Browsing Naturwissenschaften, Mathematik und Informatik by Referee "Isselstein, Johannes Prof. Dr."
Now showing items 41-60 of 60
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Tiergesundheit in der ökologischen Milchviehhaltung - Status quo sowie (Weiter-) Entwicklung, Anwendung und Beurteilung eines präventiven Konzeptes zur Herdengesundheitsplanung
(2012-08-09)The prevention of animal health problems is crucial in organic livestock farming: this may be achieved by choosing appropriate animal housing conditions as well as suitable breeds and, offering high quality feedstuffs, ... -
Effects of agricultural management and manipulated plant species composition of permanent grassland on productivity and sward structure
(2012-05-04)The relationship between biodiversity and ecosystem functions of grasslands has received increasing attention in recent years. Scientists have sought to disentangle this complex relationship by sown biodiversity experiments ... -
Weaning and castration in beef calves
(2011-10-17)The present work included three trials to investigate the effects of abrupt separation on male and female beef calves of different ages (Trial 1; n=80) and the impact of the timing of this ... -
The effect of grassland botanical composition and (co-) grazing cattle and sheep on herbage production and sward nutrient utilisation
(2011-09-13)Plant diversity in grassland ecosystems has recently gained increasing interest, as plant diversity has often been found to be related to improved ecosystem functioning. So far, studies of ... -
Evaluierung von Winterackerbohnen als Zwischenfrucht für eine ökologische Biogasproduktion
(2010-09-08)Evaluation of winter faba bean as a first crop in a double-cropping system for an ecological biogas production By means of biogas utilization, renewable energy can be produced with high ... -
Einfluss von Aussaatstärke, Bodenbearbeitung und Anbaumuster auf den Ertrag von Erbsen-Hafer-Gemengen
(2010-06-16)In a two-year field experiment (2002/2003) on a loess soil near Göttingen, pea and oat were grown as sole and intercrops at a range of densities. The trial was carried out under conventional ... -
TRANSFER AND TRANSFORMATION OF AGRI-ENVIRONMENTAL SCHEMES: IMPLEMENTING INNOVATIVE EUROPEAN MODELS IN ISRAEL
(2009-11-30)The aim of the study is to explore the conditions for introducing market-oriented agri-environmental measures into Israel, and gain some insights to the possibility of their implementation ... -
Die Bedeutung der CO2-Fixierung von Leguminosenknöllchen für ihre Aktivität und Effizienz
(2009-10-09)The present work reports results from experiments on the influence of CO2 fixation for the N2 fixation in root nodules of legumes (Pisum sativum L. and Medicago sativa L.). It was shown ... -
Spatial aggregations in annual wild plant communities: Competition, Performance, and Coexistence
(2009-03-16)Biodiversity in agroecosystems has been declining at an alarming rate. Already in 1982, 15 of the 93 arable wild plant species listed in the German Red Data Book were extinct, which equalled ... -
Kombination von FADN- und IFCN-Datensätzen in der Politikfolgenanalyse - untersucht am Beispiel der EU-Milchmarktpolitik
(2008-11-26)An important task in scientific policy consulting is to estimate how agricultural policy reforms and changing framework conditions impact farms and to what extent the farms can adjust. ... -
Untersuchungen auf wasserlösliche Kohlenhydrate, Ertragsleistung und Inhaltsstoffe bei Futtergräsern zur Verbesserung der Verdaulichkeit
(2008-07-29)High sugar perennial rye-grass are new varieties from that an improved fodder quality an especially enhanced digestibility is expected. The aim of this study was to determine experimentally ... -
Nahinfrarotspektroskopische Erfassung und Charakterisierung der nutritiven und fermentativen Qualität von Grassilage im ungetrockneten Zustand
(2008-02-26)Grassland and forage crop farms are faced with the challenge of cost-efficient production of farm-produces feed for the ruminant feeding. The objective of this work is to reach a time and cost reduction through the use ... -
Genetic diversity based on SSR markers, heterosis and yield performance of Brassica rapa for biomass production
(2008-02-14)Biogas production has recently become of major interest in Europe. The substrate mainly used is biomass from energy crops and 2% of agricultural land in Germany is presently used for the cultivation of energy crops. ... -
Junge Erwachsene als Zielgruppe für den Bio-Markt
(2007-12-07)This study investigates young adults as a target fort he organic food market. The recent growth of the organic market was accompanied by a change in it s consumers. Unlike in the beginning ... -
Plant communities in land-use systems of coastal Ecuador: diversity patterns, endemism, and species turnover at landscape scale
(2006-05-23)Fragmentation and destruction of once continuous natural vegetation are major threats to biological diversity. Since preservation of biodiversity can not only be realized through the ... -
Aktualisierung der Bodenschätzung unter Berücksichtigung klimatischer Bedingungen
(2006-02-23)The German land appraisal (Reichsbodenschätzung) is based on net return (return on asset and land) ratios between different soils. It has been developed over 70 year ago, since then, net ... -
Untersuchungen zur Variabilität und Kausalität des potentiellen Nitrataustrages beim Anbau von Zea mays in Deutschland.
(2005-03-29)The objective of this work was to analyse and determine the impact of important management and soil and site-related factors and their interactions on the risk for nitrate leaching following ... -
Verhalten von ausgewählten Tetrazyklinen und Sulfonamiden in Wirtschaftsdünger und in Böden
(2004-11-29)Veterinary antibiotics, mainly tetracyclines and sulphonamides, are commonly used in intensive livestock production. In 1999, the use of antibiotics in the EU and Switzerland amounted to ... -
Bodenschutz in der deutschen Landwirtschaft - Stand und Verbesserungsmöglichkeiten
(2004-08-23)Soil is one of the most important agents of production for the agriculture and for the society through the supply with important food. In spite of the legal protection in Germany, soil is ... -
Stickstoff-Fixierleistung von Luzerne (Medicago sativa L.), Rotklee (Trifolium pratense L.) und Persischem Klee (Trifolium resupinatum L.) in Reinsaat und Gemenge mit Poaceen
(2003-11-10)The dry matter yield, crop residue and the total nitrogen accumulated by shoots and roots in lucerne (Medicago sativa), red clover (Trifolium pratense) and Persian clover (Trifolium resupinatum) were determined in a ...