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.
2019
Sammendrag
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Forfattere
Ievina SturiteSammendrag
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Sammendrag
In organic plant production, nitrogen (N) availability is often a growth-limiting factor. Under such conditions, off-farm waste-derived nutrient resources may be an alternative to meet the N demand. In this study, we described a production method for a shrimp shell (SS) pellet Product and evaluated the N fertiliser effect and N recovery efficiency (NRE) in a controlled climate pot experiment with potatoes. The experiment was set up with low, medium and high N levels of SS pellets in comparison with a standard mineral fertiliser (MF) at 9°C, 15°C and 21°C. In a separate study, we examined the loss of N as N2O from SS pellets in comparison with SS powder in a 100 days incubation experiment. The results documented the possibility to formulate a fertiliser pellet product from SS, and that SS pellets were an effective N fertiliser in potato at all Growth temperatures. Nevertheless, a slightly slower development and lower tuber yields than for MF indicated a delayed N-availability from SS pellet fertiliser. NRE after use of MF was around 90%, and about 70% for the different levels of SS pellets. The incubation experiment showed a higher rate of available N for SS powder than for pellets (67% and 39%, respectively) after 100 days of incubation at constant humidity and temperature. This difference was attributed to a lower degree of dissolved materials and a higher rate of denitrification and N2O emissions for pellets than for powder, probably caused by differences in physical properties, occurrence of anoxic hotspots and higher microbial activity around and inside the SS pellets.
Forfattere
Ralf RautenbergerSammendrag
Det er ikke registrert sammendrag
Forfattere
Micky Allen Harold E. BurkhartSammendrag
An understanding of relationships between stand volume growth and stand density is important for making informed management decisions. Contradictions concerning these relationships have been attributed to differences in definitions of volume growth and stand density, among other pitfalls. Models were developed to test growth-density relationships using past-growth data from three thinning studies in 11- to 41-year-old loblolly pine (Pinus taeda L.) plantations. Relationships between gross growth and stand density measures of basal area per hectare, stand density index, volume per hectare, and relative spacing were compared. Relative growth-density relationships were also compared by relating the growth and density of thinned plots to unthinned plots. Analyses indicated that gross volume growth increases with increasing stand density when accounting for age, quadratic mean diameter, and site quality. Results from relative growth-density relationships suggested that thinned stands can exhibit increased growth at relatively lower densities compared to that of an unthinned stand on a similar site. The fitted models, across all four density measures, indicated ever-increasing gross volume growth with increasing stand density within the range of observed data for loblolly pine plantations.
Sammendrag
Jæren er en av de mest konsentrerte jordbruksregionene i landet. Samtidig opplever regionen sterk vekst i industri og folketall. Regionen har som følge av dette stått for den største nedbygginga av jordbruksareal de siste ti åra. Det er samtidig vanskelig å finne alternativer som kan kompensere for nedbygging av jordbruksareal. Rapporten gir en oversikt over jordbruksareal og dyrkbar jord i planområdet, og kvaliteter ved jordbrukets ressursgrunnlag i regionen. Rapporten gir også en oversikt over bruk av jordbruksarealene, omdisponering og nedbygging av jordbruksareal i regionen, og mulige kompenserende tiltak knyttet til dette.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Trygve S. Aamlid Pia Heltoft Thomsen Tatsiana Espevig Wendy Marie Waalen Anne Mette Dahl Jensen Gudni Thorvaldsson K. SintornSammendrag
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Forfattere
Trygve S. Aamlid Pia Heltoft Thomsen Tatsiana Espevig Wendy Marie Waalen Anne Mette Dahl Jensen Gudni Thorvaldsson K. SintornSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag