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  • Effects of amendments and fertilization on plant growth, nitrogen and phosphorus availability in rehabilitated highly alkaline bauxite-processing residue sand

    Author(s)
    Goloran, JB
    Phillips, IR
    Xu, ZH
    Condron, LM
    Chen, CR
    Griffith University Author(s)
    Xu, Zhihong
    Chen, Chengrong
    Goloran, Johnvie B.
    Year published
    2014
    Metadata
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    Abstract
    The effects of organic-inorganic amendments and nitrogen-phosphorus (NP) fertilization (NH4NO3 plus Ca (H2PO4)2) on ryegrass (Lolium rigidum) growth, and nitrogen (N) and phosphorus (P) availability in highly alkaline bauxite-processing residue sand (BRS), were examined in a pot experiment. The BRS used was either unamended (control) or amended with organic (e.g. greenwaste compost and biochar) or inorganic (e.g. zeolite) materials at a rate of 10% v/v. BRS from 15 years of rehabilitation (15YRRH) was also used as the second control. NP fertilizer was applied at different rates. The experimental set up was arranged in a two ...
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    The effects of organic-inorganic amendments and nitrogen-phosphorus (NP) fertilization (NH4NO3 plus Ca (H2PO4)2) on ryegrass (Lolium rigidum) growth, and nitrogen (N) and phosphorus (P) availability in highly alkaline bauxite-processing residue sand (BRS), were examined in a pot experiment. The BRS used was either unamended (control) or amended with organic (e.g. greenwaste compost and biochar) or inorganic (e.g. zeolite) materials at a rate of 10% v/v. BRS from 15 years of rehabilitation (15YRRH) was also used as the second control. NP fertilizer was applied at different rates. The experimental set up was arranged in a two factorial complete randomized design. BRS with zeolite and 15YRRH at NP fertilizer rates of 2.0 and 2.5 t/ha produced the highest dry matter, leaf N concentration and N uptake by ryegrass, which were significantly higher (P < 0.05) than the other treatments, suggesting the potential of zeolite in providing stability of applied N fertilizer in BRS. Further, BRS with biochar at NP rates 2.0 and 2.5 t/ha can also be suitable amendments as they enhance growth and also improved the N and P supplying capacity of BRS. Ryegrass leaf P concentration and P uptake were above the critical P values in the 15YRRH compared with organic-inorganic amended BRS, suggesting that time is important for better P uptake from the residue. It is concluded that zeolite and biochar combined with appropriate NP fertilizer rates can improve plant growth and provide a source of nutrients for ryegrass establishment in bauxite residue storage areas. The results need to be tested in field conditions before being advised in farming practice.
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    Journal Title
    Soil Use and Management
    Volume
    30
    DOI
    https://doi.org/10.1111/sum.12109
    Subject
    Soil Chemistry (excl. Carbon Sequestration Science)
    Soil Sciences
    Crop and Pasture Production
    Publication URI
    http://hdl.handle.net/10072/67794
    Collection
    • Journal articles

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