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| Registros recuperados: 34 | |
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| Brock, Christopher; Hoyer, Uta; Leithold, Günther; Hülsbergen, Kurt-Jürgen. |
| Humus balances provide a profitable approach for humus dynamics assessment in farming practice. Nevertheless, there is a clear demand for methodological adaptation. This article presents a new approach to humus balancing using reproducible algorithms for the estimation of balance coefficients. Humus balance coefficients for crops and organic fertilizers are estimated according to a bipartite algorithm. Humus demand is calculated on the basis of crop yields referring to the nitrogen household in the plant-soil system. Humus supply is derived from organic matter input with plant material and fertilizers. The new approach facilitates the adaptation of the method to new situations. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality. |
| Ano: 2008 |
URL: http://orgprints.org/12077/1/Brock_12077_ed.doc |
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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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| 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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| 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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| Schulz, Franz; Brock, Christopher; Leithold, Günter. |
| An organic long-term-field experiment with two factors has been carried out since 1998 at the experimental station Gladbacherhof, University of Giessen. Effects of different crop rotations combined with tillage treatments (mouldboard plough, twolayer- plough and tillage without plough) on plants, soil and weeds have been investigated. This article presents results on cash crop yields and weeds according to soil tillage. It can be concluded that, as for the yields, reduced tillage systems could cope with the regularly ploughed reference system if at least a shallow soil inversion was carried out. Concerning the lower yields in the soil tillage system without ploughing the impact of nutrient availability seems to be more important than the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Crop combinations and interactions; Weed management; Soil tillage. |
| Ano: 2009 |
URL: http://orgprints.org/14272/1/Schulz_14272.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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| Schulz, Franz; Brock, Christopher; Leithold, Günter. |
| Auf dem Lehr- und Versuchsbetrieb für Ökologischen Landbau der Universität Gießen, Gladbacherhof, wurde seit 1998 ein 2-faktorieller Dauerfeldversuch durchgeführt. Der Einfluss verschiedener Fruchtfolgen und unterschiedlicher Systeme der Grundbodenbearbeitung (konventioneller Streichblechpflug, Zweischichtenpflug und pfluglose Bearbeitung) auf Pflanzen, Boden und Umwelt wurden untersucht. In diesem Artikel werden die Ergebnisse von Pflanzenerträgen und mehreren Bodenparametern bezüglich der Bodenbearbeitung vorgestellt. Zusammenfassend kann festgehalten werden, dass diejenigen Bodenbearbeitungssysteme, die eine Bodenwendung beinhalten, ertraglich auf einem Niveau liegen. Die Ursache für geringere Erträge in dem pfluglosen System scheint in der... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil tillage. |
| Ano: 2011 |
URL: http://orgprints.org/17595/3/Schulz_17595.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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| 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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| Brock, Christopher; Leithold, G.. |
| Humus balances are intended to serve as instruments to support humus management in practice. Still, urgent need for adaptation especially with regard to apllication in organic farming has been stated. Results presented in this paper show that there in fact is a difference in humus repro-duction between conventional and organic farming that is not recognized in balance methods. In addition, the results exhibit a big uncertainty in balance results. They are pointing out basic problems of humus balance methods that are likely to be caused by an insufficient consideration of site-specific factors of the humus household and their interaction with farming. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality. |
| Ano: 2007 |
URL: http://orgprints.org/9348/1/9348_Brock_Vortrag.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; Dannehl, Theresa; Blumenstein, Benjamin; Möller, Detlev. |
| Soil organic matter management is a challenge especially in stockless organic farming systems, as shares of fodder legumes in crop rotations are often small to provide more cash crop area, and farmyard manure as the most valuable source for organic matter supply to soils is not available. However, there are many different options for stockless farms to tackle this challenge. In this article we discuss strategies for organic matter supply to soils based on scenarios for different soil-climate regions in Germany. We conclude that the integration of fodder legumes into crop rotations is the most valuable option, as these crops do not only provide carbon but are able to replace mineralized soil organic matter nitrogen that has been exported with the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Soil. |
| Ano: 2017 |
URL: http://orgprints.org/31807/1/Humusersatzstrategien%20im%20viehlosen%20%C3%96kolandbau.pdf |
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| Schulz, Franz; Brock, Christopher; Leithold, Günter. |
| Stockless management is increasing even in organic farming, but it is not known until now, whether organic matter supply is sufficient in such systems, or which measures are necessary to achieve a sustainable soil organic matter (SOM) management. Results from the long-term Organic Arable Farming Experiment Gladbacherhof (OAFEG) show that after two 6 y rotations, only a “mixed farm” treatment (MF) with fodder legumes in the rotation and cattle manure application corresponding to 1 LU ha-1 was able to maintain, and in the long term perhaps increase, SOM levels. The “stockless farm” with fodder legumes as green manure ley (SFL) was barely able to maintain the SOM level, while the “stockless cash crop farm” where organic matter supply relied on green manure... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Crop combinations and interactions; Nutrient turnover. |
| Ano: 2014 |
URL: http://orgprints.org/23963/1/23963_MM.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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| Registros recuperados: 34 | |
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