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.
2019
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Sammendrag
Utlekking og overflateavrenning etter høstsprøyting av de kjemiske soppmidlene protiokonazol + trifloksystrobin (Delaro® SC 325), boskalid + pyraklostrobin (Signum), fludioksonil (Medallion TL) og deres metabolitter ble studert gjennom vintrene 2016/17 og 2017/18. Krypkveinsgreener med 5% helling var etablert ved såing eller med ferdiggras (25 mm filt) på USGA-sand tilsatt hage/park-kompost eller hvitmosetorv (begge 1.0-1.2 % glødetap). Av den total nedbøren i forsøksperioden ble 3 % gjenfunnet som overflateavrenning og 91% som grøftevann gjennom den første forsøksvinteren. Vinteren etter endret dette seg til 33/55 % på grunn av større temperaturvekslinger, mer tele i jorda, mer nedbør og isdekke. Konsentrasjonen av soppmidler og metabolitter i grøftevannet var store sett innafor miljøfarlighets (MF) - grensene for vannlevende organismer, men i overflatevann ble MF-grensene overskredet inntil 1000 ganger for flere av de undersøkte stoffene. Det var små forskjeller i utlekking eller overflateavrenning mellom rotsoner med torv eller kompost, men bruk av ferdigplen reduserte utlekkinga sammenlikna med såing. Resultatene blir drøfta med vekt på praktiske tiltak for å redusere miljøbelastninga ved sprøyting mot overvintringssopp.
Forfattere
Ingerd Skow Hofgaard Heidi Udnes Aamot Morten Lillemo Guro Brodal Erik Lysøe Marit Almvik Anne-Grete Roer Hjelkrem Mauritz Åssveen Aina Lundon Russenes Einar Strand Åsmund Bjørnstad Helge Skinnes Selamawit Tekle Espen Sannes Sørensen Trond Buraas Alf Ceplitis Birgitte Henriksen Bernd Rodemann Simon G. EdwardsSammendrag
Occasionally, high mycotoxin levels are observed in Norwegian oat grain lots. The development of moderate resistant oat cultivars is therefore highly valued in order to increase the share of high quality grain into the food and feed industry. The Norwegian SafeOats project (2016-2020) aims to develop resistance screening methods to facilitate the phase-out of Fusarium-susceptible oat germplasm. Furthermore, SafeOats will give new insight into the biology of F. langsethiae and HT2+T2 accumulation in oats. The relative ranking of oat varieties according to F. graminearum/DON versus F. langsethiae/HT2+T2 content has been explored in naturally infested as well as in inoculated field trials. Routine testing of the resistance to F. graminearum in oat cultivars and breeding lines has been conducted in Norway since 2007. We are currently working on ways to scale up the inoculum production and fine tune the methodology of F. langsethiae inoculation of field trials to be routinely applied in breeding programs. Through greenhouse studies, we have analysed the content of Fusarium DNA and mycotoxins in grains of selected oat varieties inoculated at different development stages. Furthermore, we are studying the transcriptome during F. langsethiae and F. graminearum infestation of oats. The project also focus on the occurrence of F. langsethiae in oat seeds and possible influence of the fungus on seedling development in a selection of oat varieties. On average, the fungus was observed on 5% of the kernels in 168 seed lots tested during 2016-2018. No indication of transmission of F. langsethiae from germinating seed to seedlings was found in a study with germination of naturally infected seeds. So far, the studies have shown that the ranking of oat varieties according to HT2+T2 content in non-inoculated field trials resembles the ranking observed in inoculated field trials. The ranking of oat varieties according to DON content is similar in non-inoculated and F. graminearum inoculated field trials. However, the ranking of oat varieties according to DON content does not resemble the ranking for HT2+T2. The results from SafeOats will benefit consumers nationally and internationally by providing tools to increase the share of high quality grain into the food and feed industry. The project is financed by The Foundation for Research Levy on Agricultural Products/Agricultural Agreement Research Fund/Research Council of Norway with support from the industry partners Graminor, Lantmännen, Felleskjøpet Agri, Felleskjøpet Rogaland & Agder, Fiskå Mølle Moss, Norgesmøllene, Strand Unikorn/Norgesfôr and Kimen Seed Laboratory.
2018
Sammendrag
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Sammendrag
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Forfattere
Roger Holten Frederik Bøe Marit Almvik Marianne Stenrød Mats Larsbo Nicholas Jarvis Ole Martin EkloSammendrag
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Forfattere
Roger Holten Frederik Bøe Marit Almvik Sheela Katuwal Marianne Stenrød Mats Larsbo Nicholas Jarvis Ole Martin EkloSammendrag
Limited knowledge and experimental data exist on pesticide leaching through partially frozen soil. The objective of this study was to better understand the complex processes of freezing and thawing and the effects these processes have on water flow and pesticide transport through soil. To achieve this we conducted a soil column irrigation experiment to quantify the transport of a non-reactive tracer and the herbicide MCPA in partially frozen soil. In total 40 intact topsoil and subsoil columns from two agricultural fields with contrasting soil types (silt and loam) in South-East Norway were used in this experiment. MCPA and bromide were applied on top of all columns. Half the columns were then frozen at −3 °C while the other half of the columns were stored at +4 °C. Columns were then subjected to repeated irrigation events at a rate of 5 mm artificial rainwater for 5 h at each event. Each irrigation was followed by 14-day periods of freezing or refrigeration. Percolate was collected and analysed for MCPA and bromide. The results show that nearly 100% more MCPA leached from frozen than unfrozen topsoil columns of Hov silt and Kroer loam soils. Leaching patterns of bromide and MCPA were very similar in frozen columns with high concentrations and clear peaks early in the irrigation process, and with lower concentrations leaching at later stages. Hardly any MCPA leached from unfrozen topsoil columns (0.4–0.5% of applied amount) and concentrations were very low. Bromide showed a different flow pattern indicating a more uniform advective-dispersive transport process in the unfrozen columns with higher con- centrations leaching but without clear concentration peaks. This study documents that pesticides can be pre- ferentially transported through soil macropores at relatively high concentrations in partially frozen soil. These findings indicate, that monitoring programs should include sampling during snow melt or early spring in areas were soil frost is common as this period could imply exposure peaks in groundwater or surface water.