Hopp til hovedinnholdet

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

The Christmas tree seedlings typically appear with initial slow growth during the first 2-3 years. In the next couple of years the trees grow well, and then during the final 2-3 years before harvest the growth frequently is too vigorous. This growth rhythm often requires laborious growth regulation by mechanical or chemical methods. A dense concentration of branches on the lower part of the tree tends to allocate a lot of resources to the tree base, which grows wide and heavy. Such trees are costly to cut and transport and difficult to sell. Therefore, the growers want transplants with rapid growth after planting. To satisfy their demand there is a need for better plant materials than what are available today. More knowledge is needed about the relation between seedling quality, their physiological status and the plants response to different planting dates. In the year 2007 a new project "Seedling qualities and establishment routines for a rapid growth start of Abies nordmanniana and Abies lasiocarpa for Christmas tree production" was established in Norway to improve our knowledge of establishment of Christmas trees. Financial support is given by the Norwegian Research Council, "Skogtiltaksfondet" and "Forskningsfondet for Norsk Pyntegrønt Forsøksring".

Sammendrag

Abstract: A series of experiments were conducted to examine the interactive effects of an organic ligand, a competing cation, and PH on the dissolution of zinc (Zn) from three California soils, Maymen sandy loam, Merced clay, and Yolo clay loam. The concentrations of soluble Zn of the three soils were low in a background solution of Ca(NO3)(2). Citric acid, a common organic ligand found in the rhizosphere, was effective in mobilizing Zn in these soils; its presence enhanced the concentration of Zn in soil solution by citrate forming a complex with Zn. The ability of Zn to form a complex with citric acid in the soil solution was dependent on the concentration of citric acid, PH, and the concentration of the competing cation Ca2+. The PH of the soil solution determined the extent of desorption of Zn in solid phase in the presence of citric acid. The amounts of Zn released from the solid phase were proportional to the concentration of citric acid and inversely proportional to the concentration of Ca(NO3)(2) background solution, which supplied the competing cation Ca2+ for the formation of a complex with citrate. When the soil suspension was spiked with Zn, the adsorption of Zn by the soils was retarded by citric acid via the formation of the soluble Zn-citrate complex. The dissolution of Zn in the presence of citric acid was PH dependent in both adsorption and desorption processes.

Sammendrag

Stor avling, høg fôrkvalitet og lite utsett for hjorteskade. Det er tre viktige stikkord om grasarten raisvingel. Artikkelen tek føre seg Karl Andre Gjelsvik i Askvoll kommune sine praktiske dyrkingserfaringar med raisvingel. I 2008 skal han hausta 50 daa med Hykor raisvingel tre gonger. Erfaringane hans er at Hykor overvintrar svært godt, toler mange slåttar og kan utnytte vekstsesongen noko betre enn tradisjonelle timotei-engsvingelblandingar. Førsteslåtten i 2007 gav knappe 900 fôreiningar pr daa, med ein FEm-verdi på 0,93. Gjødsling, fôrverdi og gjæringsresultat for tre slåttar i 2007 er gitt.

Sammendrag

Det vert gjort greie for oppnådde avlingar og avlingskvalitet gjennom fire år i eit økologisk vekstskifte. Resultata er lagde til grunn for ein diskusjon om høveleg avdråttsnivå og dyretal på eit mjølkeproduksjonsbruk der målsetjinga er å vere sjølvforsynt med fôr. På det gitte naturgrunnlaget såg det ut til å vere muleg å produsere 500-600 kg mølk per dekar og år.

Sammendrag

Artikkelen omtalar korleis eit venta mildare og våtare klima med større svingingar mellom frost og varme, vil påverka overvintringa i gras. Slike problemstillingar blir studert ulike stader i landet i eit prosjekt i Bioforsk. Milde haustar gir dårleg herding av graset, og både i Tromsø (Holt) og i Fjaler (Fureneset) såg ein at graset tolde mindre frost om vinteren etter milde og våte haustar samanlikna med kaldare og tørrare vér. På same vis vil herdinga påverka kor lenge grasplantene held på frosttoleransen. Utviklinga i timotei og fleirårig raigras varierer gjennom vinteren. Timotei samlar opp meir karbohydrat enn fl.årig raigras, men ikkje minst er plantesvinnet om vinteren mykje mindre i timotei slik at arten har meir tilgjengelege næringsreservar om våren enn fleirårig raigras.

Sammendrag

Resultat frå ni feltforsøk kan tolkast slik at ein bør velje timoteisortar som utviklar generative skot i gjenveksten dersom ein vil maksimere avlingsmengda. Men ein må også ta omsyn til at fôrverdien minkar sterkt ved aukande mengd generative skot. Ein bør tilrå å hauste gjenvekst av "Grindstad" tidleg dersom ein vil leggje stor vekt på fôrverdi. Ein må understreke at i desse forsøka har ein ikkje undersøkt korleis haustetida for andreslått verkar på overvintringa av grassvoren. Det må ein også ta med i vurderinga når ein skal bestemme val av timoteisort og haustetid.

Sammendrag

The aim of this work was to find methods of producing red raspberry long canes of good quality in a Northern climate with a short growing season. Plants of two red raspberry cultivars ("Glen Ample" and "Glen Moy") were produced from roots in February and March. The plants were left in a greenhouse during spring. During summer the plants were placed in three different environments: outdoor, under rain cover and in polyethylene tunnels; and in December, the plants were moved into cold store (-1o C). The plants had one cane each. They were taken out of cold store at two times: 15 May and 15.June and placed into a plastic tunnel for berry production. The experiment was carried out at two different places and replicated twice. The best development of long canes was obtained by growing them in polyethylene tunnel during summer and autumn the first year. These plants also developed more laterals and flowers per laterals, and gave the highest yield. The plants grown under rain cover gave higher yield than plants grown outdoors. Prolonging the cold storage of the plants from 15 May to 15 June reduced the yield by 22 %. The reduction in yield was first of all a result of a reduction in the number of berries. The cultivar "Glen Ample" gave higher yield than cv. "Glen Moy" in all treatments. Based on the results of these experiments, use use of polyethylene tunnels or rain cover for long cane production of red raspberry in Northern climate with short growing season is recommended. Delaying the harvest season by prolonging the cold storage period in spring reduced the yield, but higher prices in autumn may make it profitable.