Search
Now showing items 21-30 of 138
Aufsatz
High-Quality Solid Fuel Production from Leaf Litter of Urban Street Trees
(2016-11-30)
Leaf litter is a growing concern for cities. Due to adherent dirt such biomass is rarely utilized nowadays but may constitute a renewable energy source for communities or private households. Leaf litter from main roads, residential areas and city centres collected by the vacuum technique or the sweeper technique was sampled and analysed for ash content and chemical composition. Ash content of leaf litter collected by the sweeping technique was higher (21.6%–40.1% dry matter, DM) than in material collected by the ...
Aufsatz
Fusion of Ultrasonic and Spectral Sensor Data for Improving the Estimation of Biomass in Grasslands with Heterogeneous Sward Structure
(2017-01-21)
An accurate estimation of biomass is needed to understand the spatio-temporal changes of forage resources in pasture ecosystems and to support grazing management decisions. A timely evaluation of biomass is challenging, as it requires efficient means such as technical sensing methods to assess numerous data and create continuous maps. In order to calibrate ultrasonic and spectral sensors, a field experiment with heterogeneous pastures continuously stocked by cows at three grazing intensities was conducted. Sensor ...
Dissertation
The potential of UAV-based remote sensing for the prediction of aboveground biomass and N fixation in legume-grass mixtures
(2020-07)
The world population is growing steadily and with it the demand for meat and animal protein. A major source of feed for livestock is grassland, which serves as high quality and protein rich forage. In addition to permanent grassland, temporary grassland is a valuable crop rotation element, especially in organic farming, since legumes in legume-grass mixtures can fix atmospheric nitrogen (NFix). To further increase the intensification in agriculture, reliable non-destructive measurement techniques are needed as an ...
Dissertation
Technical and Environmental Assessment of Energy and Material Production from Rural and Urban Residual Biomass
(2020-04)
Die vorliegende Arbeit umfasst Studien zur Untersuchung technischer und ökologischer Aspekte bei der Nutzung von Restbiomassen in den Nutzungspfaden Energieerzeugung und Aktivkohleproduktion. Im Mittelpunkt der jeweiligen Untersuchung stand das Verfahren zur integrierten Erzeugung von Festbrennstoff und Biogas aus Biomasse (IFBB) und dessen Einfluss auf technische und ökologische Aspekte bei der Verwertung von Restbiomassen. Im Zuge von Naturschutz- und Landschaftspflegemaßnahmen auf extensiv bewirtschafteten ...
Dissertation
Effect of different types of soil conditioners (plant-derived composts and animal manure) and application methods on quantitative and qualitative characteristics of tomatoes and selected soil parameters
(2018)
World population prospect has increased the need for food production, therefore ensuring the sustainable production of food has been of interest to researchers of agricultural sciences, as well as politicians, due to high demands by consumers in various countries in the world.
In this dissertation, we have investigated the effect of different types of composts, from residual biomass (household compost (HC), Spent mushroom compost (SMC) and Vermicompost (VC)), on different characteristics of plant and soil in organic ...
Dissertation
Assessment and use of sea buckthorn and apple diversity in northern Pakistan
(2020-12-03)
Many local perennial plant genetic resources (P/PGR) are under threat due to over-exploitation, depletion, degradation, farmers’ favoring few cash crops, poor marketing conditions leading to low product prices along with the lack of knowledge about alternative uses and management strategies. Such processes often cause the underutilization and replacement of local P/PGR causing them to become neglected and underutilized species (NUS). The decline of species abundance may cause genetic erosion of these NUS crops and ...
Dissertation
Development of Maize Post-harvest Loss Reduction Mechanism Owing to Mycotoxin-producing Fungi Contamination Along Agro-ecology and Supply Chain in Southwestern Ethiopia
(2018)
Kurzfassung In vielen ländlichen Gebieten Äthiopiens ist Mais mit seinem hohen Kalorienwert das vorherrschende Grundnahrungsmittel und zudem für die Landwirte eine wichtige Einkommensquelle. Hohe Nachernteverluste sind jedoch ein landesweites Problem, allerdings gibt es hierzu kaum belastbare Daten, die die Ausarbeitung einer Reduzierungsstrategie erlauben würden. Insbesondere gilt das für die Verluste durch Pilzbefall und die daraus folgende Mykotoxinbelastung, wie dies häufig in den heißen und feuchten Klimabereichen ...
Aufsatz
The ‘forma specialis’ issue in Fusarium: A case study in Fusarium solani f. sp. pisi
(2018-01-19)
The Fusarium solani species complex (FSSC) has been studied intensively but its association with legumes, particularly under European agro-climatic conditions, is still poorly understood. In the present study, we investigated phylogenetic relationships and aggressiveness of 79 isolates of the FSSC collected from pea, subterranean clover, white clover and winter vetch grown under diverse agro-climatic and soil conditions within Temperate and Mediterranean Europe. The isolates were characterized by sequencing tef1 and ...
Dissertation
Untersuchung und Darstellung der Qualitätsveränderung von Agrarprodukten während der Trocknung
(2018)
Das Ziel der Arbeit war es optimale Trocknungsprozesse für verschiedene Agrarprodukte zu finden. Dazu wurden die Qualitätskriterien frischer und getrockneter Agrarprodukte analysiert und die Veränderungen durch die unterschiedlichen Trocknungsparameter, wie Luftgeschwindigkeit, Taupunkttemperatur, Trocknungstemperatur und –zeit dargestellt. In einer Literaturrecherche wurden sowohl die Faktoren für die Nachernteverluste und deren Höhe in Industrie- sowie Schwellen- und Entwicklungsländer untersucht. Zudem sind die ...