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
Tor Håkon Sivertsen Josef Eitzinger Sabina Thaler Simone Orlandini Pavol Nejedlik Valentin Kazandjiev Dragutin MihailovicSammendrag
During the past decades, many new software tools were developed to be used for agricultural research as well as for decision making. For example, crop and whole farm system modelling, pest and disease warning models/algorithms, models for irrigation scheduling or agroclimatic indices can help farmers significantly in decision-making for crop management options and related farm technologies. The aim of Working group 1 of COST734 was a review and assessment of agroclimatic indices and simulation models relevant for various European agricultural activities. The key results, based on a survey by questionnaires among the COST734 participating countries (see: http://www.cost734.eu/) and a literature survey, are presented in this study. It includes an overview of most used agrometeorological or agroclimatic indices and process oriented crop models for operational as well as scientific applications, an analysis of the limitations for applications and an overview of spatial applications in combination with GIS and remote sensing in Europe. The COST734 survey showed for example, that research activities regarding the development of agroclimatic indices in Europe are focused on indizes on drought, phenology, frost and heat stress. Process oriented crop models are mainly applied for wheat and maize, which is related to their importance in European crop production. In many cases there are still limitations of crop model applications in Europe, which often are related to the availability of input data. Spatial crop model applications including a combination with remote sensing data are still rare. There are a number of different models and indices in use, varying by regions and countries. From the survey it can be concluded that there is a need of standardisation and harmonization of applications of agroclimatic indices as well as crop models in Europe in order to allow inter-comparison of the results and to improve the interpretation of results.
Forfattere
Astrid JohansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Astrid JohansenSammendrag
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Forfattere
Oddbjørn Kval-Engstad Astrid Sandvik Finn Avdem Øystein Havrevoll Astrid JohansenSammendrag
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Sammendrag
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Forfattere
Astrid JohansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Astrid JohansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Oddbjørn Kval-Engstad Astrid Sandvik Finn Avdem Øystein Havrevoll Astrid JohansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Rolf Tore Djønne Gunnhild JåstadSammendrag
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Forfattere
Ricardo Holgado Kari Anne Oppen Christer MagnussonSammendrag
Soil samples from a growth depression in potato (Solanum tuberosum) cv. Saturna field in Grue, eastern Norway, yielded large numbers of root lesion nematodes, Pratylenchus penetrans. Yield of potato was reduced by 50% in the affected area of the field. Transect-sampling showed plant growth to be negatively correlated with densities of P. penetrans and suggested a damage threshold of potato to the nematode of 100 specimens per 250 g of soil. Common scab (Streptomyces scabies) occurred frequently in the affected area. Pratylenchus penetrans was present in roots, underground stems, stolons and tubers. In tubers, nematodes were detected inside cross-lesions typical of common scab, and occurred also in the outermost 0.5 mm tissue associated with such lesions. On potato cv. Saturna grown in a green-house, P. penetrans alone induced tuber lesions similar to those of common scab. Also, the combined inoculation of the bacterium and the nematode seemed to enhance symptom expression. Pratylenchus penetrans survives storage of potatoes, from which new infections may develop. Hence, potato tubers do appear to be an important means for the spread of P. penetrans to new areas.