann%20et%20al_MM.pdf |
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| Fritz, Jürgen; Athmann, Miriam; Meissner, Georg; Köpke, Ulrich. |
| Nine encoded wine samples from a German long-term field trial on the comparison of different cultivation systems were examined with the image forming methods biocrystallization, capillary dynamolysis and circular chromatography. The images of the encoded samples were i. differentiated into three groups of images with similar form expression, ii. characterised as ‘fresh – aged’ based on a catalogue of reference images, iii. ranked (according to the quality characterization) and iv. assigned to the different cultivation systems (classified). Images gained with samples from integrated farming showed more structures indicating enhanced aging compared with the samples from organic and especially from biodynamic origin. Based on these observations, a correct... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2014 |
URL: http://orgprints.org/24044/1/24044_Fritz%20et%20al_MM.pdf |
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| Fritz, Jürgen; Athmann, Miriam; Köpke, Ulrich. |
| Ten encoded rocket samples from 2009 were taken from a field trial on the comparison of nitrogen supply and different organic and conventional production systems at Hennef, Germany. The samples were examined with the image forming methods biocrystallization according to Pfeiffer, capillary dynamolysis according to Wala and circular chromatography according to Pfeiffer. The images of the encoded samples were a) characterised and b) assigned to experimental factors. The factors investigated were i) nitrogen supply, ii) fertilizer type, and iii) horn silica application. The ten samples were assigned 100% correctly to low and high N supply, to mineral fertilization and manure fertilization and to with or without horn silica application. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health. |
| Ano: 2011 |
URL: http://orgprints.org/17719/3/Fritz_17719.pdf |
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| Athmann, Miriam; Kautz, Timo; Köpke, Ulrich. |
| More information on root growth in biopores is needed for quantifying nutrient acquisition from the subsoil. The article presents an approach for using in situ endoscopy in biopores that allowed to quantify root-soil contact and detect differences in root morphology and orientation between mallow (Malva sylvestris L.) and spring wheat (Triticum aestivum L.). While 85 % of all wheat roots entered the biopores laterally from the bulk soil, mallow roots in biopores grew predominantly (69 %) with vertical orientation and established contact to the pore wall predominantly via lateral roots. The current status and future perspectives of the method are discussed. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop husbandry; Soil. |
| Ano: 2013 |
URL: http://orgprints.org/21625/1/21625_Athmann.pdf |
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| Kautz, Timo; Urbanska, D.; Athmann, Miriam; Dahn, C.; Täufer, Frank; Köpke, Ulrich. |
| Taprooted crops create large sized biopores in the subsoil which in turn facilitate root growth of following crops. To date it was unclear, over which periods of time biopores created by taproots remain stable. This study based on a long-term field experiment provides evidence that soil physical effects of taprooted chicory are persistent even 6 years after cultivation. Moreover, repeated cultivation of taprooted crops probably has cumulative beneficial effects on soil structure. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil biology; Nutrient turnover; Crop husbandry. |
| Ano: 2017 |
URL: http://orgprints.org/31555/1/Persistenz%20bodenphysikalischer%20Wirkungen%20perennierender.pdf |
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| Registros recuperados: 18 | |
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