Överföring av radiocesium till potatis vid olika nedfallstidpunkter
Agricultural land could be polluted by radioactive substances after a fallout. We would then need information about the level of contamination to decide whether the crops could be utilized as food under these circumstances. In an experiment carried out during the 1990ies the retention of 134Cs in po...
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| Format: | Otro |
| Language: | Swedish Swedish |
| Published: |
2008
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| Subjects: | |
| Online Access: | https://stud.epsilon.slu.se/11779/ |
| _version_ | 1855571937626947584 |
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| author | Stenmark, Marielle |
| author_browse | Stenmark, Marielle |
| author_facet | Stenmark, Marielle |
| author_sort | Stenmark, Marielle |
| collection | Epsilon Archive for Student Projects |
| description | Agricultural land could be polluted by radioactive substances after a fallout. We would then need information about the level of contamination to decide whether the crops could be utilized as food under these circumstances. In an experiment carried out during the 1990ies the retention of 134Cs in potato haulm and the transfer to the tubers were studied. The experiment was carried out during three consecutive years. The plants were cultivated in pots under field conditions and the artificial deposition was sprayed directly onto the potato haulm at different times during the growing season. The results showed that the time of fallout and the developmental stage of the crop controlled the 134Cs content in the harvest-mature potato tubers. The highest content was detected in the case of a fallout in the middle of the growing season. In the case of an early fallout, the change in 134Cs content during the growing season decreased with time. After a late fallout the content tended to increase with time which was supposedly due to an active transport during the later stages of crop development. Assuming a fallout corresponding to 10 kBq the 134Cs content in the harvest-mature potato tubers would be above the permitted threshold value after a radioactive fallout taking place in the middle of the growing season. Actions to decrease the Cs content below the threshold value may include potassium fertilisation, an early harvest or cutting of the potato haulm. |
| format | Otro |
| id | RepoSLU11779 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish swe |
| publishDate | 2008 |
| publishDateSort | 2008 |
| record_format | eprints |
| spelling | RepoSLU117792017-10-17T10:31:32Z https://stud.epsilon.slu.se/11779/ Överföring av radiocesium till potatis vid olika nedfallstidpunkter Stenmark, Marielle Dept. of Soil Sciences Soil chemistry and physics Agricultural land could be polluted by radioactive substances after a fallout. We would then need information about the level of contamination to decide whether the crops could be utilized as food under these circumstances. In an experiment carried out during the 1990ies the retention of 134Cs in potato haulm and the transfer to the tubers were studied. The experiment was carried out during three consecutive years. The plants were cultivated in pots under field conditions and the artificial deposition was sprayed directly onto the potato haulm at different times during the growing season. The results showed that the time of fallout and the developmental stage of the crop controlled the 134Cs content in the harvest-mature potato tubers. The highest content was detected in the case of a fallout in the middle of the growing season. In the case of an early fallout, the change in 134Cs content during the growing season decreased with time. After a late fallout the content tended to increase with time which was supposedly due to an active transport during the later stages of crop development. Assuming a fallout corresponding to 10 kBq the 134Cs content in the harvest-mature potato tubers would be above the permitted threshold value after a radioactive fallout taking place in the middle of the growing season. Actions to decrease the Cs content below the threshold value may include potassium fertilisation, an early harvest or cutting of the potato haulm. Vid utsläpp av radioaktiva ämnen förorenas jordbruksmark. För att veta om grödorna sedan kan nyttjas som livsmedel måste vi veta hur stora halterna blir. I detta försök studerades uppfångning av 134Cs vid direktdeponering på potatisblast och överföring vidare till knölarna. Experimentet utfördes under tre på varandra följande år. Plantorna odlades i försökskärl under fältmässiga förhållanden och den artificiella depositionen sprayades direkt på blasten vid olika tidpunkter under odlingssäsongen. Resultaten visar att tidpunkten för nedfall och grödans utvecklingsstadium styr 134Cs-halten i den skördemogna potatisen. Som högst blev halten vid ett nedfall i mitten av odlingssäsongen. Förändringen över säsongen i 134Cs-halt blir vid tidiga nedfall lägre med tiden. Vid sena nedfall tenderade halten däremot att öka med tiden vilket beror av att plantan har en aktiv näringstransport vid senare utvecklingsstadier. Vid en nedfallsnivå på 10 kBq ligger halten i den skördemogna potatisen över gränsvärdet om nedfallet sker i mitten av säsongen. Åtgärder för att komma under gränsvärdet kan vara att kaliumgödsla, tidigarelägga skörden eller kapa av blasten. 2008-09-30 Other NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/11779/1/stenmark_m_171017.pdf Stenmark, Marielle, 2008. Överföring av radiocesium till potatis vid olika nedfallstidpunkter. UNSPECIFIED, Uppsala. Uppsala: (NL, NJ) > Dept. of Soil Sciences <https://stud.epsilon.slu.se/view/divisions/4023.html> urn:nbn:se:slu:epsilon-s-7910 swe |
| spellingShingle | Dept. of Soil Sciences Soil chemistry and physics Stenmark, Marielle Överföring av radiocesium till potatis vid olika nedfallstidpunkter |
| title | Överföring av radiocesium till potatis vid olika nedfallstidpunkter |
| title_full | Överföring av radiocesium till potatis vid olika nedfallstidpunkter |
| title_fullStr | Överföring av radiocesium till potatis vid olika nedfallstidpunkter |
| title_full_unstemmed | Överföring av radiocesium till potatis vid olika nedfallstidpunkter |
| title_short | Överföring av radiocesium till potatis vid olika nedfallstidpunkter |
| title_sort | överföring av radiocesium till potatis vid olika nedfallstidpunkter |
| topic | Dept. of Soil Sciences Soil chemistry and physics |
| url | https://stud.epsilon.slu.se/11779/ https://stud.epsilon.slu.se/11779/ |