No description available.

Thesis (M. Sc.)--University of Hong Kong, 1994.

Thesis (MSD(Social Work and Criminology))-University of Pretoria, 2007. / Includes bibliographical references.

Thesis (Ph. D.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains viii, 152 p. : ill. (some col.), map. Includes abstract. Includes bibliographical references (p. 140-147).

No description available.

Thesis (M.P.A.)--University of Hong Kong, 1995. / Includes bibliographical references (leaves 135-141).

Thesis (M.P.A.)--University of Hong Kong, 1995. / Includes bibliographical references (leaves 135-141). Also available in print.

This thesis studies the Riam Kanan Catchment (RKC), located in Indonesia, in order to: evaluate the effect of land use on runoff, erosion and soil properties; examine rainfall-runoff-erosion relationships under different land use types; evaluate the suitability of runoff and soil erosion models; develop an understanding of the interaction between physical, demographic, socio-economic and political aspects in relation to soil erosion; evaluate population pressure and its impacts; develop a suitable methodology for identifying potential erosion hazard areas; and develop suitable soil conservation strategies. Rainfall pattern and water level fluctuation; changes in runoff, erosion and soil properties under different land use types; relationships between soil properties as well as between rainfall and runoff-erosion; population pressure; and potential hazard areas were all analysed. Selected runoff and erosion models were evaluated for their suitability, and soil conservation strategies were developed, considering physical, demographic, socio-economic and political aspects. Results show that changes in inflow patterns are most likely due to changes in volumes of surface and subsurface runoff values; erosion in RKC is occurring at various levels depending on the land use types; there is a relationship between rainfall-runoff and erosion parameters; population pressure is above the critical limit and can be reduced by various methods; and RKC has a moderate to high erosion hazard. The soil conservation strategies outlined in this study appear promising. / Doctor of Philosophy (PhD)

Indigenous African shifting cultivation production systems, that were developed over many generations and took into account production potential as well as the constraints imposed by natural resources, are no longer practicable for Nigerian smallholder farmers. These systems relied on long fallow for fertility restoration after a period of cropping. Overpopulation has resulted in lower per capita land availability, necessitating a shift to sedentary cultivation systems. In such systems, fallow is short term (months) compared to shifting systems, where it lasted several years. This shift has resulted in overexploitation of land resources and despite intensification of agricultural production methods, non-sustainable demand on the natural resource base has increased and crop and animal production has declined. This study examined the performance of five maize-based cropping systems consisting of cereal-legume, cereal-cereal and cereal bare fallow rotations, to identify systems that have potential for increased agricultural production in the subhumid and mid-altitude zones of Nigeria. The study was conducted at Richmond, near Sydney, in NSW, Australia from 2000 to 2003. The trial investigated the effects of the combined use of legumes and N fertilizer in CSs to maintain or improve soil fertility, maize crop and maize storage silage production and yield and quality of all crop residues. This study showed that inclusion of a legume in the rotation is an important production and income generating strategy. Owing to their potential for increased maize productivity, to build up N-rich systems and to improve small holder levels of farm income, cropping systems with legumes should therefore be given more research attention in Nigeria / Doctor of Philosophy (PhD)

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