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《Heilongjiang Agricultural Sciences》 2017-10
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Effects of Plant Densities on Growth and Yield of Taraxacum kok-saghyz

SHEN Guang;WEI Dian-wen;ZENG Xiang-jun;ZHENG Fu-yun;CHEN Fei;LI Li;Key Laboratory of Forest Plant Ecology,Ministry of Education,Northeast Forestry University;Institute of Natural Resources and Ecology,Heilongjiang Academy of Sciences;Heilongjiang Academy of Sciences;  
Russian dandelion is one of the most promising natural rubber resources which may take the place of rubber tree,has a brhght future.Effects of plant densities(15 cm×15 cm,20 cm×20 cm,25 cm×25 cm,30 cm×30 cm,35 cm×35 cm)on growth of aboveground and underground parts and yield of Russian dandelion were analyzed by applying single-factor experimental design in a field and using elite cutivar-K445 introduced from Russia.the results showed that aboveground biomass was the highest when plant density for 25 cm×25 cm.Plant densities also affected rubber concent of Russian dandelion significantly.And rubber concent would get above 6.0% when plant densities for 20 cm×20 cm as well as 35 cm×35 cm.Underground biomass per plant increased with the decrease of plant density,and the highest reached 8.9 g.While underground biomass per unit area would not increase any more when plant density was over 20 cm×20 cm when it was 152.2 g·m~(-2).When plant density was 30 cm×30 cm,total sugar concent reached the highest point,namely 46.83%.Total sugar yield showed the same trend as underground biomass per unit area,the highest being 64.83 g·m~(-2).When plant density was 20 cm×20 cm,rubber yield per unit area got the highest point,namely 9.4 g·m~(-2).While plant density was 35 cm×35 cm,average rubber yield per plant was the highest,namely 535.3 mg.Rratio of root to leaf increased with the decrease of plant density,when more biomass were allocated to underground parts.Therefore,plant density,35 cm×35 cm,is suitable for selection and breeding of Russian dandelion,while plant density,20 cm×20 cm,is suitable for industrial production.
【Fund】: 黑龙江省科学院团队提升专项资助项目(2014ST06);; 黑龙江省科学院预研资助项目(YY20172R03);; 哈尔滨市科技局应用技术研究与研发资助项目(2014AE4AE053)
【CateGory Index】: S576
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