Assareh, M. H.

Jafari, A. A.

Rezaifard, M.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress Effects of Stage of Harvest on Yield and Quality Traits in Tall Fescue (Festuca arundinace) A. A. Jafari Research Institute of Forests and Rangelands, Iran M. Rezaifard Islamic Azad University, Iran M. H. Assareh Research Institute of Forests and Rangelands, Iran 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/21/15-2/9 The XXI International Grassland Congress / VIII 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 706　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　Grasslands/Rangelands Production Systems ——— Forage Quality ,Conservation and UtilizationEffects of stage of harvest on yield and quality traits in Tall fescue (Festuca arundinace)A .A . , Ja f ari1 M . Rezai f ard 2 , and M .H . Assareh 31 , 3 Research Institute o f Forests and Rangelands , Tehran , I ran , E‐mail : aa ja f ari ＠ ri f r‐ac .ir2 Postgraduate Student , Islamic A zad University , Bro j erd , I ranIntroduction Tall fescue ( Festuca arundinacea Schreb) is one o f the main perennial grasses that growsnaturally in temperatepasture and rangelands in north and west o f I ran . I t is used f or hay p roduction and graz ing by livestock . Tall f escue growsin I ran at elevations o f 1200m to 2900m in areas receiving more than 300 mm annual p recipation ( Rechinger , 1970 ) .Maturity stage at harvest is the most important f actor determining f orage quality in grass species . This study was designedto determine the e f f ect harvest date had on f orage dry matter ( DM) yield and three quality traits : dry matter digestibility(DMD) , water soluble carbohydrate ( WSC) , and crude p rotein (CP) in Tall f escue (Festuca arundinace Schreb) .Material and methods Eight foreign and domestic accessions of tall fescue were sown as spaced plants using a randomizedcomplete‐block design with two replications in irrigated plots . Plantings were made at the Research Institute of Forests andRangelands , Karaj , Iran in ２００４ . Main plots were divided into ５ subplots each containing １０ spaced plants in rows ５０ cmapart , with ４０ cm spacing within rows . No measurements were taken during the establishment year . Forage was cut at fivematurity stages ( vegetative , panicles emergence date , anthesis date , milky and soft dough seeds [ maturity ] ) . When harvestedplants were cut and weighed . A subsample was taken , dried at ７０ ℃ for １２ h , and reweighed to determine DM yield , thenground with a １ mm screen mill . Three quality traits ( DMD , WSC and CP) were estimated in the first cuts for two subsequentyears using near infrared spectroscopy ( NIR) . Details of the methodology and calibrations of NIR are given by Jafari et al .(2003) . Data were analy zed using a f actorial ex periment f or individual year . Data were also subj ected to a combinedanalysis o f variance across years using a sp lit‐p lot‐in‐time design with years as sub‐plots ( Steel & Torrie 1980) .Results and discussions Results showed the significant effects of phenological stages for all of traits . Average values of DM yieldwere increased from ３ .４ to ５ .４ ton/ ha from vegetative to soft dough stage , respectively ( Figure １ and ２ ) . In vegetative stage ,DM yield values were ５４ ％ lower than soft dough . Therefore , as a general rule one can estimate about half the yield atvegetative than what would be expected at soft dough in tall fescue . Percent of DMD and CP were highest when the plants wereimmature . CP tends to drop sharply as the plants go to milky stage and then its value was consistent from milky to soft doughstage ( Figure １ ) . DMD values were declined from ５５ .１８ to ４０ .６２ for vegetative and soft dough stage , respectively . DMDdeclines were slower than for CP with advancing maturity from vegetative to milky stages . But , DMD valuesdropped offsharply from milky to soft dough stage ( Figure ２ ) . The effects of genotypes were significant for DM yield and DMD ％ .Festurina with average values of ４ .９ ton/ h had higher DM yield over all of phenological stages . The genotypes × phenologyinteraction effect was significant for DM yield and non significant for three quality traits . Yields of quality traits (DMD , CP andWSC) were estimated for each phenological stage ( Figure ３ ) . The higher yield values for DMD , CP and WSC were obtained inmilky stage . Since , DM yield were consistent over both milky and soft dough stage , it was concluded that milky stage is thebest time of harvesting for both yield and quality traits in tall fescue under conservation management .Figure 1 The e f f ects o f maturitystages on both DM yield and CP ％in tall f escue .　 　 　Figure 2 The e f f ects o fmaturity stages on DM yieldand DMD ％ in tall f escue .　 　 　Figure 3 The e f f ects o fmaturity on CP yield , WSCyield and DMD yield .ReferenceJafari , A . , V . Connolly , A . Frolich and E . J . Walsh ２００３b . A note on estimation of quality parameters in perennial ryegrassby Near infrared reflectance spectroscopy . I rish Journal o f Agricultural and Food Research , ４２ : ２９３‐２９９ .

Effects of Stage of Harvest on Yield and Quality Traits in Tall Fescue (\u3ci\u3eFestuca arundinace\u3c/i\u3e)

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=3603&amp;context=igc

Effects of Stage of Harvest on Yield and Quality Traits in Tall Fescue (\u3ci\u3eFestuca arundinace\u3c/i\u3e)

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