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Now showing items 11-20 of 23
Aufsatz
Pharmaceutical consumption and residuals potentially relevant to nutrient cycling in Greater Accra, Ghana
(Kassel University Press, 2010)
Recycling nutrients form sanitary wastes back into agricultural ecosystems offers an option to alleviate soil depletion in regions where the use of mineral fertiliser is limited. Exemplary nutrient and water cycling approaches, including collection, treatment and use of human urine, are established at Valley View University (VVU) in Greater Accra, Ghana.
Concerns have been recently raised in regard to fate and impact of pharmaceutical residues in soils and interlinked environment. To evaluate in how far emerging ...
Aufsatz
Learning achievements of farmers during the transition to market-oriented organic agriculture in rural Uganda
(Kassel University Press, 2010)
Organic agriculture requires farmers with the ability to develop profitable agro-enterprises on their own. By drawing on four years of experiences with the Enabling Rural Innovation approach in Uganda, we outline how smallholder farmers transition to organic agriculture and, at the same time, increase their entrepreneurial skills and competences through learning. In order to document this learning we operationalised the Kirkpatrick learning evaluation model, which subsequently informed the collection of qualitative ...
Aufsatz
Smallholder group certification in Uganda - Analysis of internal control systems in two organic export companies
(Kassel University Press, 2010)
The organic agricultural sector of Uganda is among the most developed in Africa in terms of its professional institutional network and high growth rates of number of certified farmers and land area. Smallholder farmers are certified organic through contract production for export companies using a group certification scheme (internal control system - ICS). The ICS is a viable and well-accepted tool to certify small-scale producers in developing countries all over the world. Difficulties in certification are still ...
Aufsatz
Assessment of the strategies of organic fruit production and fruit drying in Uganda
(Kassel University Press, 2010)
Organic agriculture in Uganda is developing at a fast pace and despite this trend Uganda is still unable to produce enough fresh and dry organic fruits mainly pineapple to meet the exporters demand. This current research investigated the strategies of farmers at production level by assessing the pros and cons of fruit growing, organic agriculture and fruit drying in order to understand the underlying causal factor for the low production of organic dry fruits in a major fruit producing district of Uganda.
The study ...
Aufsatz
Carbon and nitrogen emissions from stored manure and cropped fields in irrigated mountain oases of Oman
(Kassel University Press, 2010)
Little is known about gaseous carbon (C) and nitrogen (N) emissions from traditional terrace agriculture in irrigated high mountain agroecosystems of the subtropics. In an effort towards filling this knowledge gap measurements of carbon dioxide (CO_2), methane (CH_4), ammonia (NH_3) and dinitrous oxide (N_2O) were taken with a mobile photoacoustic infrared multi-gas monitor on manure-filled PE-fibre storage bags and on flood-irrigated untilled and tilled fields in three mountain oases of the northen Omani Al Jabal ...
Aufsatz
Growth and yield of groundnut, sesame and roselle in an Acacia senegal agroforestry system in North Kordofan, Sudan
(Kassel University Press, 2010)
A field experiment was conducted under rainfed conditions in western Sudan at El-Obeid Research Farm and Eldemokeya Forest Reserve, North Kordofan State, during the growing seasons 2004/05 and 2005/06. The main objective was to investigate the soil physical and chemical properties and yield of groundnut (Arachis hypogea), sesame (Sesamum indicum) and roselle (Hibiscus sabdariffa) of an Acacia senegal agroforestry system in comparison with the sole cropping system. Data were recorded for soil physical and chemical ...
Dissertation
Effects of Different Feeding Regimes on the Digestibility and Faecal Excretion of Nitrogen, Soluble Carbohydrates and Fibre Fractions in Water Buffaloes kept under Subtropical Conditions
(2010-11-12)
In the course of the ‘Livestock Revolution’, extension and intensification of, among others, ruminant livestock production systems are current phenomena, with all their positive and negative side effects. Manure, one of the inevitable secondary products of livestock rearing, is a valuable source of plant nutrients and its skillful recycling to the soil-plant interface is essential for soil fertility, nutrient - and especially phosphorus - uses efficiency and the preservation or re-establishment of environmentally ...
Dissertation
Konservierende Bodenbearbeitung im Ökolandbau - Analyse einer Verfahrenstechnik im Kontext der Bodenfruchtbarkeit
(2010-09-29)
Seit der Gründung der Ökologischen Landbaubewegung wird über eine angepasste Bodenbearbeitung diskutiert. Konservierende Bodenbearbeitungssysteme scheinen zwar dem Prinzip des Erhalts und der Förderung der Bodenfruchtbarkeit am ehesten gerecht zu werden, wurden bislang vor allem auf Grund der Unkrautregulierung im Ökolandbau abgelehnt. Anhand von vier Methoden (Literaturrecherche, Feldversuch, Umfrage und Experteninterviews) werden die unterschiedlichen Aspekte der konservierenden Bodenbearbeitung in der Praxis des ...
Dissertation
Entwicklung eines Online-Messverfahrens zur Bestimmung des Bodenbedeckungsgrades bei der Stoppelbearbeitung zu Mulchsaatverfahren
(2010-08-13)
Die vorliegende Arbeit ist Teil eines Verbund-Forschungsprojektes mit dem Ziel, eine Präzisions-Bodenbearbeitung in Abhängigkeit von verschiedenen Bodenparametern sowie dem Bodenbedeckungsgrad zu realisieren. Ziel dieses Teilprojektes war die Bereitstellung einer Online-Messung des Bedeckungsgrades, um die Bearbeitungsintensität während der Feldüberfahrt regeln zu können: Ein Kamerasensor vorne am Schlepper ermittelt die Bodenbedeckung und ein Tiefen-Sollwert wird an das Regelsystem eines Gerätes zur teilfächenspezifischen ...
Dissertation
Genetic variation of and environmental effects on inducibility of resistance in tomatoes (Solanum lycopersicum L.) to Phytophthora infestans (Mont) de Bary
(2010-12-02)
Many plant strengtheners are promoted for their supposed effects on nutrient uptake and/or resistance induction (IR). In addition, many organic fertilizers are supposed to enhance plant health and several studies have shown that tomatoes grown organically are more resistant to late blight, caused by Phytophthora infestans to tomatoes grown conventionally. Much is known about the mechanisms underlying IR. In contrast, there is no systematic knowledge about genetic variation for IR. Therefore, the following questions ...