TITLE:
Physical and Chemical Properties and Plant Growth in an Engineered Soil Manufactured from Bauxite Residue, Green Waste Compost and Increasing Amounts of Sand
AUTHORS:
Xinting Weng, Richard Haynes, Yafeng Zhou
KEYWORDS:
Engineered Soil, Manufactured Soil, Bauxite Residue, Optimized Bauxite Residue, Sand, Ryegrass Growth
JOURNAL NAME:
Open Journal of Soil Science,
Vol.15 No.1,
January
17,
2025
ABSTRACT: A new manufactured soil product (Turba) was produced using acidified bauxite residue into which 10% green waste compost had been incorporated. A laboratory/greenhouse experiment was carried out to determine if sand could be used as an ingredient or an amendment for Turba. Sand was added at rates of 0%, 5%, 10%, 25, 50% and 75% (w/w) in two different ways 1) by incorporating it into the Turba during its manufacture (IN) or 2) by mixing it with Turba aggregates after their manufacture (OUT). Incorporation of sand into Turba aggregates (IN) decreased the percentage of sample present as large aggregates (2 - 4 mm dia.) after crushing and sieving (