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FFL-JA-Forskningsmidlene for jordbruk og matindustri

ANTIGRO - New strategies for sprout control in long time storage of processing potatoes

Alternative title: ANTIGRO - Nye strategier for spirefri langtidslagring av friteringspoteter

Awarded: NOK 2.8 mill.

In order to achieve the desired frying colour and low acrylamide levels, potatoes for frying must be stored at a slightly higher storage temperature than is otherwise optimal. It is therefore necessary to put in place measures to prevent sprouting in the latter part of the storage season. This project will focus on development of new, robust and sustainable strategies for long-time storage of frying potatoes, as an alternative to the previously used sprout suppressant which is no longer allowed. The strategies will be adapted to the various types of stores and potato qualities used in Norway. The project will include making a knowledge base on the specifications of the stores which may be relevant for long term storage of processing potatoes. The project will also include testing of alternative sprout control strategies during long-time storage. We will investigate different combinations of chemicals, doses and strategies, different stores and different potato materials (cultivars and physiological qualities). We will perform testing both in large and small scale. The levels of CO2 in storage air will be monitored in some stores, and the quality of the products will be controlled before, during and after storage. Residual levels of chlorpropham will be analysed in selected stores throughout the project period, in order to secure a production within acceptable limits. Alternative strategies with low or no use of sprout suppressants is the ultimate goal, and the possibilities for this will be investigated through testing of new cultivars/breeding lines which accumulates less sugar during cold storage. In the storage season 2020-21, large-scale testing has been carried out with various treatment strategies with sprout supression. Sprout suppression was carried out in 6 different commercial stores with different types of storage system with the chemicals 1.4-sight or 1.4-sight in combination with Biox-M (green mint oil). The varieties Innovator, Lady Claire, Lady Britta and Oleva were included in the experiments. All stores were monitored with temperature, humidity and CO2 logging. Samples were also taken for residue analysis from tubers in the stores and they were continuously followed up with photos during the storage season. After storage, the potatoes were quality assessed. There were no differences between different treatment strategies in terms of weight loss, dry matter, silver scurf and frying color. All treatment strategies had and good effect of the sprouts. It may be possible to reduce the dose, as the agent was detected in the tubers several weeks after the last treatment. For Biox-M, it is important to find the right time for treatment. This works best when there are sprouts that have already grown. Large-scale testing continues in the 2021-22 season. Residue analysis for chlorprofam has been carried out in tubers from 10 stores that were previously treated with this sprout suppressant, which is no longer allowed. There were residue values between 0 and 0.1 mg / kg in the 10 tested stores, a result that is far below the limit value of 0.4 mg / kg. No additional measures are taken immediately to bring the residual values down. Residue analysis will be performed again in the 2021-22 season. Controlled storage trials have been initiated in small-scale stores with testing of five different treatment strategies. Here, different doses of 1.4-Sight and Biox-M will be tested. The strategies are tested on five different varieties of French fries (Peik, Innovator, Fontane, Oleva and G07-1655) and two varieties of crisps (Lady Claire and Kiebitz). In addition, materials with different degrees of maturity are also tested. All potato material for the experiments is grown at NIBIO Apelsvoll. Low temperature during storage will delay sprouting, but for frying, varieties that accumulate little sugar during cold storage are required. The project investigates whether storage at low temperatures (4 ?C and 6 ?C) can to a certain extent replace treatment with sprout suppressants. This is done in three varieties intended for French fries (Peik, Fontane and G07-1655) and three varieties intended for crisps (L. Claire, Kiebitz and P03-19-21). The controlled storage trials were started in September 2021 and are ongoing as planned.

Potetindustribedriftene Findus Norge, Maarud, Hoff og Orkla/Kims har i dag tilnærmet helårsproduksjon av friterte potetprodukter (chips/pommes frites) med basis i norske poteter. Friteringspoteter kan av kvalitetshensyn (farge, akrylamid) ikke lagres kaldt. Ved helårs produksjon, både i Norge og andre land, er det derfor helt nødvendig å bruke midler som hindrer potetene i å spire på lager på etterjulsvinteren. Norsk og Europeisk friteringsbransje står nå i en svært krevende situasjon, etter et forbud mot det eneste middelet som til nå er brukt i Norge. Alternativer finnes, men midlene er kostbare, og krever utprøving i forhold til våre særegne norske råvarer (sorter, fysiologisk kvalitet) og lagringsfasiliteter. Utvikling av nye, kvalitetsmessig robuste strategier for å redusere groing er nødvendig for at langtidslagringen kan gjennomføres med tilstrekkelig forutsigbarhet og uten for stor risiko. Behandlingen må være økonomisk bærekraftig og være tilpasset de sorter, råvarekvaliteter og lagerforhold som er vanlig her i landet. Målet med prosjektet er en nasjonal satsing for å sikre grunnlaget for norsk dyrking og videreforedling av de ca 30.000 tonn poteter som bedriftene i dag behandler med spirehemmer. Uten tilstrekkelig tilpassing kan alternativet bli redusert norsk potetproduksjon og økt import av antigrobehandlet potet, og redusert driftssesong og/eller lønnsomhet for bedriftene. Prosjektet skal, i samarbeid med internasjonal ekspertise, utvikle nye og robuste behandlingsstrategier med best mulig økonomisk og kvalitetsmessig resultat etter langtidslagring, tilpasset de lagertypene som brukes i Norge. Det skal også undersøkes en hypotese om at mindre fysiologisk modne poteter (som i Norge) krever mindre bruk av antigromiddel enn mer modne potetene lenger sør i Europa. Videre skal det fokuseres på reduksjon av mengde uønskede reststoffer av antigromidler i potet, og på alternative strategier for langtidslagring uten, eller med svært lave doser av antigromidler

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FFL-JA-Forskningsmidlene for jordbruk og matindustri