Growth of rye grass and clover in artificial topsoils: a case study

L. Mundodi, M. Yellishetty, V. Wong, A. Walmsley, J. Missen, N. Anderson

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

1 Citation (Scopus)

Abstract

The Latrobe Valley region of eastern Victoria houses three major mines which burns lignite for power generation and is referred to as the power house of Victoria. These mines are looking for sustainable ways to manage their waste and achieve successful mine rehabilitation. One of the problems to be addressed for attaining successful mine rehabilitation is the scarcity of topsoils for vegetation cover. The possible solution for overcoming this problem is the use of artificial topsoils (ATS) developed using waste streams, i.e. overburden, interseam brown coal, ash from the onsite powerplant and nearby paper industry waste i.e. effluent sewage recovery (ESR). Field lysimeter experiments with ATS proved that there is no leachate toxicity but the plant available nutrients were relatively low. Hence, clear understanding of ATS as a substrate for vegetation should be examined before applying it in the field. In a recent study, we tested the growth of ryegrass, clover and ryegrass + clover mixture in ATS with and without addition of nitrogen-phosphorous-potassium fertilizer (NPK) in a greenhouse experiment compared to control, i.e. overburden, overburden + ash, natural topsoil. The results after 12 weeks indicate that the height of ryegrass in ATS with NPK is 2.7 cm higher than the height of ryegrass in natural topsoil and is 16 and 17 cm higher than the growth of ryegrass in overburden and overburden + ash mixture respectively. The height of clover in ATS with NPK is 1 cm higher than the clover grown in natural topsoil and around 5 cm more than the height of clover in overburden and overburden + ash mixture. The germination in ATS was slightly delayed as compared to natural topsoil due to higher exchangeable sodium percent in soil, but the presence of NPK in ATS later aided in survival and growth of grass and clover. The initial results from these experiments show that ATS with addition of NPK can be a potential solution in mine rehabilitation and can be used as a substrate for revegetation.

Original languageEnglish
Title of host publicationMine Closure 2019 - Proceedings of the 13th International Conference on Mine Closure
EditorsAndy Fourie, Mark Tibbett
PublisherAustralian Centre for Geomechanics
Pages733-740
Number of pages8
ISBN (Electronic)9780987638939
DOIs
Publication statusPublished - 2019
EventInternational Conference on Mine Closure 2019 - Perth, Australia
Duration: 3 Sept 20195 Sept 2019
Conference number: 13th

Publication series

NameProceedings of the International Conference on Mine Closure
Volume2019-September
ISSN (Print)2208-8288
ISSN (Electronic)2208-8296

Conference

ConferenceInternational Conference on Mine Closure 2019
Abbreviated titleMine Closure 2019
Country/TerritoryAustralia
CityPerth
Period3/09/195/09/19

Keywords

  • Artificial topsoil
  • Growth
  • Mine rehabilitation

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