Browsing Fakultät für Agrarwissenschaften (GFA) by Title
Now showing items 661-680 of 949
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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 ... -
Plant communities in organic and conventional agriculture - comparing local, landscape and regional effects
(2006-02-13)During the last decades increasing agricultural intensification in Europe has led to a decrease in species richness and a change in species composition of arable weeds. The drivers of these diversity losses operate at ... -
Plant Root Exudates
(2017-02-09)Root exudates represent complex mixtures of low-molecular-weight and high-molecular-weight compounds. The former comprise predominantly primary and secondary plant metabolites, the latter mucilage precursors and some ... -
Plant Secondary Metabolites Allelopathic Functions and Biomedical Potential
(2021-07-07)Secondary metabolites can contribute to the plant’s survival in the ecosystem in various ways. They include allelochemicals involved in interactions with microorganisms, herbivores, and other plants sharing the same ... -
Plant virus identification and virus-vector-host interactions
(2019-12-03)The overall aim of this dissertation was the implementation of high-throughput sequencing (HTS) technologies for plant viruses’ identification and characterisation. Different viral enrichment approaches were tested to ... -
Plant-herbivore-predator communities and grassland management intensity - Implications for biodiversity conservation practices on local and landscape scales
(2013-01-23)The rapid growth of the human population and the concomitant demands for fuel, food and agricultural products put increasing pressures on ecosystems around the world. This has become a major driver of global environmental ... -
Plant-insect interactions in changing environments
(2010-08-18)Plant-insect interactions are essential to structure and functioning of terrestrial ecosystems. Shifts within interactions, or their removal from ecosystems due to human caused environmental ... -
Plant-pollinator networks in fragmented calcareous grasslands
(2021-04-23)Understanding the dynamics of species interactions under the threats of habitat loss and fragmentation can be key to develop measures preventing further degradation of natural and agricultural systems. Agroecological ... -
Policies and Management Practices for Sustainable Oil Palm - Evidence from Indonesia
(2020-07-17)Changing consumption patterns and a growing world population have resulted in an increased demand for vegetable oil. Due to its price advantages and suitable chemical properties, in particular the demand for palm oil has ... -
Policy Interventions and Smallholder Market Linkage: Case Study from Nicaragua
(2015-08-18)Smallholder market participation has been discussed as a catalyst against poverty. This dissertation addresses policy tools to enable market linkage of small farmers in rural areas. It looks at road infrastructure improvement ... -
Policy interventions, perceptions, and pro-environmental behavior for sustainable oil palm cultivation in Indonesia
(2021-12-01)In the last decades, oil palm cultivation has increased rapidly to meet the rising demands for vegetable oils worldwide. While in the 1970s, two million tons of palm oil on 3.3 million hectares of land were produced ... -
Pollen Genotype Effects on Seed Quality and Selection of Single Seeds by Near-Infrared Reflectance Spectroscopy (NIRS) in Winter Oilseed Rape
(2004-09-08)Oilseed rape is one of the most important oilseed crops of the world. Because of the success in quality breeding, the growing area of oilseed rape is gradually increasing. Although the seed ... -
Pollinator communities and plant-pollinator interactions in fragmented calcareous grasslands
(2007-08-01)Agricultural intensification has caused a substantial decline of once common semi-natural habitats in the agricultural landscape. Many calcareous grasslands, one of the most species-rich ... -
Pollinators and Ecosystem Services in an Oil Palm Transformation Landscape
(2022-09-27)Insect pollination is an economically important ecosystem service that depends heavily on wild pollinators. Landscape transformation caused by conversion to agriculture threatens habitats of wild pollinators, reducing their ... -
Population structure of Magnaporthe oryzae from different geographic regions and interaction transcriptomes with rice genotypes at high temperature
(2016-09-16)It is currently hypothesized that climate change may lead to global warming, and temperatures might increase by 2-5°C at the end of the twenty-first century. However, the consequences of the expected temperature elevation ... -
Potassium nutrition on tomato (Solanum lycopersicon L.) has an impact on production, postharvest behavior, and fruit sensory profile
(2021-02-04)Tomato (Solanum lycopersicon L.) is the most important vegetable in the world consumption and production. The fruits significantly contribute to human health, as they are rich in vitamins, minerals, sugars and antioxidants. ... -
Potassium uptake efficiency mechanisms and root exudates of different crop species
(2007-05-03)Potassium uptake efficiency is the ability of plants to take up sufficient K under low soil K availability. Plant species differ in their K uptake efficiency. This study was done with the ... -
Potential for Sustainable Poultry Production Based on Local Chicken Breeds and Regional Protein Plants
(2022-03-22)During the 20th century, poultry production evolved to a highly specific sector with special chicken lines for egg production on the one hand and meat production on the other. While of broilers both sexes can be used for ... -
Potential Impact of Increasing Ammonia Concentrations upon Microbial Population Dynamics in Anaerobic Meso- and Thermophilic driven Fermenters
(2020-02-06)Anaerobic digestion is the process of decomposition of organic matter by a microbial consortium in an oxygen-free environment. The produced biogas from this process is composed of methane, carbon dioxide, nitrogen, oxygen, ...