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.
2002
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No abstract has been registered
Abstract
The purpose of this study was to test the activity of gibberellins and auxins for induction of parthenocarpic fruit development in cloudberry, Rubus chamaemorus L., a dioecious, northern wild berry with potential for cultivation. Plant hormones were applied directly to open flowers, either dissolved in ethanol or as an aqueous spray. Of the tested gibberellins (GA1, GA3, GA4, dimethyl-GA4, GA5, GA9, GA19, GA20 and GA24) only GA1, GA3, GA4 and dimethyl-GA4 were active and induced fruit development comparable to development of pollinated fruits. Lack of activity of GA20 and GA9, the immediate precursors of GA1 and GA4, respectively, suggests that 3 b-hydroxylation of gibberellins can be inhibited in unpollinated flowers of cloudberry. Auxin treatments induced an initial fruit development, but did not result in ripe berries. Based on these results, use of transgenic methods to regulate gibberellin or/and auxin biosynthesis in carpels of cloudberry could be used to develop a parthenocarpic cloudberry.
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No abstract has been registered
Authors
Vibeke LindAbstract
No abstract has been registered
Authors
Ola FlatenAbstract
No abstract has been registered
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Årleg turrstoffproduksjon vart estimert frå åtte år gamle epletre med sortane "Fuji", "Royal Gala" og "Braeburn" poda på grunnstamma M9 og forma som slank spindel. Både frisk- og turrstoffproduksjon auka liniært med mengda av ljos som vart oppfanga i trea. Denne samanhengen tilsvarar ei avling på 16.9 tonn pr. daa med ei ljosoppfanging på 90 %. Energien som vart omdanna frå ljos i vekstsesongen til turrstoff i New Zealand var tilsvarande som i England. Skilnaden mellom desse to landa er at New Zealand har ein lengre vekstsesong og høgare innstråling. Turrstoffproduksjonen var fordelt til frukt, treaktig vev og blad med ei fordeling til frukt på 74, 72 og 63% for dei tre sortane "Braeburn", "Fuji" og "Royal Gala".
2001
Academic – Rural economic development and its influence on forest policy in Norway
Birger Vennesland
Authors
Birger VenneslandAbstract
The connection between rural economic development policy and forest policy in Norway during the past decades is discussed. Because of this connection it is debatable whether it is reasonable to maintain a strong focus on timber supply in Norwegian forest policy in the future. By analyzing studies related to forestry in the context of rural development, the lack of combined rural development research and forestry research is shown. It is argued that rural policy/research and forest policy/research should be combined in the future regarding topics related to forestry in the field of rural development.
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No abstract has been registered
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Farmers in northern Norway have experienced frequent winter damages of grassland, especially on flat areas and peat soils. The use of open ditches and surface grading has become the common method to drain such fields and for reclaiming new land with such characteristics. We designate this as surface grading in this paper. An investment analysis is carried out to explore the profitability of this method. This analysis indicates that the method is profitable from the farmers’ point of view. However, the conclusions are sensitive to changes in crop yields and the value of the yields. The cost of a winter damage and thus an unplanned reseeding is high for young leys, but is small for leys approaching the optimal replacement age.
Authors
Mekjell MelandAbstract
An intensive field planting of `Edda", "Opal" and "Mallard" plum trees (Prunus domestica L.) all grafted on the semidwarf rootstock St. Julien A was established in 1993 at Ullensvang Research Centre, western Norway at 60 ° North. The objectives were to evaluate four different single row planting systems (vertical axis, free spindle, hedgerow and Y-trellis) and three planting densities ( 0.5, 1.0, 1.5 x 4 m for the Y-trellis and hedge trees and 2.0 x 4 m for the central leader trees) in a northern climate. These planting distances give a range of tree density of 1250 - 5000 trees per ha. The experiment gave a small yield in the third leaf on all canopy systems. During the first four cropping years, the yields/ha were positively correlated with tree density. Cumulative yield per hectare was highest on the Y-trellis and hedge trees with the highest density (5000 trees per ha). In the fourth leaf, the Y-trellis trees gave 15 tons per hectare. No differences in fruit size or the soluble solids content among canopies or densities were found.