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Evaluation of Hemarthria compressavarieties at a frost-prone site in up-land areas of South-west China

Evaluation of Hemarthria compressavarieties at a frost-prone...

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中国—澳大利亚可持续性草地管理研讨会

作者： CH.H.Yang~(1 2) J.G.Han~(1*) L.ZH.Chen~2 SH.M.Su~2 X.Q.Zhang~2 1 Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing 2 Department of Grassland Science Animal Science and Technological College Sichuan Agricultural University Ya’an China

＜正＞Hemarthria compressa accessions ’Chonggao’,’Guangyi’,’Yaan’,H031 and H042 were planted on a up-land areas of Tianquan,Sichuan Province,south-west china in 2006 using stem pieces as propagules and irrigation to promote *** weedy conditions the coarse-stemmed lines established in 8 months,whereas the others two fine-stemmed lines had to be replanted with turfs to obtain satisfactory establishment which took more than 1 *** 2006-2007 there were no damaging frosts and all lines had high annual dry matter（DM） yields of up to 25 and 23 t/ha under mowing heights of 5 and 10 cm *** to -4.1℃in winter 2007 severely damaged ’Chonggao’ and ’Guangyi’ irrespective of mowing height and their 2007-2008 yields were reduced to 13-16t DM/*** frosts had only minor effects on H031 and H042 and their yields remained high. ’Yaan’rated intermediate in response to 2007 *** winter 2008 ’Chonggao’,’Guangyi’were eliminated by frosts,whereas H031 and H042 were severely damaged by frosts under 5 cm mowing but were little affected under 10 cm mowing *** none of the five Hemarthrias was completely winter-hardy,the results suggested that ’Yaan’ could be grown at frost-prone sites if close grazing was avoided.

关键词： Hemarthria compressa cut height winter hardiness summer production frost damage plant establishment vegetative propagation

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