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.
2007
Forfattere
Tor MykingSammendrag
Det er ikke registrert sammendrag
Forfattere
Sølvi SvendsenSammendrag
Det er ikke registrert sammendrag
Forfattere
Maria HerreroSammendrag
Symptomer på P.ramorum på diverse vertplanter.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Trond MæhlumSammendrag
Det er ikke registrert sammendrag
Forfattere
Ann NorderhaugSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Hugh RileySammendrag
Factorial combinations of N, P and K fertilizer have been compared with the use of farmyard manure at Møystad since 1922 in a seven-year crop rotation (3 ley, oat, potato, wheat, barley). Until 1982, low inputs of N fertilizer (22 kg ha-1) were used. In 1983, they were brought into line with current farming practice. This paper presents results of three subsequent rotations. Yields without any fertilizer were on average 48% of those with 100 kg N ha-1 in compound fertilizer, whilst those with 20, 40 and 60 Mg ha-1 farmyard manure were 81, 87 and 90%, respectively. Yields with other combinations of N, P and K declined in the order NP, NK, N, PK and K. When NPK fertilizer was used, apparent recoveries of applied fertilizer were close to 50% for N and K, and around 40% for P. Much lower values were found for nutrients applied singly. Balance between N supply and removal was indicated at rates of about 60 kg N fertilizer ha-1 in potatoes, 75 kg ha-1 in cereals and 90 kg ha-1 in leys. A surplus of P was found in all crops at all N levels, and of K in cereals and potatoes. In leys, K balance was achieved with an N supply of 90 kg N ha-1. Nutrient balance was indicated at a little below 20 Mg ha-1 yr-1 farmyard manure. Larger manure applications gave large nutrient surpluses, particularly of N. Soil reaction remained close to neutral with the use of calcium nitrate and manure, but declined with the use of ammonium nitrate. Manure use gave the highest amounts of available P, K and Mg in soil. Similar increases in total inorganic P were found with manure use as with fertilizer use, but amounts of organic P and total K were little affected.
Forfattere
Ievina Sturite Trond Maukon Henriksen Tor Arvid BrelandSammendrag
Conclusions The short lifespan and poor over-wintering of leaves showed their potential importance as a nitrogen source in the soil-plant ecosystem but also their potential contribution to the risk of off-season N losses.
Sammendrag
In summer, more than 2.1 million sheep and lamb graze in Norwegian outfield and mountain ranges. Up to the 1990ties, the losses of sheep and lambs were stable, with an annual loss of approx. 3,6 %, mainly due to accidents, illnesses and carnivores. The numbers of large carnivores (wolf, bear, lynx and wolverine) and the golden eagle has increased the last 15-20 years, due to international agreements and a political will in Norway to have sustainable populations of these species. At the same time, the annual losses of sheep and lambs has increased to a peak last year (2006) of 6,8 %. Reindeer has had the same development regarding increased depredation. The paper deals with present and future R&D in causes of loss and preventive measures, and information and advice to farmers and authorities on methods to prevent depredation. The main goal is to reduce the losses of sheep and reindeer, and at the same time reach the government"s goal on sustainable population of carnivores. In 2006, Bioforsk launched a website which summarize the knowledge of causes of losses and preventive methods on depredation, based on an agricultural approach and Biofosk"s competence in animal welfare, grazing and livestock management.