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.
2009
Forfattere
Jørn-Frode NordbakkenSammendrag
Det er ikke registrert sammendrag
Forfattere
Jørn-Frode NordbakkenSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Organiske gjødselslag som kjøttbeinmel, biorest av matavfall, matavfallskompost, hydrolysert lakseprotein og blautgjødsel har forskjellig virkning som N- og P-gjødsel, og varierende risiko for utvasking. Når mesteparten av nitrogenet er i organisk form i utgangspunktet, er det liten risiko for at det blir store konsentrasjoner av utvaskbart nitrogen. Det er påvist økt utvasking av fosfor ved bruk av biorest og husdyrgjødsel i forhold til bruk av Fullgjødsel®.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
One of the major concerns regarding use of velvet bentgrass in Scandinavia is whether current cultivars are sufficiently tolerant to frost. In 2008-09 the four velvet bentgrass (VB, Agrostis canina L.) cultivars Avalon, Greenwich, Legendary, and Villa, and the creeping bentgrass (CB, Agrostis stolonifera L.) cultivar Penn A-4 (control) were established from seed in 7.5x10x10 cm pots filled with a USGA-spec. sand containing 0.5% (w/w) organic matter. The following four treatments representing different phases of cold acclimation were compared: (i) nonacclimated (NA) plants maintained at 18 °C/12 °C (day/night) and 16 h photoperiod (150 μmol/m/s); (ii) plants acclimated at 2 °C and 16 h photoperiod (250 μmol/m/s) for 2 wk (A2); (iii) plants acclimated as ii plus 2 wk of sub-zero acclimation in darkness at -2 °C (A2+SZA2); and (iv) naturally acclimated plants under outdoor (field) conditions in November -December (FA). Freezing tolerance was assessed visually as percent of pot surface covered with healthy turf after 26 days of recovery in the greenhouse. To examine the relationship between physiological changes under cold acclimation and freezing tolerance, crowns of VB and CB were harvested for carbohydrate (CHO) analysis after each hardening treatment. Results showed that FA plants survived all freezing treatments (plant coverage more than 90 %). A2+SZA2 plants had better survival after freezing to -9 °C, -12 °C and -15 °C as compared with A2 plants. Differences in freezing tolerance between VB and CB were not significant. NA plants survived none of freezing temperatures. The predominant CHO in VB and CB crowns were sucrose and fructans. Compared with NA plants, A2 plants had significantly higher concentrations of fructose, sucrose and fructan. Exposure to -2 ºC in darkness (A2+SZA2) had no further effect on these concentrations. Natural hardening (FA) resulted in total carbohydrate and fructan concentrations significantly lower than for plants exposed to artificial acclimation.
Sammendrag
Pink snow mould brings a lot of injury on golf courses in cool and cold regions all over the world. There is unnecessary use of fungicides to date because the injury or even sporadic epidemics caused by the disease are difficult to predict. Improved knowledge about biology, ecology and genetics of Microdochium nivale furthers the development of alternative methods for IPM of pink snow mould.
Forfattere
Trygve S. Aamlid Trond Olav Pettersen Tatsiana Espevig Siv Lene Gangenes Skar Agnar KvalbeinSammendrag
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Forfattere
Trygve S. Aamlid Tatsiana Espevig Trond Olav Pettersen Siv Lene Gangenes Skar Agnar KvalbeinSammendrag
Soil water repellency (SWR) is a common phenomenon on sand-based golf greens. Soils are considered severely water repellent if water droplets remain on the surface of undisturbed, air-dried soil samples for more than 600 seconds before penetrating. The objective of this research was to evaluate the potential of a surfactant to overcome SWR and restore turfgrass quality on a green with severe drought symptoms. The surfactant Aqueduct® was applied at a rate of 25 L ha-1 at weekly intervals from 4 June through 25 June 2008, either alone or after aeration with solid tines to 5 cm depth before each application. The experiment was irrigated uniformly corresponding to 1.65 times pan evaporation values from 4 June till 12 June, after which irrigation was not necessary due to natural rainfall. Conspicuous and statistically significant improvements in turfgrass quality occurred 10-12 days after the first application of surfactant, and the difference from untreated control plots continued to increase for about two and a half months after the completion of treatments. The improvement was accompanied by a significant increase in the SWC of the 0-20 cm soil layer and a deeper root system. The difference in WDPT between treated and untreated plots was significant at 1 cm, but not at 2, 3, 5 or 10 cm soil depths which were always far more water repellent than the thatch layer. Repeated aeration had no significant effect on turfgrass quality, and there was no significant interaction between surfactant and aeration treatments.
Sammendrag
Det er ikke registrert sammendrag