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
Forfattere
Arne BardalenSammendrag
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Sammendrag
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Forfattere
Trond Hofsvang Kjell Magne Olsen Pjotr Oosterbroek Louis BoumansSammendrag
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Forfattere
Bruce Talbot Rolf Björheden Asko Poikela Andis Lazdiņš Mariusz KopetzkySammendrag
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Sammendrag
We examine the origins, implications, and consequences of yield-based N fertilizer management. Yield-based algorithms have dominated N fertilizer management of corn (Zea mays) in the United States for almost 50 yr, and similar algorithms have been used all over the world to make fertilizer recommendations for other crops. Beginning in the mid-1990s, empirical research started to show that yield-based rules-of-thumb in general are not a useful guide to fertilizer management. Yet yield-based methods continue to be widely used, and are part of the principal algorithms of nearly all current “decision tool” software being sold to farmers for N management. We present details of the theoretical and empirical origins of yield-based management algorithms, which were introduced by George Stanford (1966, 1973) as a way to make N fertilizer management less reliant on data. We show that Stanford’s derivation of his “1.2 Rule” was based on very little data, questionable data omissions, and negligible and faulty statistical analysis. We argue that, nonetheless, researchers, outreach personnel, and private-sector crop management consultants were obliged to give some kind of N management guidance to farmers. Since data generation is costly, it is understandable that a broad, “ball park” rule-of-thumb was developed, loosely based on agronomic principles. We conclude by suggesting that technology changes now allow for exciting new possibilities in data-intensive fertilizer management research, which may lead to more efficient N management possibilities in the near future.
Sammendrag
The objective of this study was to make an overview assessment of the potential effects of intensified forest management, promoted by the Norwegian government as a climate mitigation measure, on water quality in Norwegian surface waters. This study evaluated the following measures for forest intensification: (i) afforestation, (ii) intensification of planting and (iii) nitrogen fertilization shortly before harvest. A substantial literature review was made and a further development of the DWARF- framework tailored for Norwegian conditions provided the base for the study. The assessments were made based on the potential effects after forest harvest, using different management strategies like stem-only harvest and whole-three harvest. The potential effects were analysed on multiple parameters with focus on acidification, eutrophication, heavy metals, and carbon sequestration. The study used temporal resolution to address what effects the forest management practices might lead to 1, 10 and 100 years after harvest. This study concludes that there will be trade-offs between transitioning to a low carbon society and water quality, and the severity of effects may differ if they are evaluated on an annual, decadal or century scale.
Forfattere
Anna Birgitte MilfordSammendrag
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Forfattere
Live Lingaas Nesse Anne Marie Bakke Trine Eggen Kristian Hoel Magne Kaldhusdal Einar Ringø Siamak Pour Yazdankhah Erik-Jan Lock Rolf Erik Olsen Robin Ørnsrud Åshild KrogdahlSammendrag
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Forfattere
Knut ØistadSammendrag
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Forfattere
May Bente BrurbergSammendrag
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