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.
2010
Forfattere
Trine EggenSammendrag
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Forfattere
Trine EggenSammendrag
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Forfattere
S Jacob Eivind Vangdal A Torricelli L Spinelli M Vanoli P Eccher Zerbini L M M Tisjkens E MadietaSammendrag
Absorption and scattering of laser light pulse passing through the fruit determine among others, the optical properties of the product. Efforts have been made in the recent past to utilize innovative techniques such as time-resolved reflectance spectroscopy (TRS) to study the quality aspects of different fruit such as nectarines. These optical properties have been well related to firmness, sugars, acids and other quality attributes. TRS measurements were performed on ‘Jubileum" plums at two different wavelengths: 670 nm and 758 nm. The fruit were harvested in Norway and brought to Italy under protected conditions. After sorting the fruit by size, TRS measurements were made and the fruit were randomized for different examinations of quality aspects. It was observed that the absorption coefficient (μa) increased for both wavelengths as ripening progressed towards the melting stage of the fruit. The μa values at 670 nm were higher than those at 758 nm. The higher rate in the μa was distinguishable from the third day onwards as the fruit ripened. Similarly, it was interesting to note that the internal colour measured after destructing the fruit related well with the TRS absorption coefficient (μa), i.e., a decrease in the CIE L* (towards darker region) and b* (towards blue) value along with an increase in a* (towards red) from third day of storage.
Forfattere
Klaus MittenzweiSammendrag
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Sammendrag
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Sammendrag
In Nordic countries organic farming started as bio-dynamic farms in the 1930s, and still in the 1970s only a small number of farms were organic. Since then the acreage of organic farming has increased and in 2007 Sweden had 222 268 ha (7.9%), Finland 147 557 ha (6.4 %), Denmark 147 482 ha (5.4%), Norway 43 033 ha (4.7%) and Iceland 4 684 ha (0.27%). In northern areas the short vegetation period combined with low temperatures reducing mineralisation causing nutritional deficit may restrict yields. As mineral fertilizers are prohibited in organic farming, plant nutrition and yield depend on proper microbial activity for nutrient cycling. Plant parasitic nematodes (PPN) reduce plant growth, while microbivorous nematodes (MBN) increase nutrient accessibility. Nitrogen fixating legumes, used to improve soil nitrogen levels, may increase densities of PPN to levels causing crop damage. Management of PPN in organic farming relies on knowledge of population dynamics, damaging thresholds and cultural methods like weed control, sanitation, mulching, crop rotation and resistant cultivars. Keeping PPN below damaging levels and supporting beneficial MBN to improve mineralisation would increase yields and improve quality of organics crops in northern areas. Management of MBN is less well understood, but may be of crucial importance for organic farming in northern areas.
Forfattere
Anne-Kristin LøesSammendrag
Young consumers are an important target group, because habits are established at young age. Hence, introducing children to organic food in public settings such as schools may be an efficient way to increase the consumption of organic food. In Norway, public procurement of food to youth is not well developed in comparison to many other European and Scandinavian countries. Many kindergartens provide some simple dishes for the children, and upper secondary schools usually have canteens where food items, sometimes also warm dishes, may be purchased. Canteens are becoming more common in other schools, especially on the lower secondary level. However, the usual lunch for most children in Norway in 2010 is a packed lunch (sandwiches) brought from home, consumed in the class room. School subscription schemes for milk were introduced around 1970, and for fruit around 1995. By June 2010, organic milk in 0.25 litre containers (“school milk”) is offered only in Mid-Norway, and organic fruit is hardly offered at all. Since 2007, fruit is served without payment in all schools with a lower secondary level (class 8-10 or 1-10). This effort was introduced as a first step to develop a free school meal in all public schools, but has not been further developed so far. [...]
Forfattere
Stine Rosenlund Hansen Thorkild Nielsen Niels Heine KristensenSammendrag
This report is a mapping of the activities within public procurement of organic food for youth in Denmark, with a special focus on school meals. In Denmark, it is voluntary whether local municipalities or schools arrange school meals or not. Until lately this was also the situation for meals in daycare institutions, but in 2008 a new legislation made it mandatory for the municipalities to offer a lunch meal in all daycare institutions, though this is still mainly financed by user charge. This change in legislation received much public attention, and has been heavily debated. School meals in Denmark were first introduced around 1900 as a social project for children in poverty, and have since been undergoing many changes. In the 1930‟s the warm meal was replaced by a cold lunch. During the 1970‟s free meals for malnourished children was gradually replaced by food stalls, selling milk, bread and fruit. Until the beginning of the 2000‟s such food stalls were widely spread, and in the 1980‟s and 1990‟s it was very common that pupils were responsible for running the stalls, receiving the profit for class excursions etc. In recent years a public and political debate about school meals has again aroused, mainly arguing that the food stalls is often offering a very unhealthy selection of food, and also pointing to the fact that many pupils bring unhealthy lunch from home or from nearby shops. Hence the argument that the public should help to ensure a healthy lunch for the pupils is again beginning to manifest, though there is no consensus on how this should be done and to what extent this should be funded by the public. Over time, more and more schools or municipalities choose to establish school meal systems, but these vary extensively in the way they are organized, what kind of food is served, and how they are financed. This report includes an overall mapping of the different ways of organizing school meals and their dissemination. Organic food has also been increasingly debated in relation to public procurement for children and youth, mainly in relation to meals in daycare institutions. Organic food is used in some school meal systems especially in municipalities inspired by Agenda 21, such as the municipalities in the Green Cities cooperation, but also other municipalities such as Esbjerg, Gladsaxe and Roskilde emphasize organic food. Whether the subject of organic food is discussed and implemented depends on the local values, goals, resources and politics. Hence there are municipalities and institutions with no organic food at all, while others have an organic share of more than 90 %. This is particularly in the municipalities situated in the Greater Copenhagen area. The municipalities in the Green cities cooperation have an average share of 59 % organic in all public procurement. The number is even higher when looking exclusively at public procurement for children and youth. These cases are briefly described in the report, along with a short mapping of other municipalities using organic food in meals for daycare institutions or schools. The report was produced in the iPOPY project, “innovative Public Organic food Procurement for Youth”. Similar reports have been produced for the other iPOPY countries; Norway, Finland and Italy.
Forfattere
Roberto Spigarolo Valerio Sarti Giulio GiorgiSammendrag
This report describes the political organisation and policies about public organic procurement in Italy, especially within school catering, and how organic products are utilized in this sector. The report is produced within the project “innovative Public Organic food Procurement for Youth”, iPOPY, and is a revised version of a preliminary report published in the same report series in 2008. Organic and otherwise typical and certified food is supported by several Italian regions by regulations and guidelines demanding that municipalities must prioritize such food in their calls for tenders. This has contributed to make Italy a leading public consumer of organic food, serving about 1 million dishes of school food per day with at least some organic ingredients. In total, about 40% of the food consumed in Italian schools is organic, and 36% from otherwise certified agriculture (local speciality, integrated or fair trade). On full length school days, all pupils are served a warm meal with two dishes, commonly also a desert. The average payment is 3.86 Euro. Future challenges for the Italian school meals with their high share of organic food are to reduce the high amounts of food waste, partly incurred by the current system of food serving where all pupils get equal portions, served at a table. Further, non-food costs are a challenge, as they constitute 70 % of the total food costs. Means to ensure that municipalities and caterers follow the regional guidelines are also required, as well as support for the municipalities to design efficient calls for tenders. The communication about organic food in schools, e.g. as a part of the education, should be strengthened to increase the pupil’s understanding of the benefits of this farming practice for the environment.
Sammendrag
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