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Now showing items 281-290 of 341
Aufsatz
Die Wahrnehmung Jerusalems auf mittelalterlichen Weltkarten (Textversion)
(Bauer, Dieter (u.a.) (Hrsg.), 2001)
Aufsatz
Städtischer Raum und kommunale Bauplanung im Rom des 12. bis 14. Jahrhunderts
(Associazione Geografi Italiani, 2005)
Aufsatz
Conti, Niccolò dei (c. 1395-1469)
(Speake, Jennifer (Hrsg.), 2003)
Aufsatz
Germanische Eliten in den antiken Schriftquellen
(Varusschlacht im Osnabrücker Land GmbH - Museum und Park Kalkriese, 2009)
Aufsatz
Drainage, salt leaching and physico-chemical properties of irrigated man-made terrace soils in a mountain oasis of northern Oman
(2005)
Little is known about the sustainability of irrigated oasis agriculture in northern Oman. The objective of this study therefore was to examine which factors allowed agricultural productivity to be apparently maintained during the two millenia of a mountain oasis’ existence. Soil moisture and physico-chemical properties were measured in a typical flood-irrigated field sown to alfalfa (Medicago sativa L.). Particle size, organic (C_org) and inorganic carbon content, pH and electrical conductivity (EC)of the soil profile ...
Aufsatz
Precision mapping
(2000)
The nondestructive determination of plant total dry matter (TDM) in the field is greatly preferable to the harvest of entire plots in areas such as the Sahel where small differences in soil properties may cause large differences in crop growth within short distances. Existing equipment to nondestructively determine TDM is either expensive or unreliable. Therefore, two radiometers for measuring reflected red and near-infrared light were designed, mounted on a single wheeled hand cart and attached to a differential ...
Aufsatz
Legume rotation effects on early growth and rhizosphere microbiology of sorghum in West African soils
(2004)
Cereal yield increases in legume rotations on west African soils were the subject of much recent research aiming at the development of more productive cropping systems for the mainly subsistence-oriented agriculture in this region. However, little has been done to elucidate the possible contribution of soil microbiological factors to these rotation effects. Therefore a pot trial was conducted using legume rotation and continuous cereal soils each from one site in Burkina Faso and two sites in Togo where cropping ...
Aufsatz
Field measurements of the CO2 evolution rate under different crops during an irrigation cycle in a mountain oasis of Oman
(2004)
For millennia oasis agriculture has been the backbone of rural livelihood in the desertic Sultanate of Oman. However, little is known about the functioning of these oasis systems, in particular with respect to the C turnover. The objective was to determine the effects of crop, i.e. alfalfa, wheat and bare fallow on the CO2 evolution rate during an irrigation cycle in relation to changes in soil water content and soil temperature. The gravimetric soil water content decreased from initially 24% to approximately 16% ...