Kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd
Couch grass (Elymus repens (L.) Gould) is a severe weed in Sweden, and since both the use of herbicides and cultivation should be decreased, it will become increasingly problematic to control couch. The present work is meant to, by literature studies and an experiment, give some answers to the quest...
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| Formato: | Otro |
| Lenguaje: | sueco sueco |
| Publicado: |
2007
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| Materias: | |
| Acceso en línea: | https://stud.epsilon.slu.se/11958/ |
| _version_ | 1855571973108662272 |
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| author | Modig, Per |
| author_browse | Modig, Per |
| author_facet | Modig, Per |
| author_sort | Modig, Per |
| collection | Epsilon Archive for Student Projects |
| description | Couch grass (Elymus repens (L.) Gould) is a severe weed in Sweden, and since both the use of herbicides and cultivation should be decreased, it will become increasingly problematic to control couch. The present work is meant to, by literature studies and an experiment, give some answers to the question if cutting and competition can depress the growth of couch. The experiment was carried out in the growing season 2001 at Ultuna, Uppsala, in plastic boxes. The design was three-factorial randomised complete blocks. The factors were plant combination, nitrogen level and cutting strategy. The plant combinations were couch, couch + ryegrass (Lolium perenne L.), couch + white clover (Trifolium repens L.). Nitrogen levels were 64 and 193 kg N/ha. Cutting carried out at hights of 4 cm above ground, 12 cm above ground and no cutting. After the plants in all boxes had been cut at 8 cm 10 weeks after sowing, cuttings were made twice at 4 and 12 cm respectively, 14 and 17 weeks after sowing. All cut material was sorted and measured by weight and at the end of the experiment, 21 weeks after sowing and planting, all rhizomes were measured by weight.
The amount of rhizomes produced when couch growed without competition and with low cutting was 47% of the amount without cutting. In competition with ryegrass and white clover the amount with low cutting was 72 and 55%, respectively, of the amount without cutting. In competition with ryegrass without cutting, the amount of rhizomes was
20% of the amount without competition. In competition with white clover the amount was 46% of the amount without competition. The total regrowth after the first cutting of couch above ground with low cutting and in competition with ryegrass and white clover was 91 and 87%, respectively, of the total regrowth without cutting. The regrowth of ryegrass and white clover was 85 and 64%, respectively, of the regrowth without cutting.
The proportion between couch growth above and below ground differed at different situations of competition and cutting. Uncut couch with no competition showed to have a larger part below ground than other combinations. In competition with ryegrass or white clover, the part below ground was lower than without competition. Where cutting was carried out, the part of couch biomass below ground was smaller than without cutting. The proportion between couch growth above and below ground was lower at high nitrogen level. The difference between nitrogen levels was smaller in competition with ryegrass and still smaller in competition with white clover.
The most important conclusions of the project is that cutting and competition depress the below ground growth of couch. Three cuttings at the 4-cm level halved the amount of rhizomes produced without competition. Competition from ryegrass reduced the amount rhizomes to 20% of the amount without competition.
Agrovoc: Elymus repens, Lolium perenne, Trifolium repens, plant competition, cutting, weed control |
| format | Otro |
| id | RepoSLU11958 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish swe |
| publishDate | 2007 |
| publishDateSort | 2007 |
| record_format | eprints |
| spelling | RepoSLU119582018-10-09T10:51:05Z https://stud.epsilon.slu.se/11958/ Kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd Modig, Per Weeds and weed control Couch grass (Elymus repens (L.) Gould) is a severe weed in Sweden, and since both the use of herbicides and cultivation should be decreased, it will become increasingly problematic to control couch. The present work is meant to, by literature studies and an experiment, give some answers to the question if cutting and competition can depress the growth of couch. The experiment was carried out in the growing season 2001 at Ultuna, Uppsala, in plastic boxes. The design was three-factorial randomised complete blocks. The factors were plant combination, nitrogen level and cutting strategy. The plant combinations were couch, couch + ryegrass (Lolium perenne L.), couch + white clover (Trifolium repens L.). Nitrogen levels were 64 and 193 kg N/ha. Cutting carried out at hights of 4 cm above ground, 12 cm above ground and no cutting. After the plants in all boxes had been cut at 8 cm 10 weeks after sowing, cuttings were made twice at 4 and 12 cm respectively, 14 and 17 weeks after sowing. All cut material was sorted and measured by weight and at the end of the experiment, 21 weeks after sowing and planting, all rhizomes were measured by weight. The amount of rhizomes produced when couch growed without competition and with low cutting was 47% of the amount without cutting. In competition with ryegrass and white clover the amount with low cutting was 72 and 55%, respectively, of the amount without cutting. In competition with ryegrass without cutting, the amount of rhizomes was 20% of the amount without competition. In competition with white clover the amount was 46% of the amount without competition. The total regrowth after the first cutting of couch above ground with low cutting and in competition with ryegrass and white clover was 91 and 87%, respectively, of the total regrowth without cutting. The regrowth of ryegrass and white clover was 85 and 64%, respectively, of the regrowth without cutting. The proportion between couch growth above and below ground differed at different situations of competition and cutting. Uncut couch with no competition showed to have a larger part below ground than other combinations. In competition with ryegrass or white clover, the part below ground was lower than without competition. Where cutting was carried out, the part of couch biomass below ground was smaller than without cutting. The proportion between couch growth above and below ground was lower at high nitrogen level. The difference between nitrogen levels was smaller in competition with ryegrass and still smaller in competition with white clover. The most important conclusions of the project is that cutting and competition depress the below ground growth of couch. Three cuttings at the 4-cm level halved the amount of rhizomes produced without competition. Competition from ryegrass reduced the amount rhizomes to 20% of the amount without competition. Agrovoc: Elymus repens, Lolium perenne, Trifolium repens, plant competition, cutting, weed control Kvickroten (Elymus repens (L.) Gould) är ett mycket betydelsefullt ogräs i Sverige, och när både kemisk bekämpning och jordbearbetning ska reduceras är den ett problem. Detta arbete försöker genom litteraturstudier och experiment ge svar på om klippning tillsammans med konkurrens kan vara ett sätt att hämma kvickrotstillväxten. Ett experiment genomfördes under växtsäsongen 2001 på Ultuna, Uppsala, som ett trefaktoriellt blockförsök i lådor. Faktorerna var grödkombination, kvävenivå och klippstrategi. Grödkombinationerna var kvickrot, kvickrot + engelskt rajgräs (Lolium perenne L.) och kvickrot + vitklöver (Trifolium repens L.). Kvävenivåerna var 64 resp 193 kg N/ha och klippstrategierna 4 cm stubbhöjd, 12 cm stubbhöjd samt oklippt. Alla led klipptes en gång med 8 cm stubbhöjd 10 veckor efter sådd och plantering. Klippning med 4 respektive 12 cm stubbhöjd gjordes två gånger, 14 och 17 veckor efter sådd. Allt klippt material sorterades och vägdes, och vid experimentets avslutning 21 veckor efter sådd och plantering vägdes även kvickrotens utlöpare. Mängden utlöpare hos kvickrot utan konkurrens var vid låg klippning 47% av mängden utan klippning. I konkurrens med rajgräs och vitklöver var mängden vid låg klippning 72 respektive 55% av mängden utan klippning. I led med enbart konkurrens med rajgräs, utan klippning, var mängden utlöpare en femtedel av mängden utan konkurrens. I konkurrens med vitklöver var mängden något mindre än hälften av mängden utan konkurrens. Kvickrotens återväxt ovan jord efter låg klippning och i konkurrens med rajgräs och vitklöver var 91 resp 87% av återväxten utan klippningar. Återväxten hos rajgräs och vitklöver var 85 respektive 64% av återväxten utan klippning. Vid olika konkurrens- och klippningssituationer var förhållandet mellan kvickrotens tillväxt ovan och under jord olika. Oklippt kvickrot i renbestånd hade större andel under jord än andra led. Vid konkurrens med rajgräs eller vitklöver var andelen biomassa under jord mindre än i led utan konkurrens. Vid klippning ändrades förhållandet mellan den totala ovanoch underjordiska tillväxten så att andelen av kvickrotens biomassa under jord var mindre i klippta led än i oklippta led. Även vid olika kvävenivå ändrades förhållandet mellan ovan- och underjordisk tillväxt så att andelen underjordisk biomassa var lägre vid hög kvävenivå än vid låg. Skillnaden mellan kvävenivåerna var mindre vid konkurrens med rajgräs och speciellt med vitklöver. De viktigaste slutsatserna av arbetet är att klippning hämmar den underjordiska tillväxten av kvickrot så att tre klippningar med låg stubbhöjd kan halvera mängden utlöpare vid tillväxt utan konkurrens. Vid konkurrens från rajgräs utan klippning minskade mängden utlöpare till ca 20% av mängden utan konkurrens. 2007-02-16 Other NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/11958/1/modig_p_171115.pdf Modig, Per, 2007. Kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd. UNSPECIFIED, Uppsala. Uppsala: (NL, NJ) > Dept. of Crop Production Ecology <https://stud.epsilon.slu.se/view/divisions/OID-500.html> urn:nbn:se:slu:epsilon-s-8820 swe |
| spellingShingle | Weeds and weed control Modig, Per Kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd |
| title | Kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd |
| title_full | Kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd |
| title_fullStr | Kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd |
| title_full_unstemmed | Kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd |
| title_short | Kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd |
| title_sort | kvickrotens reaktion på klippning och konkurrens i rajgräs- och vitklöverbestånd |
| topic | Weeds and weed control |
| url | https://stud.epsilon.slu.se/11958/ https://stud.epsilon.slu.se/11958/ |