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Aufsatz
Organic inputs and farmers' management strategies in millet fields of western Niger
(2004)
Research on soil fertility management in sub-Saharan Africa was criticized lately for largely ignoring farmers’ management strategies and the underlying principles. To fill this gap of knowledge, detailed interviews were conducted with 108 farm households about their rationale in managing the soil fertility of 307 individual fields in the agro-pastoral village territory of Chikal in western Niger. To amplify the farmers’ information on manuring and corralling practices, repeated measurements of applied amounts of ...
Aufsatz
Ensuring community and agricultural resiliency to climate change: Ceremonial practices as emic adaptive strategies
(Department of Organic Food Quality and Food Culture at the University of Kassel, Germany and Federation of German Scientists (VDW), 2016-12-23)
This paper is an analysis of emic versus etic approaches to climate change resiliency, taking as a case study the traditional ceremony performed by farmers in eastern Flores, Indonesia to rid their fields of rats. This paper begins by providing a theoretical framework discussion on the dominant etic and emic academic research on monsoons and climate change impacts on agriculture. The rat ceremony performed in villages throughout East Flores is a local custom used to rid agricultural fields of pests—often rats—that ...
Aufsatz
Nutrient cycling and field-based partial nutrient balances in two mountain oases of Oman
(2005)
Little is known about nutrient fluxes as a criterion to assess the sustainability of traditional irrigation agriculture in eastern Arabia. In this study GIS-based field research on terraced cropland and groves of date palm (Phoenix dactylifera L.) was conducted over 2 years in two mountain oases of northern Oman to determine their role as hypothesized sinks for nitrogen (N), phosphorus (P) and potassium (K). At Balad Seet 55% of the 385 fields received annual inputs of 100–500 kg N ha^-1 and 26% received 500–1400 kg ...
Aufsatz
Vegetation changes in a river oasis on the southern rim of the Taklamakan Desert in China between 1956 and 2000
(2003-11-26)
The indigenous vegetation surrounding the river oases on the southern rim of the Taklamakan Desert has drastically diminished due to overexploitation as a source of fodder, timber and fuel for the human population. The change in the spatial extent of landscape forms and vegetation types around the Qira oasis was analyzed by comparing SPOT satellite images from 1998 with aerial photographs from 1956. The analysis was supplemented by field surveys in 1999 and 2000. The study is part of a joint Chinese-European project ...
Dissertation
Szenarien zur zukünftigen Stromversorgung, kostenoptimierte Variationen zur Versorgung Europas und seiner Nachbarn mit Strom aus erneuerbaren Energien
(2006-04-11)
Sowohl die Ressourcenproblematik als auch die drohenden Ausmaße der Klimaänderung lassen einen Umstieg auf andere Energiequellen langfristig unausweichlich erscheinen und mittelfristig als dringend geboten. Unabhängig von der Frage, auf welchem Niveau sich der Energiebedarf stabilisieren lässt, bleibt dabei zu klären, welche Möglichkeiten sich aus technischer und wirtschaftlicher Sicht in Zukunft zur Deckung unseres Energiebedarfs anbieten. Eine aussichtsreiche Option besteht in der Nutzung regenerativer Energien in ...
Dissertation
Der jüdische Kaufmann, Verleger und Stadtplaner Sigmund Aschrott - eine Persönlichkeit des 19. Jahrhunderts
(2006-11-07)
Persönlichkeiten, wie sie in der Arbeit beschrieben werden, treten zu Beginn ihres biografischen Weges noch ungeprägt auf. Erst ihre Lebens- und Arbeitsverhältnisse, die Auseinandersetzung mit Menschen, öffentlichen Institutionen sowie ihr Handeln, sei es positiv oder negativ, lassen die Person zur Persönlichkeit werden. Dabei beeinflussen neben individueller Veranlagung gesellschaftliche Rahmenbedingungen diesen Bildungsprozess. Der erste Teil setzt sich mit allgemeiner Interessenwahrnehmung und deren Umsetzung als ...
Dissertation
Eduard Wechssler (1869-1949): Im Dienste der deutschen Nation
(2010-07-15)
Der Berliner Professor Eduard Wechssler ist einer der wichtigsten und Vertreter der romanistischen „Kultur- und Wesenskunde“ Frankreichs in der Zeit von 1914 bis 1933. Die vorliegende Untersuchung rekonstruiert seine Biographie und Bibliographie und stellt sie in den politischen, intellektuellengeschichtlichen, bildungspolitischen und disziplingeschichtlichen Zusammenhang der Epoche. Sie fragt außerdem nach den Vorstellungen von Frankreich, die Wechssler verbreitete, nach dem Ziel seiner Bemühungen, das „Wesen des ...
Buch
Didactics of Mathematics in Higher Education as a Scientific Discipline
(2017-03-15)
Mathematics education at the tertiary level is a practical concern in many institutions of higher education, and efforts are being made world-wide to improve its quality. A growing number of mathematicians and mathematics educators see the need for doing research and thoughtful development work in mathematics education not only at school level, but also at tertiary level. To give momentum to the establishment of a scientific community of mathematicians and mathematics educators whose concern is the theoretical ...
Aufsatz
Comparison of linear discriminant analysis, support vector machine and artificial neural network in classifying Nigerian local turkeys based on plumage colours using biometric traits
(2022-10-18)
The ability of linear discriminant analysis (LDA), support vector machine (SVM), and artificial neural network (ANN) models to differentiate biometric traits of Nigerian local turkeys was investigated in this study. The biometric traits (bodyweight, body length, breast girth, thigh length, shank length, keel length, wing length, and wingspan) in 200 (20-week-old) turkeys were measured. Seventy percent of the datasets were used to train the three models, with the remaining 30% being used to test their performance. All ...
Aufsatz
Use of corncob biochar and urea for pakchoi (Brassica rapa L.) cultivation: Short-term impact of pyrolysis temperature and fertiliser dose on plant growth and yield
(2022-10-18)
This study aimed to evaluate the effect of pyrolysis temperature of corncob biochar as a soil amendment and urea fertiliser on the growth and yield of pakchoi. Pakchoi was cultivated in pots
(13 cm height, 19 cm upper diameter, and 13.5 cm bottom diameter). Two factors including pyrolysis temperature of biochar and urea dose were combined with four levels each. Pyrolysis temperature factor consisted of B0 (no biochar), B1 (250 °C), B2 (300 °C), and B3 (350 °C). Urea dose consisted of F0 (no urea), F1 (0.6 g pot-¹), ...