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.
2009
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Sissel Hansen Marina BlekenSammendrag
The sources of N2O in agricultural soil and strategies to reduce emissions are summarised. The main source of N2O in agricultural soil is denitrification. Conditions for N2O emissions are readily available nitrogen (mainly NO3), a partly anaerobic environment, and readily available carbon. The portion of N2O is greatest with low pH. To decrease N2O emissions from agriculture it is important to increase utilisation of applied nitrogen. Improved utilisation of available manure, reduced nitrogen surplus and improved growth conditions such as soil structure, drainage, and pH are important in this. Data from a longterm field trial with different fertilization and soil compaction are presented. The soil was experimentally compacted by two passes with a tractor, wheel by wheel, shortly before fertilization. Gas fluxes at the soil surface were measured by the soil cover method. In the NPK treatment, soil compaction by tractor traffic in this moist soil increased by two- to threefold the observed N2O emissions per kg of dry matter of feed produced. In cattle slurry treatments the effects of soil compaction on N2O emissions were less pronounced. The observed N2O emission per ha and per unit of production were higher with conventional fertilization than with fertilization adapted to organic dairy farming.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Agnethe ChristiansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Ragnar EltunSammendrag
In Norway straw is used for animal bedding, feed and an increasing amount is used for heat production. Very little information is available on the total amount of straw that is available for heating. In a project started in 2008 we aim to calculate the total resources of straw in Norway, and how much of this that can be used for heating, taking into considerwqtion the need for other purposes and the effect of removal of straw on soil quality parameters such as structure and content of carbon and potassium. Straw yields are measured in field trials in cereal production areas of Norway. Preliminary calculations indicate that straw can be an important source of energy also in Norway.
Forfattere
Ragnar EltunSammendrag
Det er ikke registrert sammendrag
Forfattere
Arnfinn Nes Muath Alsheikh Ragnhild Sween Magne GullordSammendrag
Scandinavian countries, including Norway, is in marginal areas for commercial strawberry production, but the culture is still an important hortucultral crop. There is an increasing demand for new and better cultivars for the regional conditions in the industry. The Norwegian strawberry breeding program has lasted more than 40 years and several cultivars have been released. In 2002 the National Norwegian strawberry breeding program was privatized to Graminor Breeding Ltd. The program has responsibility to supply the Norwegian market with new well-adapted and productive strawberry cultivars with high berry qualities, in order to add to the profitability of the growers. Graminor Breeding Ltd. is also representing foreign cultivars in Norway. Three new cultivars have been launched in 2007: "Gudleif", "Iris" and "Blink".
Forfattere
Arne StensvandSammendrag
Det er ikke registrert sammendrag
Forfattere
Robert C. Seem Arne Stensvand David M. Gadoury Håvard Eikemo Andrew Dobson M. Catherine HeidenreichSammendrag
The objective of this work was to investigate how primary disease levels of powdery mildew (Podosphaera aphanis) in strawberry (Fragaria × ananassa) influence disease development in time and space. Experiments were repeated over two seasons in field trials in Norway (Ås, cv. Korona) and USA (Geneva, NewYork, cvs. Earliglow and Elan). Five-row plots of 50 to 100 mildew-free plants (planting distance 0.45 x 1.2 m) were established each year within large grain fields, with a minimum distance of 90 m between plots, and no fungicide treatments. At start of the experiments, plants at the center of each plot were inoculated with 0, 1, 10, or 100 mildew-infected leaflets. Uninoculated plots developed only trace levels of powdery mildew, despite nearby diseased plots. More rapid and severe disease development was observed in the inoculated plots; e.g., mildew was observed on 31, 36, 311, and 912 leaflets in the 0, 1, 10, and 100 plots, respectively, in Norway in year 1 of the trial. Within the plots, disease development was highest close to the inoculum source and downwind from the prevailing wind. It may be concluded that in the absence of nearby sources of contamination, disease severity in strawberry plantings is determined by the dose of initial inoculum resident within the planting. The practical impact of the trials was to demonstrate long-lasting benefits of clean, mildew-free planting stock in commercial strawberry production, even in areas where the pathogen is endemic and the environment is very conducive to disease.
Forfattere
Mette ThomsenSammendrag
At bregnen strutseving er spiselig er ikke så godt kjent. At den også er en svært næringsrik plante burde få flere til å bruke den. Strutseving er en godt synlig bregne i den norske natur. Den kan bli rundt 2 m høy og vokser ofte i store grupper. Den forekommer i lavlandet i det meste av Norge, men er mindre vanlig i ytre Agder, Rogaland og Finmark (Lid og Lid 1994). For øvrig forekommer den sirkumboreal i et belte rundt den nordlige halvkulen gjennom Europa, Asia og Nordamerika. Det latinske navn er Matteúccia struthiópteris (L.) Tod. På norsk kjennes planten bl.a. under navnet strutseving eller bispestav, og på engelsk Ostrich fern og "fiddleheads". Strutseving og Ostrich fern kommer fra det latinske struthiópteris og refererer til formen på de utvokste bladene, mens navnet bispestav og det engelske fiddelheads viser til formen på de spiselige nye skudd. http://www.skogoglandskap.no/Artsbeskrivelser/strutseving