Search for dissertations about: "cropping"

Showing result 16 - 20 of 48 swedish dissertations containing the word cropping.

  2. 16. Becoming Biofuels. The messy assembling of resources, sustainability, poverty, land use, and nation-states

    Author : Marie Widengård; Göteborgs universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; biofuels; jatropha; assemblages; governmentality; political ecology; political economy; ethnography; governance; materiality; authority; territory; sovereignty; resources; poverty; sustainability; land use change; states; standards; certification; Africa; Zambia; Mozambique; Tanzania; Kenya; Brazil; EU;

    Abstract : Biofuels have come to represent the will to mitigate climate change by replacing fossil fuels with so-called climate-friendly and renewable plant sources, and to improve rural and poor conditions in the South through biofuel crop production, farm job creation, and smallholder cash cropping. The expansion of biofuels in countries in the South largely pivoted upon ‘the will to develop’, specifically through the oil shrub Jatropha curcas L. READ MORE

  4. 17. Insect-plant interactions within cultivar mixtures : volatile plant communication as an underlying mechanism

    Author : Sokha Kheam; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Promoting genotypic diversity of crops via cultivar mixtures presents a promising strategy to sustainably control insect pests and diseases, and thereby enhance yield. However, the underlying mechanisms responsible for reduced pest performance in cultivar mixtures remain unexplored. READ MORE

  5. 18. Associations among early-season root and shoot traits, nutrient use efficiency and grain yield of spring wheat

    Author : Hui Liu; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Nutrient-efficient and high-yielding spring wheat is needed in high-latitude regions. The aims of this thesis were: (1) to evaluate the effects of soil compaction and differential weather conditions on plant growth and grain yield, (2) to identify critical nutrient elements limiting plant growth and grain yield, and (3) to identify root and shoot traits at an early growth stage (early vigor) influencing nutrient use efficiency and grain yield of spring wheat. READ MORE

  6. 19. Soil Degradation of Raised-beds on Orchards in the Mekong Delta Field and Laboratory Methods

    Author : Quang Pham Van; Per-Erik Jansson; Khoa Le Van; Ingmar Messing; KTH; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; citrus orchards; nutrient; soil fertility; soil strength; soil degradation; alluvial soil; Mekong delta;

    Abstract : Soil degradation is a complex process which may occur anywhere and at any time. It directly affects the physical, chemical and biological processes within the soil profile. Soil degradation can either be as a result of natural hazards or due to manmade actions, such as mismanagement on cropping patterns, soil preparation and cultivation practices. READ MORE

  7. 20. Drainage intensity in paddy rice fields : nitrogen flows, salinity, rice yield and greenhouse gas emissions

    Author : Olive Tuyishime; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Managing drainage intensity is important in controlling soil moisture and nutrient losses and improving crop yields. This thesis evaluated the effects of drainage intensity on nitrogen losses, salinity and rice grain yield in three cropping seasons, and on gaseous emissions of methane (CH4) and nitrous oxide (N2O) from rice flowering to ripening in one season, on a marshland in semiarid region of Rwanda. READ MORE