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.
1999
Sammendrag
One of the major objects of the Agricultural Environmental Monitoring Program in Norway is to document the effect of different agricultural production systems and site-specific characteristics on erosion losses and losses of nutrients to surface waters. The program registers and reports on the extent of erosion and nutrient losses from 10 different agricultural dominated catchments (65 to 8 700 ha) under various agro-climatological conditions. One of the most striking results from the monitoring so far are the enormous variability between the catchments. Erosion varies from around 100 kg ha-1year-1 in three of the catchments to nearly 3 000 kg ha-1 arable land in one catchment. Highest erosion are measured in catchments with large autumn-ploughed area. Losses of phosphorus are highly connected to SS. It varies from around 0,4 kg ha-1 in catchments with low erosion to around 4 kg ha-1 in catchments with high erosion and high livestock density. In catchments with high livestock density manure is mainly (60-100 %) spread in spring. The losses of nitrogen also show large variability between catchments and are highly correlated to water discharge. Nitrogen losses vary from 20 kg ha-1 to nearly 90 kg ha-1, highest in an intensive horticultural catchment. Lowest losses of nitrogen are measured in two areas of cereal production, where silty soils are dominating and in two areas with pasture and low temperatures in summer. Nitrogen losses are generally high in catchments with high livestock density. Monitoring on catchment scale gives the effect of many different agricultural practices and site-specific characteristics in one point. Variations in erosion and nutrient losses are a sum of positive and negative effects within the catchment area. Nevertheless the results suggest that erosion and nutrient losses be related to a set of agricultural practices and site specific characteristics.
Forfattere
Geir Wæhler GustavsenSammendrag
Det er ikke registrert sammendrag
Forfattere
Gunnar Ogner Torild Wickstrøm Gabriele Remedios Svein Gjelsvik Guro Randem Hensel Jan Erik Jacobsen Monica Fongen Espen Skretting Britt SørlieSammendrag
This article describes in brief the chemical analytical program at The Norwegian Forest Research Institute in 2000. Due to a continuous effort to develop and to improve analytical methods to meet the demands of forest research in Norway, the four earlier summaries of our methods (Ogner et al. 1975, 1977, 1984, 1991) are now outdated. This article replaces the previous ones and describes only those procedures currently being used for the analysis of water, plant and soil samples
Forfattere
A. TigerstedtSammendrag
Det er ikke registrert sammendrag
Forfattere
Birger VenneslandSammendrag
Det er ikke registrert sammendrag
Sammendrag
The study examines the economics of combined milk and meat production as an alternative to the current specialised milk production on Norwegian goat. The reasons for the study are 1) to increase goat farm incomes,2) to improve the annual distribution pattern of goat milk and 3) to reduce negative publicity of farmers killing surplus goat kids just after birth. The most promising management practice would be to change the time of kidding from February to late April or May, combined with suckling the kids during the daytime until August. The kids are to be slaughtered in August in order to utilise the summer grazing period and market the kids the month before start of the lamb slaughter season. While the kids are being suckled, the does are milked once per day and after weaning the does are milked twice a day, thereby increasing milk deliveries during autumn and winter when milk prices are higher. A discussion of how the natural conditions and the Norwegian agricultural policy contribute to the results increases the value of the study.
Forfattere
H.J Rosenfeld Ragnar T. Samuelsen P LeaSammendrag
Results of carrot cv Panther grown in growth chambers in the north and the south of Norway at mean diurnal temperature of 12 and 18 oC combined with diurnal temperature amplitudes of 0, 6 or 12 oC, regarding physical measurements, chemical composition and sensory attributes, are given.
Forfattere
Espen Haugland Lars Olav BrandsæterSammendrag
Det er ikke registrert sammendrag
Forfattere
Kari Anne Sølvernes Øystein Johnsen Lars Sandved Dalen Gunnar OgnerSammendrag
Det er ikke registrert sammendrag
Forfattere
Kari Anne Sølvernes Øystein Johnsen Gunnar OgnerSammendrag
The impact of elevated CO2 on height increment, phenology, biomass, and concentration of carbohydrates, pigments and elements in clones of Norway spruce (Picea abies (L.) Karst ) were studied in a three year open-top chamber experiment. The CO2-effect on height increment, biomass, and concentration elements of Silver birch (Betula pendula Roth.) was also recorded. The CO2 concentrations were ambient (380 µmol mol-1), approximately 500 and 700 µmol mol-1 CO2 in the chambers. Additionally, an outside control plot was present. Norway spruce were grown in intact profiles of forest soil and in fertilised peat. Silver birch was grown in forest soil only. Phenology and leader shoot extension were recorded regularly. Element concentrations of leaves and needles were analysed at the end of each growth season. At the end of the experiment, carbohydrate and pigment concentrations were also analysed. The impact of elevated CO2 on Silver birch and Norway spruce was small in this experiment. A marginal increase in biomass were recorded in Silver birch and in Norway spruce grown in fertilised peat. Phenology, concentration of elements, C:N ratio, concentrations of carbohydrates and pigments were almost unaffected by elevated CO2. The largest effect on growth and chemical composition were caused by chambers versus outside control plots and difference in nutrient supply (Norway spruce). Significant higher concentration of Al, Na and Fe were recorded in both species in the outside control plots compare to the plants inside the chambers. The increased concentration of these elements could be caused by a higher dust exposure outside the chambers than inside