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| Registros recuperados: 12 | |
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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; 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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| Perkons, Ute; Küpper, Paul Martin; Kautz, Timo; Köpke, Ulrich. |
| Biopores act as pathways for the roots of following crops to access water and nutrients stored in the subsoil. Their role for nutrient management is especially important under the conditions of Organic Agriculture. In a field trial on Haplic Luvisol, chicory (Cichorium intybus L., tap root system) and tall fescue (Festuca arundinacea, fibrous root system) were grown as precrops. Effects on biopore density, root-length density (RLD), leaf area index (LAI), biomass, transpiration and photosynthesis of following winter barley (Hordeum vulgare L.) were measured. Biopore density and RLD declined with soil depth. In all depth levels biopore density was higher after chicory in comparison to fescue. Between 95 and 125 cm soil depth the difference was significant.... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop husbandry; Soil. |
| Ano: 2013 |
URL: http://orgprints.org/21634/1/21634_Perkons.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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| Kautz, Timo; Lee, J.; Görtz, M.; Täufer, Frank. |
| We tested the effect of sampling time on the efficiency of mustard extractions for earthworms in a field study. On an organic experimental farm (alluvial loams; Hennef/Germany) earthworm extractions were started on two consecutive days hourly from 10 am to 5 pm and 6 pm respectively. Significant effects of daytime on extracted earthworm biomass occurred on both days. Maximum biomass was extracted in the early afternoon in each case. Additional pot experiments have shown a significant temperature dependence of the mustard extraction method which at least partially explains the differences in on-site extracted earthworm biomass in the course of the day. We conclude that daytime has to be considered as a factor when using mustard extraction methods. When used... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil biology. |
| Ano: 2011 |
URL: http://orgprints.org/17709/3/Kautz_17709.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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| 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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| Perkons, Ute; Kautz, Timo; Köpke, Ulrich. |
| Little is known about root growth in biopores. The aim of this study was to quantify differences of root-length density (RLD) in biopores between a tap root system (mallow) and a fibrous root system (wheat). A field experiment was undertaken near Bonn, Germany on a Haplic Luvisol developed from loess. Lucerne (Medicago sativa L.) and chicory (Cichorium intybus L.) were grown as precrops in a field trial followed by spring wheat (Triticum aestivum L.) and mallow (Malva sylvestris L.). Biopore density was measured on horizontal areas of 50 x 50 cm. RLD was estimated using the profile wall method to 160 cm soil depth. Roots growing in biopores with a diameter > 2 mm were recorded separately from the roots in the bulk soil. Biopore density was higher... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions Cereals; Pulses and oilseeds. |
| Ano: 2014 |
URL: http://orgprints.org/23996/1/23996%20Perkons_et_al_final_MM.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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| 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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| Kautz, Timo; Rauber, Rolf. |
| Organic manuring with slurry from biogas plants may contribute to plant nutrition and maintenance of soil fertility in organic farming. However, the chemical properties of biogas slurry depend markedly on substrate input and process technology. The aim of this study was to gain more insights into the relationship between the quality of biogas slurry and its influences on plant and soil parameters when applied as organic ma-nure. We studied the effects of slurries from two different biogas plants on yield of maize and soil microbial activity in a two-year field experiment. The investigation took place on a loam-clay soil near Göttingen, Lower Saxony. Biogas slurry A was obtained from a biogas plant with liquid pig manure as main input, slurry B originated... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil biology; Composting and manuring. |
| Ano: 2007 |
URL: http://orgprints.org/9854/1/9854_Kautz_Vortrag.pdf |
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| Registros recuperados: 12 | |
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