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.
2015
Forfattere
Ketil HaarstadSammendrag
The plant P uptake from sewage sludge and biochar was investigated in pot experiments after manipulating the waste pH by mixing with acidic compost leachate or high pH concrete waste at two levels. Available P was measured both wit passive DGT samplers and by P uptake in rye grass during three harvests. The treatment pH in waste was about 4 after waste was mixed with leachate, and 11.5 with concrete waste. The pH in the pot during grass production was approximately 6.5. The P uptake was significantly higher in the treated biochar pots, both after high and low pH treatment. The more extreme pH treatments gave the highest uptake. The DGT uptake gave the same broad picture for pots with biochar but not for pots with sludge. DGT uptake showed less diffenece between high and low pH treatments. The passive samplers correlated relatively well with the measured grass uptake.
Sammendrag
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Sammendrag
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Forfattere
Callum Aidan Stephen HillSammendrag
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Forfattere
Alessandra Lagomarsino Alessandroelio Agnelli Roberta Pastorelli Grazia Pallara Daniel Rasse Hanna Marika SilvennoinenSammendrag
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Forfattere
Paul Eric Aspholm Aune Veersalu Lars Ola Nilsson Bjørn Mejdell Larsen Guttorm Christensen Patrik OlofssonSammendrag
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Sammendrag
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Forfattere
Lars Aksel OpsahlSammendrag
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Sammendrag
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Forfattere
Erik Biørn Hild-Marte BjørnsenSammendrag
Some labour market consequences of transitions in the agriculture sector are examined by combining 20-year unbalanced panel data from Norwegian farm households and logit modeling of transition probabilities. The multi-dimensionality of the problem follows from two decision makers having four possible choices in each period: the farm operator and spouse can be working fully on the farm or having supplementary outside occupation. Transitions are modeled by five logit models. The most flexible model has a high number of parameters. Overall, the results indicate that transitions have mainly been directed towards the state where both partners work off the farm. An increasing livestock reduces the probability of moving to states with substantial off-farm labour participation. Increasing farm size tends to have the opposite effect. Recent on-farm investments come out with ambiguous effects. Having children seems to motivate operators to withdraw from off-farm labour and spouses to stay in or enter off-farm employment.