Essays about: "nitrogen surplus"

Showing result 1 - 5 of 12 essays containing the words nitrogen surplus.

  1. 1. Nutrient flow on agroforestry farms in the province of Son La in northwest Vietnam

    University essay from Uppsala universitet/Vindenergi

    Author : Tula Strotz; [2023]
    Keywords : Agroforestry; contouring grass rows; Guinea grass; nutrient losses; Vietnam; Gräsbarriärer; Höglandsodling; näringsförlust; Träjordbruk; Vietnam;

    Abstract : The population in the high mountains of the northwest provinces of Vietnam belongs to the poorest population in the country. Among the reasons behind this are the high frequency of minority groups in the region and the infertile soils of the steep slopes. READ MORE

  3. 2. Nitrogen legacies in agricultural catchments : an analysis of 170 years of nitrogen legacies data in four Swedish agricultural catchments

    University essay from SLU/Dept. of Soil and Environment

    Author : Laura-Ainhoa Prischl; [2023]
    Keywords : nitrogen mass balance; nitrogen surplus; land use trajectories; hysteresis effect; water quality; agriculture; nitrogen surplus; land use trajectories; hysteresis effect; water quality; agriculture;

    Abstract : Despite the enforcement of legislation and application of measures, nitrogen (N) levels continue to be high in streams. One of the reasons for the low N reduction, is the legacy accumulation of N. READ MORE

  4. 3. Separation and acidification of digested animal manure : properties of the future organic fertilizers

    University essay from SLU/Dept. of Soil and Environment

    Author : Marie Björs; [2023]
    Keywords : Digestate; Eutrophication; Farmers’ survey; Plasma activation; Screw press;

    Abstract : Agricultural areas with a high animal density contribute to eutrophication in waterbodies and seas worldwide due to accumulation of nutrients around animal farms. Animal manure is heavy and bulky, thus unpractical to transport long distances and new techniques have been developed to refine animal manure and make it easier to transport. READ MORE

  5. 4. Nutrient Retention in Constructed Wetlands

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Johanna Kero; [2022]
    Keywords : Constructed wetlands; nutrient retention; phosphorus; nitrogen; catchment area factors; Anlagda våtmarker; näringsretention; fosfor; kväve; avrinningsområdesfaktorer;

    Abstract : Eutrophication, a surplus of nutrients, is a problem in aquatic environments and one of the Swedish Environmental Goals is that there should be no eutrophication caused by human activities. Constructed wetlands (CW:s) is a measure that could be implemented to decrease the transport of nutrients to water bodies through retention. READ MORE

  6. 5. Changing Agriculture : Stable isotope analysis of charred cereals from Iron Age Öland

    University essay from Stockholms universitet/Arkeologiska forskningslaboratoriet

    Author : Markus Eklund; [2019]
    Keywords : barley; wheat; oat; rye; carbon; nitrogen; isotope; FTIR; manuring; ecology; systems; networks; climate; resilience; entanglement; migration period; Sandby; Gråborg; Skedstad; Prästhag;

    Abstract : The Middle Iron Age on Öland (around 200-550 AD) is often regarded as a prosperous period witha wealth based on animal husbandry. In this study charred cereals from several Iron Age sites atÖland are studied to answer questions about prehistoric diet and agricultural practices. READ MORE