Search
Now showing items 201-210 of 255
Dissertation
Effects of Organic and Inorganic Fertilizers on Growth and Yield of Banana (Musa AAA cv. Malindi) in Oman
(2012-12-06)
The Sultanate of Oman is located on the south-eastern coast of the Arabian Peninsula, which lies on the south-western tip of the Asian continent. The strategic geographical locations of the Sultanate with its many maritime ports distributed on the Indian Ocean have historically made it one of the Arabian Peninsula leaders in the international maritime trade sector. Intensive trading relationships over long time periods have contributed to the high plant diversity seen in Oman where agricultural production depends ...
Dissertation
Matter fluxes in mountain oases of Al Jabal Al Akhdar, Oman
(2012-04-05)
Since 1970 when Sultan Qaboos bin Said Al Said took over power from this father, agriculture in Oman has undergone major transformations as a consequence of rapid population and economic growth. In this process groundwater extraction has dramatically increased to meet domestic and agricultural needs. Recently, the agro-ecosystem of ancient mountain oases of Oman have received greater attention as interest has grown to understand the causes of their often millennia old sustainable productivity.
Particularly little ...
Dissertation
Nutrient cycling and nutrient use efficiency in urban and peri-urban agriculture of Kabul, Afghanistan
(2011-05-31)
Like elsewhere also in Kabul, Afghanistan urban and peri-urban agriculture (UPA) has often been accused of being resource inefficient and unsustainable causing negatives externalities to community health and to the surroundings. These arise from the inappropriate management and use of agricultural inputs, including often pesticides and inter-city wastes containing heavy metal residues and pathogens. To address these concerns, parallel studies with the aims of quantification of carbon (C), nitrogen (N), phosphorus (P) ...
Dissertation
Nutrient and virtual water fluxes of vegetable production and food distribution in two West African cities
(2017-10-04)
Water and food security will be challenged by uncertainties related to changing climatic and socio-economic conditions triggered by urbanization. The present studies aimed at (a) investigating the effects of mineral fertilization and biochar amendment at two water quality and quantity levels on biomass production, plant nutrition, and soil moisture in vegetables with a focus on Tamale, (b) assessing nutrient losses via leaching and gaseous emissions and calculated nutrient balance and use efficiencies in Tamale and ...
Dissertation
Gaseous and leaching losses of carbon and nitrogen in irrigated organic farming of a coastal oasis in Oman
(2011-03-14)
In der Dissertation wurden die Effekte verschiedener C/N-Verhältnisse und verschiedener Verhältnisse von strukturellen zu löslichen Kohlenhydraten (NDF/SC) von Dung, der in bewässerten Gemüsekulturen im Norden Omans appliziert wurde, untersucht. Im auf sandigen Böden durchgeführten Experiment wurden zwei Büffeldungvarianten zum einen mit einem C/N-Verhältnis von 19 und einem NDF/SC-Verhältnis von 17 (ORG1) und zum anderen mit einem C/N-Verhältnis von 25 und einem NDF/SC-Verhältnis von 108 (ORG2) verwendet. Das relevante ...
Dissertation
Effects of tillage intensity on soil C, N, and P pools with different stability
(2013-11-29)
Es ist bekannt, dass die Umsatzdynamik der organischen Substanz von der Bodenbearbeitungsintensität abhängt. Bis jetzt sind nur wenige Daten zum Einfluss der Bearbeitungsintensität und des Zwischenfruchtanbaus auf C-, N-, und P-Dynamik im Ober- (0-5 cm Tiefe) und Unterboden (5-25 cm Tiefe) von Lössböden verfügbar. Hauptziele dieser Arbeit waren die (i) Quantifizierung des Einflusses von verschiedenen langzeitig durchgeführten Bearbeitungssystemen auf labile, intermediäre, und passive C- und N-Pools; (ii) Quantifizierung ...