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.
2010
Forfattere
Tatsiana Espevig Michelle DaCosta Chenping Xu Lindsey Hoffman Trygve S. Aamlid Anne Marte Tronsmo Bruce B. Clarke Bingru HuangSammendrag
Freezing tolerance is a major component of winter hardiness of perennial grasses. Velvet bentgrass showed the same freezing tolerance as creeping bentgrass. Acclimation at temperatures above 0 ºC was associated with accumulation of nonstructural carbohydrates and enhanced plant survival after freezing. Acclimation at 2 ºC for 4 wk was more effective than for 2 wk and resulted in higher concentrations of fructans. Additional subzero acclimation at -2 ºC resulted in a reduction in fructans and higher concentration of reducing sugars; however, there was no additional improvement in freezing tolerance. Protein analysis was performed using 2-D polyacrylamide gel electrophoresis. Nineteen protein spots were responsive to acclimation. Thirteen proteins were identified. Identified proteins belonged to metabolism, energy, disease/defence, and secondary metabolism functional groups.
Forfattere
Mats Høglind Ann NorderhaugSammendrag
Klimaendringer og konsekvenser for stølslandskap - utviklingstrekk og tiltak.
Forfattere
Ann Norderhaug Ellen SvalheimSammendrag
Handlingsplan for slåttemark.
Forfattere
Tatsiana Espevig Michelle DaCosta Trygve S. Aamlid Anne Marte Tronsmo Bruce B. Clarke Bingru HuangSammendrag
Cold acclimation plays a decisive role in turfgrass winter survival. This study was performed in collaboration with Rutgers University and University of Massachusetts (USA) to examine changes in carbohydrate levels in crown tissues during the first and second phases of cold acclimation in velvet bentgrass (Agrostis canina L.) and creeping bentgrass (A. stolonifera L.), and their association with freezing tolerance.. Four treatments representing different phases of cold acclimation were compared: (i) nonacclimated plants maintained at 18 °C/12 °C (day/night); (ii) plants acclimated at 2 °C for 2 wk and 250 μmol m-2 s-1 for 12 h photoperiod ; (iii) as treatment (ii) but for 4 wk; and (iv) as treatment (iii) plus additional sub-zero acclimation in the dark at -2 °C for 2 wk. Velvet bentgrass and creeping bentgrass showed no difference in lethal temperatures for 50% of the test population (LT50) as estimated by whole plant survival. Acclimation at 2 °C for 2 and 4 weeks resulted in accumulation of sucrose and fructans, and significantly lowered LT50 as compared with nonacclimated plants. Subzero acclimation resulted in less fructans, no difference in sucrose, and higher concentration of reducing sugars, but LT50 was not lower than after acclimation at 2 °C for 4 weeks.
Forfattere
Trygve S. Aamlid Oiva NiemeläinenSammendrag
The plant growth regulator trinexapac-ethyl (TE) has been evaluated in five registration trials in Finland and Norway. In 2007, TE was applied monthly at rates 0.023-0.090 kg a.i. ha-1 in a creeping bentgrass green trial and 0.057-0.339 kg a.i. ha-1 in two bluegrass/fescue fairway trials. Seasonal clipping yield reductions varied from 8 to 21 % in the green trial and from 0 to 25 % in the fairway trials; reductions were usually significant at two, but not at four weeks after application. Phytotoxic effects were observed at rates ≥ 0.113 kg a.i. ha-1 in one of the fairway trials, but TE resulted in less snow mould and faster green-up in 2008 in the other fairway trial and in the green trial. In a new green trial established 2008, weekly or biweekly applications of TE at rates 0.017-0.051 kg a.i. ha-1 reduced clippings by an average of 25 % and increased ball roll distance by an average of 6 %, however, differences among sprayed plots were not significant. In conclusion, we recommend that TE be approved for use on Scandinavian golf courses. Recommeded rates and application intervals are 0.023-0.046 kg a.i. ha-1 every 1-2 weeks on greens and 0.057-0.113 kg a.i. ha-1 every 2-3 weeks on fairways. The lower rates must always be used at the first application.
Forfattere
Bjørn Molteberg Trygve S. AamlidSammendrag
The first joint Scandinavian variety testing for lawn (mowing height 25 mm), sport turf (mowing height 35, regular wear) and fairway (mowing height 15 mm) was carried out from 2005 to 2008 (http://www.scanturf.org/). The Nordic counties were divided into one northern (mostly continental, NZ) and one southern (mostly coastal, SZ) climatic zone with four and three test sites, respectively. Besides control varieties, 28 and 24 varieties were tested in NZ and SZ, respectively. Based on these trials the following varieties are candidates to be added to Nordic turfgrass cultivar guide for at least one climatic zone and at least one are of use (lawn, fairway and/or sport turf; control varieties are indicated in parantheses): Festuca rubra ssp. commutata: Bargreen, Greensleeves, Legende Margret, Rosetti 1 and Wagner 1 (Center) Festuca rubra ssp. trichophylla: Seabreeze (Barcrown) Festuca rubra: ssp. rubra, SZ: Celianna, Shadow II (Pernille, Frigg) Poa pratensis: Kaitos, Mozart 1 and Ravel 1 (Conni, Limousine) Lolium perenne: Vesuvius (Bargold) Agrostis capillaris: Leirin (Bardot, Nor)
Sammendrag
The results from two field trials (Landvik and Apelsvoll) showed that the use of a proper combination of nitrogen rate and topdressing level is very important for thatch control. In coastal areas with ample rainfall, velvet bentgrass should be dusted with find sand every week or at least every other week, totalling around 10-14 mm per season. Nitrogen rate should be held at a level just to get an acceptable color. Weekly grooming, monthly verticutting and spiking twice a year are also needed to control thatch on velvet bentgrass greens, but heavy mechanical treatments should be avoided due to slow recuperative capacity of velvet bentgrass.
Forfattere
Hugh RileySammendrag
Sørger man for god agronomi i alle ledd og tilpasser gjødslingsmengde og tildeling, er mye lagt for en god kornavling med bedre N-effektivitet. Undersøkelser viser at N-effektiviteten øker ved høyere avlingsnivå, selv om det her gjødsles sterkere.
Forfattere
Arne HermansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Ragnhild NærstadSammendrag
Det er ikke registrert sammendrag