Sökning: "fertilizer use"
Visar resultat 1 - 5 av 38 avhandlingar innehållade orden fertilizer use.
Sammanfattning : Five self-contained papers constitute this thesis. Paper 1: Does fertilizer use respond to rainfall variability? Panel data evidence from urban Ethiopia In this article, we use farmers’ actual experiences with changes in rainfall levels and their responses to these changes to assess whether patterns of fertilizer use are responsive to changes in rainfall patterns. LÄS MER
Sammanfattning : In this thesis empirical relationships and modeling tools are used to describe the relationship between human activities and meso- and large scale riverine N fluxes from land to sea. On a large scale Paper I showed that by only having knowledge about human population size and runoff one can estimate the riverine export of DIN (r2= 0.76). LÄS MER
3. European ecosystems on a changing planet : Integrating climate change and land-use intensity data
Sammanfattning : Dynamic global vegetation models are mathematical models that provide a bottom-up description of plant communities. They explicitly model physiological and population-level processes such as growth, photosynthesis, carbon allocation, regeneration and mortality. LÄS MER
Sammanfattning : This Ph.D. thesis addresses both theoretical and empirical issues pertaining to land management decisions of farm households in developing countries working under an imperfect market and institutional setting (with case studies from Ethiopia). LÄS MER
5. Effects of irrigation and fertilizer management on water and nitrogen use efficiency in maize on a semi-arid loamy sandy soil
Sammanfattning : Understanding water and nitrogen redistribution in the soil profile is important to improve water and nitrogen use efficiency for sustainable agriculture. This thesis evaluates the interactions between water and fertiliser management factors affecting water and nitrogen use efficiency, based on field experiments on a semi-arid loamy sandy soil. LÄS MER