Sökning: "Fertilizers"

Visar resultat 1 - 5 av 60 avhandlingar innehållade ordet Fertilizers.

  1. 1. Jordens kretslopp : lantbruket, staden och den kemiska vetenskapen 1840-1910

    Författare :Erland Mårald; Umeå universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Agricultural chemistry; experimental stations; history of science; urban - agrarian relationship; recycling; fertilizers; agro-industrial networks; environmental history;

    Sammanfattning : This study of the institutionalization and professionalization of agricultural chemistry during the second half of the nineteenth century analyses the relationship between chemical theories and social issues, ideas and experience of recycling, the development of fertilizers, and industrialization of agriculture. The study mainly takes a history of science and environmental history perspective with focus on the Swedish case. LÄS MER

  3. 2. Ecostrategies in theory and practice : Farmer's perspectives on water, nutrients and sustainability in low-resource agriculture in the dry zone of Sri Lanka

    Författare :Klas Sandell; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Attitudes towards nature; Alternative development; Carrying capacity; Development strategies; Development theory; Diffusion; Dry zone of Sri Lanka; Ecodevelopment; Ethnoperspective; Fertilizers; Green revolution; Human ecology; Human geography; Low-resource agriculture; Small-scale farming; Sustainable development; Village irrigation.; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : PROBLEMThe need for a sustainable man - nature relationship has long been a neglected aspect of development theory. The increasing awareness of this negligence has led to a search for development strategies alternative to conventional industrial growth. LÄS MER

  4. 3. Dissertatio academica de argilla ad fertilitatem contribuente, quam, suffrag. ampliss. facult. philosoph. in illustri lyceo Upsaliensi, sub præsidio [...] Johannis Gotsch. Wallerii [...] in auditorio gustaviano d. XVIII. Junii, anni MDCCLX. Horis ante meridiem solitis pro gradu publico bonorum examini modeste committit stipendiarius Regius Paulus Ol. Næsman, Jemtlandus

    Författare :Johan Gottschalk Wallerius; Paul O. Næsman; Johan Gottschalk Wallerius; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Soil amendments; Fertilizers; Gödsling; Gödselmedel; Jordförbättring;

    Sammanfattning : .... LÄS MER

  5. 4. Phosphorus recycling from wastewater to agriculture using reactive filter media

    Författare :Victor Cucarella Cabañas; Gunno Renman; Dan Berggren Kleja; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Filtra P; phosphorus; Polonite; recycling; sorption; wollastonite; Water in nature and society; Vatten i natur och samhälle;

    Sammanfattning : This thesis focused on testing the suitability of reactive filter media used for phosphorus (P) removal from wastewater as fertilizers, thus recycling P to agriculture. The work compared the P sorption capacity of several materials in order to assess their suitability as a source of P for plants. LÄS MER

  7. 5. Traditional lowland rice agriculture in Sri Lanka : Nitrogen cycling and options for biofertilizers

    Författare :Ola Palm; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : The aim of this thesis has been: to study the dynamics of soil organic-matter, with regard to nitrogen in a traditional lowland-rice agricultural system; to consider options for and nitrogen cycling of biofertilizers, especially the green-manure legume Sesbania sesban; to discuss fertilizer sources and management constraints as parts of a sustainable agricultural development; and to discnss the methodological problems of controlled experiments vs. investigations in farmer's fields. LÄS MER