Search for dissertations about: "soil fertility"

Showing result 16 - 20 of 45 swedish dissertations containing the words soil fertility.

  2. 16. On-farm agrohydrological analysis of the Sahelian yield crisis : rainfall partitioning, soil nutrients and water use efficiency of pearl millet

    Author : Johan Rockström; Jim Wallace; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Natural Resources Management; naturresurshushållning;

    Abstract : Sub-Saharan Africa is presently experiencing a steadily aggravated food security crisis. This crisis is a result of a rapidly growing population combined with insignificant yield increases of the major cereal crops maize, millet and sorghum, during the last decades. READ MORE

  4. 17. Dry spell mitigation to upgrade semi-arid rainfed agriculture : Water harvesting and soil nutrient management for smallholder maize cultivation in Machakos, Kenya

    Author : Jennie Barron; Carl Folke; Theib Oweis; Stockholms universitet; []
    Keywords : ;

    Abstract : Improvements in on-farm water and soil fertility management through water harvesting may prove key to up-grade smallholder farming systems in dry sub-humid and semi-arid sub-Sahara Africa (SSA). The currently experienced yield levels are usually less than 1 t ha-1, i.e. READ MORE

  5. 18. Essays on Natural Resource Economics

    Author : Godwin Kofi Vondolia; Göteborgs universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; natural resource management; bribery; social exclusion; spatial fishery management; exclusive economic zone; contingent valuation; payment vehicles; soil and water conservation; fertilizer subsidy;

    Abstract : Paper 1: Enforcement of exogenous environmental regulation, social disapproval and bribery Many resource users are not directly involved in the formulation and enforcement of resource management rules and regulations in developing countries. As a result, resource users do not generally accept such rules. READ MORE

  6. 19. Nitrogen and phosphorus dynamics across an elevational gradient in a Swedish subarctic tundra

    Author : Maja Sundqvist; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Rising temperatures associated with global climate change are likely to drive major shifts in plant and soil properties as well as plant-soil linkages that govern key ecosystem processes in subarctic tundra. However, the tundra landscape is not homogenous, but instead consists of a mosaic of vegetation types which differ greatly in vegetation characteristics and soil fertility. READ MORE

  7. 20. Modelling site-dependent environmental impacts of nitrogen fertiliser use in life cycle assessments of crop cultivation

    Author : Kajsa Henryson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Use of mineral nitrogen fertilisers in crop cultivation has enabled substantial yield increases, strengthening global food security. High yields also allow better resource efficiency and result in higher organic matter inputs to soil, increasing the potential for soil carbon sequestration. READ MORE