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| Registros recuperados: 34 | |
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| Knebl, Lucas; Blumenstein, Benjamin; Möller, Detlev; Wufka, André; Brock, Christopher; Gattinger, Andreas. |
| In einem Feldversuch auf zwei Standorten (Lehm, Sand) wurde in zwei Serien der Einfluss der Stroh-Aufbereitung auf dessen Umsatz im Boden untersucht. Die untersuchten Düngervarianten umfassten: Stroh (STR) sowie Stroh mit zusätzlicher Stickstoffgabe in Form von Hühnertrockenkot (STR+N), Rottemist (RM) und flüssigem, wie trockenem Gärrest (GRflüssig, GRtrocken) aus der Strohvergärung mit Hühnertrockenkot. Das Stroh der Varianten STR und STR+N wurde nach Ernte der Vorfrucht (Sommergetreide) eingearbeitet. Die restlichen Varianten wurden im Frühjahr appliziert. Um den Umsatz der Düngervarianten zu erfassen wurde die Produktion von CO2, N2O und CH4 in regelmäßigen Abständen an beiden Standorten gemessen. Zusätzlich erfolgte die Erhebung von Kohlenstoff- und... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover. |
| Ano: 2019 |
URL: http://orgprints.org/36243/1/Beitrag_319_final_a.pdf |
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| Knebl, Lucas; Leithold, Günter; Brock, Christopher. |
| Aim of the study was to determine to what extend data collected in a short term field experiment can be used in the validation of a humus balance model. The „hudycrop“ short term field experiment comprised different cropping systems with a uniform previous crop (spring barley), followed by winter wheat, potatoes, red clover (3 cuts/harvested or mulched), all without additional fertilizer application. The sampling design of the experiment was small scaled, assessing biomass as well as soil organic carbon (SOC) and soil total nitrogen (STN) changes (0 - 30 cm soil depth) in miniplots (each 1 m²). Soil organic matter (SOM) changes were calculated with consideration to bulk density. Parallel to this, SOM change, based on SOC and STN inputs and outputs, was... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover. |
| Ano: 2015 |
URL: http://orgprints.org/27253/1/27253_knebl.pdf |
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| Blumenstein, Benjamin; Brock, Christopher; Dannehl, Theresa; Möller, Detlev. |
| Management measures to maintain or increase soil organic matter (SOM) are generally associated with additional costs and a decreasing profitability of crop rotations. However, certain SOM-enhancing strategies may have the potential to synergistically optimize also the economic output in the short or long term. We evaluated several crop rotations and green/straw manuring systems on diverging site properties in stockless farm systems for their effects on production economics. Benefits may especially derive from an increased spatio-temporal synchronization of crop nutrient demand and nutrient supply by turning green manures into mobile fertilizers, which can even result in short term economic benefits. However, as effects do not necessarily show instantly,... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Soil biology. |
| Ano: 2017 |
URL: http://orgprints.org/31806/1/Humusersatzstrategien%20aus%20%C3%B6konomischer%20Perspektive1.pdf |
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| Brock, Christopher; Leithold, Günter. |
| Humus balances are tools for the assessment of humus management in farming practice. We evaluate the coefficients for organic farming systems that are comprised in the actual draft revision of the German standard method for humus balancing by VDLUFA. Specific coefficients for organic farming are supported by the N balance in the soil-plant system under organic management, and the coefficients under survey relate to plausible yield levels. The evaluation of the balances without and with application of farming-system specific coefficients in four organic long-term field experiments in Germany showed overall weak correlations of all balances with the test criteria soil C change, winter wheat yield level, and N balance, but balancing with specific coefficients... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop husbandry; Soil; Environmental aspects. |
| Ano: 2013 |
URL: http://orgprints.org/21587/1/21587_brock.pdf |
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| Dannehl, Theresa; Brock, Christopher; Leithold, Günter. |
| Stroh und Gründüngung stellen im Marktfruchtanbau die wesentlichen Substrate für die Versorgung der Böden mit organischer Substanz dar. Weitere organische Dünger sind zumeist nicht oder nur in geringem Umfang vorhanden. Diese Situation erfordert eine differenzierte Bewertung der Humusreproduktionsleistung von Stroh und Gründüngung. Im Rahmen des BÖLN-Projektes „Sicherung der Humusvorräte mit Grün- und Strohdüngung“ (2811NA061) wird u.a. geprüft, inwiefern die kombinierte Betrachtung der C- und N-Massenbilanzen eine anwendbare Option hierfür darstellt. Die Hypothese ist, dass sich das CN-Verhältnis im Substrat-Boden-Gemisch mittelfristig stets wieder einem standortspezifischen Wert annähert. Die Stabilisierung von Substrat-C im Boden wäre somit (u.a.) von... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Soil. |
| Ano: 2015 |
URL: http://orgprints.org/27223/1/27223_dannehl.pdf |
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| Brock, Christopher; Leithold, Günter. |
| We calculated humus balances for organic and conventional cropland in Germany and compared them to each other in order to find out whether organic farming comprises a better humus reproduction than conventional farming, as commonly assumed. Applying a dynamic humus balance model that was parametrized based on data from agrostatistical reports we yielded comparable balances for the two farming systems. The reason was mainly a considerably lower stocking on organic farms, and the low N supply. However: a superior cropland structure brought the balance to the same level as with conventional agriculture despite of these factors. Due to shortcomings in model parametrization caused by the available data base, results may not be over-interpreted. Still, it can be... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: "Organics" in general; Soil; Environmental aspects. |
| Ano: 2013 |
URL: http://orgprints.org/21557/1/21557_Brock.pdf |
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| Brock, Christopher; Fließbach, Andreas; Oberholzer, Hans-Rudolf; Schulz, Franz; Wiesinger, Klaus; Reinicke, Frank; Koch, Wernfried; Pallutt, Bernhard; Dittman, Bärbel; Zimmer, Jörg; Hülsbergen, Kurt-Jürgen; Leithold, Günter. |
| The aim of this study was to evaluate the interaction between yield levels of nonleguminous crops and soil organic matter (SOM) under the specific conditions of organic and conventional farming, respectively, and to identify implications for SOM management in arable farming considering the farming system (organic vs. conventional). For that purpose, correlations between yield levels of nonlegume crops and actual SOM level (Corg, Nt, Chwe, Nhwe) as well as SOM-level development were examined including primary data from selected treatments of seven long-term field experiments in Germany and Switzerland. Yield levels of nonlegume crops were positively correlated with SOM levels, but the correlation was significant only under conditions of organic farming, and... |
| Tipo: Journal paper |
Palavras-chave: Soil quality; Crop husbandry. |
| Ano: 2011 |
URL: http://orgprints.org/21782/1/brock-etal-2011-JPlantNutrSoilSci-Vol174-p568-575.pdf |
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| Brock, Christopher; Leithold, Prof. Dr. Günter. |
| The impact of management and environmental site factors on quantitative and qualitative indicators of humus dynamics was investigated in eight long-term field experiments in Germany and neighbouring countries. Humus dynamics were basically influenced by environmental site conditions, but at a given site differences between farming systems could be ascerted. Mixed farming systems with farmyard manure application as a rule had a more favourable impact on humus dynamics than stockless systems. Whether an advantageous performance of humus dynamics in organic farming as compared to conventional farming will occur or not, is dependent on the respective farm types of both systems that are related to each other. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Soil; Crop husbandry. |
| Ano: 2008 |
URL: http://orgprints.org/12536/1/Brock_12536_ed.doc |
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| Schulz, Franz; Brock, Christopher; Leithold, Günter. |
| An organic long-term field experiment has been carried out at the experimental station Gladbacherhof (Giessen University, Germany) since 1998 to survey the performance of agronomical, economical and ecological indicators dependant on farm type and tillage intensity. This article presents results on cash crop yields and changes in humus contents in the first two rotations of the experiment. It can be concluded that organic stockless farming without ley affects cash crop yields and demands special attention with regard to a sustainable humus management. Stockless farming with rotational ley on the other hand up to now showed a satisfactory performance when compared to a mixed farm type with livestock. As for the yields, reduced tillage systems could cope... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Crop combinations and interactions; Soil tillage. |
| Ano: 2008 |
URL: http://orgprints.org/11990/1/Schulz_11990_ed.doc |
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| Hillebrecht, Björn; Brock, Christopher; Leithold, Prof.Dr. Günter. |
| The aim of this work was to study seasonal changes of topsoil Ct and Nt contents in comparison with Ct and Nt mass changes. The survey was carried out under winter rye with succeeding catch crop. A special experimental design was chosen to minimize space/time interactions and prevent disturbance of sampling points at the same time. The observation of mass changes instead of content changes substantially improved the analytical quality of results in this study, which was in line with findings from the literature. It is concluded that considering bulk density should therefore be recommended as a standard procedure in surveys of soil Ct and Nt dynamics. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover. |
| Ano: 2009 |
URL: http://orgprints.org/14567/1/Hillebrecht_14567.pdf |
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| Brock, Christopher; Blumenstein, Benjamin; Dannehl, Theresa; Möller, Detlev. |
| An adequate supply of organic matter to arable soils is essential for the maintenance of soil productivity. Still, management implications can cause a trade-off with economics, as measures for soil organic matter management may not directly induce ecosystem services that increase the profitability of the system. This is especially true with regard to stockless organic farming systems, where well-proven measures, as the integration of fodder legumes in crop rotations, may not seem attractive with regard to the revenue. In this article we evaluate strategies for soil organic matter management in stockless organic farming systems based on scenarios for different soil-climate conditions in Germany to deal with this challenge. Several options to make use of... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Soil. |
| Ano: 2017 |
URL: http://orgprints.org/31808/1/322-325%20Optionen%20zur%20Sicherung%20der%20Humusversorgung%20im%20viehlosen%20%C3%96kolandbau.pdf |
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| Schulz, Franz; Brock, Christopher; Leithold, Günter. |
| Auf dem Lehr- und Versuchsbetrieb für Ökologischen Landbau der Universität Gießen, Gladbacherhof, wird seit 1998 ein zweifaktorieller Dauerfeldversuch durchgeführt. Es werden die Effekt von 3 verschiedenen Betriebssystemen (mit und ohne Viehhaltung) in Kombination mit 4 Bodenbearbeitungsvarianten auf Pflanzen, Boden und Umwelt untersucht. In diesem Beitrag werden die Ergebnisse der Beikraut-Deckungsgrade und des Artenspektrums präsentiert. Zusammenfassend kann festgehalten werden, dass die Deckungsgrade, verglichen mit konventionellen Schadschwellen, generell relativ niedrig waren und nur ein begrenztes Artenspektrum der Ackerbegleitflora gefunden wurde. Aufgrund der intensiven mechanischen Maßnahmen zur Beikrautregulierung hatten die Wildpflanzen keinen... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2015 |
URL: http://orgprints.org/27153/1/27153_schulz.pdf |
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| Brock, Christopher; Leithold, Prof.Dr. Günter; Schulz, Franz. |
| Year-to year changes of soil organic matter (SOM) have been surveyed in a long-term experiment in order to allow for crop/cropping system impact assessment. Legumes usually caused SOM build-up, which on the other hand only to a short extend remained during the succeeding years. Considerable SOM decrease could be found under potatoes. SOM dynamics under cereals varied strongly according to aspects of the respective cropping system, especially precrop and fertilization. Green manure but also farmyard manure obviously increased short-term decomposable fractions of SOM, promoting mineralization of SOM in the following period. Long-term changes of SOM in the experiment were somewhat less pronounced than year-to-year changes, pointing on the high... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Crop combinations and interactions. |
| Ano: 2009 |
URL: http://orgprints.org/14564/1/Brock_14564.pdf |
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| Brock, Christopher; Leithold, Günter. |
| Recently a revised version of the German standard method for humus balancing according to VDLUFA has been published. In contrast to the preceeding version, the method now shall be applicable not only in conventional, but also organic farming systems. In this contribution, we try to define the scope of the three levels of organic matter demand parameters for crops applied in the method, as an applicable definition is missing in the VDLUFA method description. We do so by calculating crop uptake of mineralized humus-N from the balance parameters, and by linking N uptake to yield levels of crops. Further, we calculate humus balances for farming system treatments in the Organic Arable Farming Experiment Gladbacherhof (Villmar,Germany) and test the ability of... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop husbandry; Soil; Environmental aspects. |
| Ano: 2015 |
URL: http://orgprints.org/27222/1/27222_brock.pdf |
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| Registros recuperados: 34 | |
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