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.
2007
Forfattere
Einar Heegaard Rune Halvorsen Økland Harald Bratli Wenche Dramstad Gunnar Engan Oddvar Pedersen Heidi SolstadSammendrag
Det er ikke registrert sammendrag
Sammendrag
To stabilize organic cereal production systems it is necessary to control Canadian thistle (Cirsium arvense) and other perennial weed species. The aim of the two presented experiments (I and II) has been to evaluate the effects of mechanical treatment in spring combined with competition from a one season cover crop. In both experiments we used the same mixture of cover crops; phacelia (Phacelia tanacetifolia Benth.), common vetch (Vicia sativa L.), red clover (Trifolium pratense L.) and Italian ryegrass (Lolium multiflorum Lam.). The first experiment (I) was arranged in a complete factorial split-plot design. In this experiment different root burial depths and root lengths of C. arvense simulated different mechanical treatments. Use of cover crop was the single factor that most effectively reduced the gain of biomass of C. arvense. At the final harvest combined treatment of deep root burial (15 cm), short root length (5 cm) and cover crop reduced number of new shoots of C. arvense by 95% and root biomass by 97% compared to shallow burial and no cover crop. At minimum regenerative capacity of C. arvense the number of leaves were 2 to 6 for the treatment with cover crop and 4 to 8 for the treatment without cover crop. In the second experiment (II), which had a complete factorial design, ± ploughing in autumn was combined with different fallow strategies in spring before sowing the cover crop. The disc harrowing during the fallow period was performed either 2x when fallow lasted for 3 weeks, or 4x when fallow lasted for 6 weeks. Additionally, all combinations of ± ploughing in autumn and length of the fallow period were combined with ± ploughing before sowing the cover crop (all together 8 treatments). In two additional subplots shallow ploughing preceded the autumn ploughing treatment (± ploughing). Preliminary results from experiment II confirms in general the conclusions from experiment I. Combining soil tillage and competition from a fast growing cover crop have potential for retarding perennial weeds. The classical approach for controlling couch grass (Elymus repens) was confirmed in this experiment, the longer soil tillage period the better weed control, and the soil tillage period should be proceeded by a deep ploughing. Ploughing in the autumn gave no additional effect on couch grass. Best control of Canadian thistle was obtained when only shallow ploughing was performed in the autumn, followed by a 6 week soil tillage period (3 weeks was not tested here) in spring and early summer and completed by ploughing before sowing the green manure cover crop. In conclusion, the experiments showed that intensive soil tillage combined with competition from a cover crop gave promising results for weed control. Due to the positive effect of moderate tillage operations attention to factors as nutrient supply, soil structure and energy use may still be ensured while a satisfying weed control is obtained.
Forfattere
Bent J Nielsen Jens G Hansen Hans Pinnschmidt Ragnhild Nærstad Arne Hermansen Vinh Hong Le Asko HannukkalaSammendrag
Potato late blight experiments with spore release and viability under field conditions were presented
Forfattere
Christian Uhlig John Derome Mikko Kukkola Tiina Nieminen Maija Salemaa Heljä-Sisko HelmisaariSammendrag
The main aim of the research was to evaluate the success of the long-term recovery of heavy-metal polluted forest ecosystems through the establishment of a functioning organic layer, and through revegetation using seedlings of native trees and shrubs.
Forfattere
H.-S. Helmisaari M. Salemaa J. Derome O. Kiikkilä Christian Uhlig T.M. NieminenSammendrag
The main aim of this study was to determine how the application of a mulch cover (a mixture of household biocompost and woodchips) onto heavy metal"polluted forest soil affects (i) long-term survival and growth of planted dwarf shrubs and tree seedlings and (ii) natural revegetation. Native woody plants (Pinus sylvestris, Betula pubescens, Empetrum nigrum, and Arctostaphylos uva-ursi) were planted in mulch pockets on mulch-covered and uncovered plots in summer 1996 in a highly polluted Scots pine stand in southwest Finland. Spreading a mulch layer on the soil surface was essential for the recolonization of natural vegetation and increased dwarf shrub survival, partly through protection against drought. Despite initial mortality, transplant establishment was relatively successful during the following 10 yr. Tree species had higher survival rates, but the dwarf shrubs covered a larger area of the soil surface during the experiment. Especially E. nigrum and P. sylvestris proved to be suitable for revegetating heavy metal" polluted and degraded forests. Natural recolonization of pioneer species (e.g., Epilobium angustifolium, Taraxacum coll., and grasses) and tree seedlings (P. sylvestris, Betula sp., and Salix sp.) was strongly enhanced on the mulched plots, whereas there was no natural vegetation on the untreated plots. These results indicate that a heavy metal" polluted site can be ecologically remediated without having to remove the soil. Household compost and woodchips are low-cost mulching materials that are suitable for restoring heavy metal"polluted soil.
Forfattere
Jon Magne HoltenSammendrag
Spelthveten er nå godt kjent hos oss. Enkorn og emmer er to andre gamle, men lite kjente hvetearter som har gode egenskaper når det gjelder smak, ernæring og helse. Nyere norsk forskning har dessuten vist at personer med cøliaki bedre tåler enkorn og noen sorter av emmer.
Forfattere
Lars Tørres HavstadSammendrag
Veteranintervju med Jan Røyneberg, som etter 20 år som rensemester hos Felleskjøpet Rogaland Agder i Stavanger trer inn i pensjonistenes rekker.
Forfattere
Trond MæhlumSammendrag
Det er ikke registrert sammendrag
Forfattere
Trine EggenSammendrag
Viktige faktorer for rensing av miljøgifter i sigevann
Forfattere
Brita ToppeSammendrag
Gjennomgang av de viktiste sykdommer som spres med vanningsvann i veksthuskulturer og hvilke krav må en stille for å tilfrestillende desinfeksjon.