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Acta Prataculturae Sinica ›› 2020, Vol. 29 ›› Issue (11): 118-128.DOI: 10.11686/cyxb2020005

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Effects of rooting media amendments on seed germination and seedling growth of four bioenergy grass species grown on electrolytic manganese residue

LUO Yang1,2, LIU Fang1,*, REN Jun1,2, ZHU Jian1   

  1. 1. College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China;
    2. School of Geography and Resources, Guizhou Education University, Guiyang 550018, China
  • Received:2020-01-07 Revised:2020-02-11 Online:2020-11-20 Published:2020-11-20
  • Contact: *E-mail: lfang6435@163.com
  • Supported by:
    国家自然科学基金委员会-贵州省人民政府喀斯特科学研究中心项目(U1612442-3),国家自然科学基金项目(41661094)和贵州省科技计划项目(黔科合基础[2019]1247号)资助

Abstract: This research investigated seed germination and seedling growth of four species of bioenergy grass (Pennisetum americanum×Pennisetum purpureum, Pennisetum purpureum, Pennisetum hydridum and Sorghum sudanense), grown on electrolytic manganese residue (control) or electrolytic manganese residue after adding one of three amendments (5% diatomite, 5% charcoal or 2.5% charcoal+2.5% diatomite). Germination percentage for the four bioenergy grasses ranked: P. purpureum>P. americanum×P. purpureum>S. sudanense>P. hydridum. The three amendments all significantly improved the germination percentage, germination energy and germination index of P. hydridum, and for the other three grasses the germination energy and germination index in the mixed amendment treatment of diatomite and charcoal were also significantly higher than those of the control group (P<0.05). Compared with the control group, in the amendment treatments, the fresh weights of P. americanum×P. purpureum, P. purpureum, P. hydridum and S. sudanense were increased by 36.54%, 7.69%, 35.71% and 23.88%, respectively. Amendment application also enhanced chlorophyll content and the activities of antioxidant enzymes (superoxide dismutase, peroxidase, catalase), while the malondialdehyde content of leaves was decreased. Based on the germination, growth and physiological parameters, for the tested bioenergy grasses grown on the electrolytic manganese residue, P. purpureum with 2.5% charcoal and 2.5% diatomite amendment performed best, followed by P. americanum×P. purpureum with 5% diatomite amendment.

Key words: electrolytic manganese residue, energy grass, germination, amendment