Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2002
Sammendrag
Det er ikke registrert sammendrag
Forfattere
O. Kiikkilä J, Derome T. Brügger Christian UhligSammendrag
In order to assess the success of in situ remediation of coniferous forest soil polluted by a Cu-Ni smelter, the total Cu concentration in soil percolation water, the fluxes of Cu down through the soil profile, and the toxicity of soil percolation water to soil bacteria was studied. Total Cu in percolation water was also fractionated into free ionic and complexed forms. The toxicity of the percolation water was measured by the [3H]-thymidine incorporation method, which measures bacterial growth rates. Soil percolation water was collected during one growing season by zero tension lysimeters inserted in the soil at 0.2 and 0.4 m in the soil. The treatments consisted of a control, mulch application to the forest floor (M) and a mulch application after removing the polluted organic soil layer (MR). The mulch consisted of a mixture of compost and woodchips (1/1; vol/vol). Analyses of Cu species and dissolved organic carbon (DOC) indicated that DOC leached from the mulch and complexed Cu into forms that were less toxic to soil bacteria. At 0.2cm depth percolation water toxicity was 19% lower in the M and 42% lower in the MR than in the control. Toxicity correlated with the Cu2+ concentration, which was 61 and 84% lower in the M and MR treatments, respectively, compared to the control. However, there were signs that total Cu had leached down through the soil profile, the leaching being more pronounced in the MR treatment.
Sammendrag
This study shows that it is questionable if critical load modelling can contribute in the search for harmful effects of acid deposition on forest health at present. Critical loads for S and N deposition were calculated using the MAGIC and PROFILE models for more than 100 monitoring plots in Norway spruce forest in south-east Norway. The two models gave different results, likely due to differences in the models, including differences in the time spans applied. The PROFILE model gave considerably more plots with exceedance than the MAGIC model. At plots where the CL was exceeded, calcium/aluminium (Ca/Al) ratios in the soil solutions were low. However, very few of these plots had possible harmful values of the Ca/Al-ratio. More than 50 yr seems in most cases to be needed to bring Ca/Al ratios below 1.0. Present deposition was better correlated with measured forest condition variables such as crown condition and needle chemistry, than with modelled exceedance according to any of the two methods. The deposition of S and N was weakly, negatively correlated to foliar concentrations of P and Ca, and positively to foliar N concentrations and crown density.
Forfattere
May-Guri SaethreSammendrag
Det er ikke registrert sammendrag
Forfattere
Hugh RileySammendrag
§ Bruk av husdyrgjødsel er sammenlignet med ulike kombinasjoner av N, P og K i mineralgjødsel på morenejord i Vang, Hedmark, siden 1922. Avlingsresultater for de siste fem årene er presentert her. § Avlingene uten gjødsel ligger i snitt på halvparten av nivået som en fikk ved bruk av 10 kg N, 2,5 kg P og 12 kg K pr. dekar § Av enkeltstoffene gav bruk av nitrogen fortsatt størst avlingsøkning, etterfulgt av fosfor og så kalium. Begge de sistnevnte viste positivt samspill med nitrogen § Ved bruk av fastgjødsel fra en biodynamisk gård, gav årlige mengder av 2, 4 og 6 tonn pr. dekar henholdsvis 84%, 94% og 97% av avlingsnivået en fikk med mengdene N, P og K som er nevnt ovenfor, gitt i mineralform § Balanse mellom tilførsel og bortførsel av nitrogen fikk en ved bruk av noe over 5 kg N/daa/år i mineralgjødsel, og med noe under 2 tonn husdyrgjødsel/daa/år
Forfattere
Nina Elisabeth NagySammendrag
Det er ikke registrert sammendrag
Sammendrag
Isoproturon is a herbicide which is fairly soluble in water and is considered a risk compound for leaching to surface and ground water. The fungicide metalaxyl is even more water soluble than isoproturon and can be rapidly leached from sandy soil that are low in organic matter. Transformation rates of isoproturon and metalaxyl in a silty clay loam and a sandy loam from Norway have been studied in the laboratory as well as in the field. Production of the metabolites monodesmethyl-isoproturon, didesmethyl-isoproturon and the acid-metabolite of metalaxyl were also monitored.
Sammendrag
Degradation and dissipation studies in laboratory and field were performed with isoproturon (IPU) to produce data for modelling the fate of an autumn applied pesticide in a Gleyic Podzoluvisol in Norway. Transformation rate studies of IPU in the laboratory displayed a half-life of 13 days in the topsoil (0-20 cm) and 21 days in the subsoil (20-40 cm) at 20 degrees C. The production of two major metabolites were also studied. In the field, less than 9% of the IPU applied leached further than 20 cm. The half-life of IPU in the field was 21 days.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Erling StubhaugSammendrag
Tilleggsgjødsling med 25 kg MultiKMg kombinert med bladgjødsling med Wuxal kalsium (0,5 l pr. dekar) gav den friskeste og kraftiste risvekstenø, og også den største avligen, spesielt i den største sorteringen. Dette forsøksleddet hadde også mindre stengelråte. Nye og mer omfattende utprøvinger vil bli gjort i 2002-sesongen.