Sökning: "herbicide"

Visar resultat 11 - 15 av 20 avhandlingar innehållade ordet herbicide.

  1. 11. Fruit tree-based agroforestry on sloping uplands in northwest Vietnam: Effects on soil conservation, tree-crop performance and weed management

    Författare :Hung Do Van; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : On sloping land, agroforestry can be a more sustainable way to produce food andother products and services than sole-crop cultivation of crops. This thesis examinedwhether fruit tree-based agroforestry on smallholder farms on sloping uplands canhave a positive impact on sustainability. LÄS MER

  3. 12. Hierarchical responses to organic contaminants in aquatic ecotoxicological bioassays: from microcystins to biodegradation

    Författare :Katia Montenegro; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; grazing efficiency; potential trade-off; glyphosate mineralization; DDE; potential denitrification; microcystin production; potential nitrification; DDE biodegradation; water stable isotopes; groundwater apparent age; fenthion; Chlorophyta; Daphnia pulex; diversity productivity relationship; glyphosate;

    Sammanfattning : In this thesis I explore the ecotoxicological responses of aquatic organisms at different hierarchical levels to organic contaminants by means of bioassays. The bioassays use novel endpoints or approaches to elucidate the effects of exposure to contaminants and attempt to give mechanistic explanations that could be used to interpret effects at higher hierarchical scales. LÄS MER

  4. 13. Dormancy in reproductive vegetative buds in creeping perennials dominating the agricultural weed flora in Scandinavia

    Författare :Josefine Liew; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Dormancy, which is the inability to initiate normal growth under otherwise favourable conditions, is an adaptation to escape sprouting prior to seasonal cold temperatures and/or drought in areas where winters are harsh or summers dry. Dormancy in woody perennials of northern temperate areas is, in general, induced by photoperiodic and/or temperature changes, and released after prolonged exposure to chilling. LÄS MER

  5. 14. Impact and control of weeds in biomass willow clones

    Författare :Johannes Albertsson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Willow (Salix spp.) grown on arable land as short-rotation coppice (SRC) produces renewable energy in the form of woody biomass. This perennial crop has a high ratio of energy output to input and a good environmental profile. However, weed control is mostly dependent on herbicide use. LÄS MER

  7. 15. Modelling climate change impacts on pesticide leaching : uncertainty and scenario analysis at field and regional scales

    Författare :Karin Anna Steffens; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Climate change projections for Sweden indicate increases in both temperature and precipitation. In a warmer and wetter climate, weed and pest pressures are likely to increase, which might in turn trigger an increased use of pesticides. LÄS MER