Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
1997
Authors
Jorunn Elisabeth Olsen Olavi Junttila Jarle Nilsen M. E. Eriksson Inger Martinussen Olaf Olsson Göran Sandberg Thomas MoritzAbstract
Resultatene i arbeidet indikerer at den fotoperiodiske responsen hos tre kan være regulert av mengde PHYA genuttrykk, og at mengden av fytokrom A påvirker metabolismen av GAs (gibberelliner) og IAA (auxin).
Abstract
No abstract has been registered
Authors
Nina JohansenAbstract
Developmental time and survival of eggs, larvae, pupae and adult females of the cabbage moth, Mamestra brassicae (L.) (Lepidoptera: Noctuidae) were investigated at different temperatures within the range of 5 to 23oC. In addition, the influence of temperature during the larval period on the weight of the succeeding pupae was studied, as well as the effect of temperature on fecundity of adult females. The lower developmental thresholds (Tb) and thermal requirement (DD) were established for all developmental stages and the larval instars using linear regression analysis. Tb and DD were 8.6°C and 75 degree-days for eggs, 5.4°C and 496 degree-days for the total larval period, 7.2°C and 304 degree-days for pupae, and 5.0°C and 56 degree-days for adult females, respectively. Pupal mortality was low at all temperatures. The survival of eggs and larvae was highest at 18oC, whereas mortality was 100% at 8.5oC. Larval mortality was highest in the first instar and decreased with increasing age. Pupae gained the highest weight when the larvae were reared at 18oC, and decreased with declining temperature. Temperature had no significant effect on total fecundity or fertility. Fecundity was basically unimodal distributed at all temperatures. At low temperatures the egg deposition period was markedly prolonged.
Authors
Nina JohansenAbstract
No abstract has been registered
Authors
Hans Fredrik Hoen Birger SolbergAbstract
No abstract has been registered
Authors
Birger Solberg Asbjørn SvendsrudAbstract
Artikkelen gir en oversikt over utviklingen i norsk skogforskning sid en 1927. A review is given of the development of forest research in Norway sin ce 1927.
Authors
A. Tietema C. Beier P. H. B. deVisser B. A. Emmett P. Gundersen O. Janne Kjønaas C. J. KoopmansAbstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
Arild Vatn Lars R. Bakken Halstein Lundeby Eirik Romstad Per Kr. Rørstad Arild Vold Peter BotterwegAbstract
This paper analyses a set of policy measures oriented towards reduc ing losses of nitrogen, phosphorus, and soil from agricultural land . An interdisciplinary modelling system- ECECMOD - is presented a nd a set of policy scenarios analysed. The analyses are oriented towards comparing the effects of input-oriented measures (fertilise r taxes) and policy measures directed towards more direct changes in the agronomic practices conducted on the farm. The effects on emission levels, abatement costs, and distributional effect s are documented. The trade-offs between precision and regulation costs are discussed.
Abstract
No abstract has been registered