Search for dissertations about: "Weeds"

Showing result 1 - 5 of 20 swedish dissertations containing the word Weeds.

  2. 1. Seed dormancy and germination in an ecological context : comparative studies of annual weeds

    Author : Laila Karlsson; Per Milberg; Ken Thompson; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Asteraceae; Bidens; Compositae; deadnettle; Galinsoga; germination timing; Guizotia; evolution; Labiatae; Lamiaceae; Lamium; morphophysiological dormancy; Papaveraceae; Papaver; Parthenium; physiological dormancy; poppy; summer annual; Tagetes; Verbesina; winter annual; Biology; Biologi;

    Abstract : Germination ecology studies, i.e. studies of interactions between characteristics of the seeds and environmental circumstances, provide understanding of spatial and temporal patterns of emergence of wild species, as weeds in the field. A large number of species have seed dormancy, i. READ MORE

  4. 2. Crop and weed discrimination using computer vision

    Author : Maria Persson; Chalmers University of Technology; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Image analysis; Crops; Weeds; Other information technology; Övrig informationsteknik;

    Abstract : The thesis is concerned with computer vision in ecological and precision agriculture aiming to identify crops and weeds in images of crop rows. The identification of plants can be done by extracting the plants in the image and classifying them as a crop or weed depending on the shape and color. READ MORE

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

    Author : Johannes Albertsson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : 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. READ MORE

  6. 4. Cereals, weeds and crop processing in iron age Sweden. : Methodological and interpretive aspects of archaeobotanical evidence

    Author : Karin Viklund; Umeå universitet; []
    Keywords : ;

    Abstract : .... READ MORE

  7. 5. Within-species variation in grass weeds in Sweden : dormancy, herbicide response, genetic relationships

    Author : Liv Åkerblom Espeby; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Variation within a weed species enables it to persist through varying conditions and is thus an important component of weediness. In this thesis, intra-specific variation in two agronomically important attributes - herbicide susceptibility and seed dormancy - are studied in Swedish Apera spica-venti (L.) Beauv. and Alopecurus myosuroides Huds. READ MORE