Jarvis, P.

Lucas, R. J.

Sedcole, J. R.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Caucasian Clover (Trifolium ambiguum) Is Persistent in New Zealand Montane, Improved Rangeland But Requires Regular Sulphur Application for Productivity P. Jarvis Lincoln University, New Zealand R. J. Lucas Lincoln University, New Zealand J. R. Sedcole Lincoln University, New Zealand Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/2-1/15 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 ]310　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Soil Quality and Plant NutritionCaucasian clover ( Tri folium ambiguum ) is persistent in New Zealand montane , improvedrangeland but requires regular sulphur application for productivityP . Jarv is , R .J . Lucas and J .R .Sedcole . L incoln University , A griculture and L i f e Sciences Div ision , PO Box 84 , L incolnUniversity , New Zealand . E‐mail : sue‐peter .j arv is＠ x tra .co .nzKey words :Caucasian clover , Kura clover , T ri f olium ambiguum , persistence , sulphurIntroduction Caucasian clover ( Cc) became dominant af ter １０ years in a ２５ species , grazed pasture under higher rates ofphosphorus ( P) and sulphur ( S ) . At low P and S inputs , Cc persisted but was unproductive on the low fertility tussockgrassland site ( Scott , １９９８) . This paper records the outstanding persistence and productivity of Cc when S and P were appliedregularly to two rangeland sites in the upper Rangitata valley ( Lat ４３°S , Long １７１°E) .Methods Jarvis et al . (１９９８) reported responses of hexaploid Monaro Cc to S fertiliser for an experiment which was established(５００m asl ,９４０ mm rainfall) in spring １９９２ . P at ５ rates and S at ４ rates were applied in １９９８ and again in ２００１ . Plots were cutin December each year to obtain spring / early summer herbage accumulation and botanical composition . A similar experimentwas established on a higher terrace (７００m asl ,１０００mm rainfall) in １９７５ ( Lucas et al . ,１９８１) .This site has been top‐dressed at２‐３ year intervals at ２００kg / ha sulphur superphosphate (８％ P , ２０％ S) for the last ２０ years .Results and discussion Figure １ shows the large DM response of Cc to S and P in ２００２ after treatments were reapplied in ２００１ .Three years later the responses to P were less marked especially at low S ( Figure ２) . The mean ２００５ yields were less that halfthose of ２００２ . Craighead and Metherell ( ２００６ ) also indicated that S applications are required more regularly than P . In the１９７５ experiment , Cc has persisted in the sward for more than ３２ years and is still a significant contributor to the pasture underintensive continuous grazing by red deer . The grass component was dominated by A grostis cap illaris and A nthoxanthumodoratum at both sites . The １５％ cover of the prostrate invasive H ieracium p ilosella present at the start of each experimentwas suppressed after ３ years by the application of P and S fertiliser and Cc seed .　 　 　 Figure 1 Cc DM (kg/ ha) ２００２ . 　 　 　 Figure 2 Cc DM (kg / ha) ２００５ .Conclusions Caucasian clover is well adapted to the montane rangeland regions of New Zealand . Persistence is currentlydemonstrated at sites at ７００ and ５５０m a .s .l . where Cc was sown in spring １９７５ and １９９２ .Sulphur applications are requiredevery ２‐３ years to maintain productivity at these inland sitesReferencesAllan , B .E . , Keoghan , J .M . １９９４ . More persistent legumes and grasses for oversown tussock country . Proceedings o f theNew Zealand Grassland A ssociation ６０ , １４３‐１４７ .Craighead , M .D . , Metherell , A .K . ２００６ . The impact of the form and frequency of sulphur on pasture yield and compositionin South Island high country . Proceedings o f the New Zealand G rassland A ssociation ６８ , ３６１‐３６７ .Jarvis , P . , Lucas , R . J . , Sedcole , J .R . , White , J .G . H . １９９８ . Responses of Caucasian clover to sulphur fertiliser .Proceedings o f the New Zealand G rassland A ssociation ６０ , １９３‐１９７ .Lucas , R .J . , White , J .G .H . , Daly , G .T . , Jarvis , P . , Meijer , G . １９８１ . Lotus , white clover and Caucasian cloveroversowing , Mesopotamia Station , South Canterbury . Proceedings o f the New Zealand G rassland A ssociation ４２ , １４２‐１５１ .Scott , D . １９９８ . Six teen years of Caucasian clover under contrasting managements . Proceedings o f the New ZealandG rassland A ssociation ６０ , １１５‐１１８ ."' 'ro .I:: .c 0) "' -"' - ' :;; :;; D D ~ w > 0 0 u 1000 u 80 

Caucasian Clover (\u3cem\u3eTrifolium ambiguum\u3c/em\u3e) Is Persistent in New Zealand Montane, Improved Rangeland But Requires Regular Sulphur Application for Productivity

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Caucasian Clover (\u3cem\u3eTrifolium ambiguum\u3c/em\u3e) Is Persistent in New Zealand Montane, Improved Rangeland But Requires Regular Sulphur Application for Productivity

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