Deng, Yuling

Peng, Yan

Wang, Yukuan

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Effects of Nitrogen Fertilizers on Growth and Turf Quality of Kentucky Bluegrass Yuling Deng Sichuan Agricultural University, China Yan Peng Sichuan Agricultural University, China Yukuan Wang Chinese Academy of Sciences, China 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/21/2-2/12 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. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]357　 瞯Grasslands/Rangelands Resources and Ecology ——— Soil Quality and Plant NutritionEffects of nitrogen fertilizers on growth and turf quality of Kentucky bluegrassYulin Deng1 , Y an Peng2 , Y ukuan W ang31 College o f Forestry and Horticulture , Sichuan A gricultural University , Y aan , Sichuan 625000 ,PRC , E‐mail :yulindeng66＠ 126 .com ,2 College o f A nimal Sicence , S ichuan A gricultural University , Y aan 625000 , PRC , 3 ChengduInstitute o f Mountain H az ards and Env ironment , Chinese A cademy os Sciences , Chengdu610041 ,PRCKey words : Poa pratensis cv .Huntsville , nitrogen , fertilization , turfIntroduction Interest in turf establishment has boomed in many urban areas of China . Fertilizer application requirements are akey topic in turf management . Various formulations of N‐based fertilizers are available for lawn turf . Previous fertilizationstudies with cool‐season turf have used soluble , fast‐release N formulations ( Moore , R .W . , N .E . １９９７) , or a combination offast‐and slow‐release N formulations ( Moore , R .W . １９９６ ) . Little research has directly compared effects of conventional Nfertilizers on introduced Kentucky bluegrass in China .Materials and methods The experimental design was a factorial treatment arrangement with a control ( without fertilization )( marked as H１ ,H２ ,H３ ,H４ and H５ (CK) ( Table １ ) in a randomized complete block ( ２m × １m , total １５ blocks) on Kentuckybluegrass ( Poa pratensis cv .Huntsville ) . Four conventional nitrogen fertilizers were added ( ammonium sulphate , sodiumnitrate ,ammonium nitrate and urea) under three repetitions . We also fertilizied ８０ pots ( Ф０ .２３m × ０ .２０m ) with the sametreatment regime to determine the biomass yield .Results and discussion (１) Any kind of N fertilization significantly accelerated the foliation velocity and grow th rate but withoutany significant differences among ４ N sources . In the early period af ter seeding , no significant effect of N fertilizers could bedetermined on bifurcating ability , but af ter grow th , N fertilization in autumn could greatly improve bifurcation in next spring .Among ４ N sources , ammonium sulphate was the most effective application . Furthermore , turf‐formation velocity could beaccelerated . Compared with the control , turf on an N fertilized field could be formed ３０ days earlier . Admittedly , Nfertilization can effectively improve the turf grow th and earlier formation .( ２ ) ４ N fertilizers could significantly ( p ＝ ０ .０１ )deepen the greenness . In spring growing season ( see Table １ ) , ４ N sources made no differences on their effects whereas inautumn growing season ( from October to November) , U rea application could more significantly increase the leaf chlorophyllcontent of Kentucky bluegrass . ( ３ ) The experiment revealed that ４ N fertilizer applications could significantly increase thebiomass of Kentucky bluegrass , but no difference could be testified for effects on aboveground biomass among differentfertilizers .(４) Summer withering rate did not reach its peak in the warmest period till late September because of an accumulatedhigh temperature effect . After September １７th , reviving would occur . For different N source applications , any treatment couldsignificantly reduce summer withering rate and ammonium sulphate could be more effective .Table 1 E f f ect o f N f ertiliz ers on grwoth o f K entucky bluegrass .T reatmentAverage foliage Grow th rate( cm / d) Averagebifurcation leaf chlorophyll content ( LCC)Apr２４thMay１４thBeforemowed Aftermowed Sep１４th NextApr １４th May１３th May３１st Jun１１th Oct１st Nov４thH１ j２ U.８７ a ４ 种.４３ ab ０ p.１６７ a ０  .３２０ a ２ 构.６９ a ４ R.０９ a ２ 葺.２１ A ２ v.１２ A ２ .０１ A １ 寣.３０ AB １ _.３７ ABH２ j２ U.８０ a ４ 种.０２ ab ０ p.１７５ a ０  .３１０ a ２ 构.１３ a ２ ;.４１ bc ２ 葺.１９ A ２ v.１１ A １ .９４ A １ �.１１ B １ 倐.１７ BH３ j２ U.８２ a ４ 种.４０ ab ０ p.１８０ a ０  .３６０ a ２ 构.５０ a ３ :.７７ ab ２ 葺.１０ A ２ v.０４ A １ .９３ A １ 寣.１６ AB １ 倐.２５ BH４ j２ U.９６ a ４ 铑.９２ a ０ p.１８０ a ０  .３２０ a ２ 构.２０ a ３ S.３２ c ２ 葺.２５ A ２ v.０５ A １ .８５ A １ è.４２ A １ {.５５ ACK ２ R.５９ b ３ 腚.８２ b ０ m.０７０ b ０  .１９０ b ２ 构.１６ a １ S.９７ c １ 滗.５５ B １ }.６９ B １ .５６ B ０ �.６３ C ０ 亖.７９ CConclusions N fertilizers can be effectively applied in turf establishment of Kentucky bluegrass in the sub‐tropic area and canimprove the foliation , grow th of plants and turf formation and quality , and much better in autumn . Moreover , N sources canhave different affects . Ammonium sulphate could be more effective for bifurcation and summer tolerance whereas urea for rootgrow th and greenness .ReferencesMao Tie ,Kangfang ,Xie .(１９９３) .Methodology on turf quality appraisal .[ J] Journal o f G rass Science ,８ :６９‐７４ .Moore , R .W . , N .E . Christians , and M .L . Agnew . ( １９９６ ) . Response of three Kentucky bluegrass cultivars to sprayablenitrogen fertilizer programs . Crop Sci . ３６ :１２９６‐１３０１ .

Effects of Nitrogen Fertilizers on Growth and Turf Quality of Kentucky Bluegrass

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Effects of Nitrogen Fertilizers on Growth and Turf Quality of Kentucky Bluegrass

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