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.
2003
Sammendrag
At present there are nearly 20 000 milk producers in Norway, and approximately 10 per cent of them are members of the Norwegian Dairy Financial Recording (NDFR). The NDFR is an important basis for production and financial advice given by the dairies. There is a great interest among milk producers and advisors in comparing results from different farms to find out why some are doing well and some are doing not so well, and to learn from those doing well. Gross margin (GM) per litre of milk produced is the traditional indicator for efficiency. This data, as other data on milk production, indicate that there is a wide variation in gross margin per litre of milk between farms with seemingly similar conditions for producing milk. This is interpreted as a potential for improving the efficiency of many producers. However, for many reasons gross margin per litre of milk is not an ideal indicator. A new version of the NDFR contains more information, for instance information on fixed costs of roughages produced on the farm. It is hoped that the new version of the NDFR makes it a better tool for improving the profitability of milk production. In an ongoing project we try to use the NDFR to analyse who are doing well and why. We use a combination of Data Envelopment Analysis (DEA) and statistical analysis. For each farm we produce an efficiency index, and then we apply statistical methods to find factors that can explain the index. So far we have only very preliminary results. Management factors are important, but the NDFR data-base have very little information on management factors. It is planned to collect such data for a sample of farmers and include that in the study at a later stage.
Forfattere
Bernt Olav HoelSammendrag
Leaves of winter wheat were measured with a Hydro N-Tester (HNT), a portable chlorophyll meter, to obtain a relative estimate of leaf chlorophyll content, which gives an indication of plant N-status. The aim was to find if there were differences in HNT values between winter wheat cultivars investigated, and to assess whether these values could be used for prediction of grain protein content (GPC).
Sammendrag
Gjennom prosjektet "Kartlegging og bekjemping av skadegjerarar i klyppegrønt og juletreproduksjonen" har det vorte klart at mange ulike soppsjukdomar kan gjera stor skade under oppal og produksjon av juletre.
Sammendrag
Granrust angrip nye, mjuke nåler. Ved sterke angrep kan heile årsskota verta gule. Denne rustsoppen kan vera problematisk i juletrefelt. Angrepa aukar som regel til høgare over havet og lenger nord ein kjem.
Forfattere
Harald Kvaalen Ola Gram Dæhlen Ulrika EgertsdotterSammendrag
Det er ikke registrert sammendrag
Forfattere
Erland Kjesbu Håvard MjeldeSammendrag
Det er ikke registrert sammendrag
Forfattere
Tor Håkon Sivertsen Trond RafossSammendrag
A small fruit growing area of southern Norway is chosen as a pilot area. This area contains four automated meteorological stations owned by The Norwegian Crop Research Institute. The measurements made at the stations are hourly recordings of precipitation, air temperature, leaf wetness and relative humidity of the air, plus some additional measurements at some stations. The area has a relatively smooth topography with hills and no mountains. The highest point is located about 300 m above the sea level, and the lowest 15 m above sea level. The remote sensing research group at The Norwegian Meteorological Institute is providing the hourly radar measurements of precipitation, from two different weather radars. All the precipitation data used is documented according to a system developed by The Norwegian Crop Research Institute, and for the growing season ahead data will be distributed to the local private extension service, but this year there will be no development of biological models serving the fruit growers (apple scab etc) using all the additional relevant data. The outcome of the use of the operational use of the data in the coming growing season, will be comparing the data from the different sources, and looking closer at the possible significance of the use of a documentation system for the data from different sources. Finally the quality of the data is discussed, as well as the possible steps to be taken for future and extended use of such data.
Forfattere
Guillaume Besnard Virginie Acheré Sylvain Jeandroz Øystein Johnsen Tore Skrøppa Patricia Faivre Rampant Jean-Michel FavreSammendrag
Det er ikke registrert sammendrag
Forfattere
Christian Uhlig Alexander Zink Timo KumpulaSammendrag
Mammalian herbivores generally influence their pastures significantly. However, detectable changes in pastures due to grazing activities are rather difficult to classify and their practical usability for herders are therefore generally low.The aim of this research was to create a general concept for field observations to estimate the state of reindeer pastures. Furthermore, the object was to compare obtained results with remote sensing data.
Forfattere
Åsmund Asdal T.A. BrelandSammendrag
Det er ikke registrert sammendrag