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.
2008
Sammendrag
Due to a late harvesting season compared to that found in other European countries, the sweet cherry industry in Norway is now expanding, aiming for export markets. Cultivars producing high quality fruit that ripen late (late July and throughout August) and that are suitable to grow in high density production systems are sought. In addition, early ripening cultivars are sought for local marketing in early and middle July. Testing cultivars and advanced selections has been carried out at Ullensvang Research Centre since 1959. During the last decade, 130 cultivars and advanced selections have been included in the testing program. Important parameters like fruit size, fruit firmness, low fruit cracking, high and precocious yield, fresh appearance and good flavour have been evaluated. Based on the results from this testing program, the following cultivars are currently recommended: a) for early season: `Burlat", `Moreau" and `Merchant", b) for mid-season: `Giorgia", `Chelan", `Samba", `Techlovan" and `Van", c) for late season: `Lapins", `Kordia", `Regina" and `Sweetheart".
Sammendrag
Some high density sweet cherry orchards in Norway suffer from decay of trees resulting in death or reduced vigour of trees. A survey monitoring healthy and infected trees from several orchards found differences between cultivars and rootstocks in sensitivity of tree decay. In order to investigate this cherry tree decay further, new field trials were established in 2002 with trees of the cultivar Van grafted on the two rootstocks Prunus avium seedling and Colt and trained as central leader trees. Two parallel trials were planted; one in the soil of an old cherry orchard and the other in the soil from agricultural land where no fruit production had been conducted in advance. During the first years significant larger annual vegetative growth measured as trunk girth, annual shoot growth and leaf areas were registered from the trees growing in the virgin soil. In the replanted cherry soil, trees grafted on the rootstock Colt grew more vigorously than the seedling rootstock based on leaf areas and shoot growth measurements. The rootstock Colt may be the answer for avoiding cherry replant diseases.
Sammendrag
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Sammendrag
In order to improve the basis for utilizing white clover (Trifolium repens L) in northern agriculture, we studied the effects of defoliation intensity on spring growth in a sub-arctic climate in relation to carbohydrate and nodule status. White clover plants (cv Snowy) were studied in a pot experiment in the field on the coast of northern Norway from spring 2001 until spring 2002. The experiment was repeated with some modifications from spring 2002 until spring 2003. During the growing season from summer to autumn, the plants were totally stripped of leaves down to the stolon, cut at four or seven cm height or left undisturbed. The plants were sampled destructively in autumn, early spring and late spring and sorted into leaves, stolons and roots. The plant material was weighed and analysed for carbohydrate reserves and nodule number. Defoliation during the growing season resulted in reduced concentration of reserve carbohydrates in autumn and reduced winter survival of the stolons. The most severe defoliation treatment reduced the herbage growth in spring. In contrast, the two milder defoliation treatments had no effect on herbage growth during spring or on total plant dry matter and nodule status in late spring. In conclusion, moderate defoliation during the growing season had no effect on herbage growth the following spring nor on carbohydrate, nodule or dry matter status of the plant in late spring. Moderate defoliation increased spring growth and thereby also the nitrogen demand of the plants. This probably enhanced nodule formation and development of inactive to active nodules.
Sammendrag
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Sammendrag
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Sammendrag
I Norge er det i enkelte utredninger sett på hvorfor bønder har sluttet med økologisk produksjon (for eksempel Thomlevold et al., 2007). Det er så langt ikke gjort noen vitenskapelige studier på området. Vi vet f.eks. ikke om de som har sluttet har vendt tilbake til konvensjonell drift, om de har avviklet gardsdrifta, eller om de fortsatt driver tilnærmet økologisk, men ønsker å stå utenfor Debio-ordningen. Mer kunnskap om emnet vil gjøre det lettere å utarbeide strategier, virkemidler og tiltak for å motivere flere bønder til å fortsette med økologisk drift. Hovedmålet i prosjektet er å undersøke årsaker til at noen bønder slutter med Debio-godkjent økologisk produksjon mens andre fortsetter. I dette notatet vil vi gjennomgå alle resultater fra spørreundersøkelsen om utfordringer ved økologisk gardsdrift. Skjemaet ble sendt både til gardbrukere som har sluttet med Debio-godkjent økologisk drift, og til et utvalg av de som fortsatt driver økologisk. Vi beskriver først datainnsamlingen, bruksutvalget, gruppeinndelinger og statistiske analysemetoder. Deretter presenteres resultater fra spørreundersøkelsen, i hovedsak spørsmål for spørsmål. Til slutt presenteres opplysninger om arealer og dyretall på brukene på grunnlag av produksjonstilskuddsdatabasen til SLF (Statens landbruksforvaltning).
Sammendrag
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Sammendrag
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Forfattere
Martha Ebbesvik Sissel Hansen Anne Kjersti Bakken Turid Strøm Espen Govasmark Håvard SteinshamnSammendrag
Innholdet av råprotein i en stor del av graset fra førsteslåtten på økologiske ku- og sauegårder var lavt. Innholdet i andreslåtten var høyere. Kløverandelen i engavlinga forklarte en stor andel av variasjonen i proteininnholdet.