We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.

Durham Research Online
You are in:

Better together : water treatment residual and poor-quality compost improves sandy soil fertility.

Clarke, Catherine E. and Stone, Wendy and Hardie, Ailsa G. and Quinton, John N. and Blake, Lynsay I. and Johnson, Karen L. (2019) 'Better together : water treatment residual and poor-quality compost improves sandy soil fertility.', Journal of environment quality., 48 (6). pp. 1781-1788.


Water treatment residual (WTR) is an underused clean water industry byproduct, generally disposed to landfill. This study assesses the benefits and risks of ferric-WTR as a soil amendment or co-amendment for plant growth in a nutrient-poor sandy soil. A 12-wk pot trial tested the efficacy of WTR and a locally available, low-quality, municipal compost as single (1, 5, and 12.5% dry mass) and co-amended treatments (1:1 WTR/compost ratio, at 2, 10, and 25%) on wheat (Triticum aestivum L.) growth in a sandy soil. The low total N content of the compost and low WTR P and K contents resulted in significantly lower (up to 50% lower, p < 0.05) plant biomass in single amendments compared with the control, whereas the highest co-amendment produced significantly higher plant biomass (33% higher, p < 0.05) than the control. This positive co-amendment effect on plant growth is attributed to balanced nutrient provision, with P and K from the compost and N from the WTR. Foliar micronutrient and Al levels showed no toxic accumulation, and co-amended foliar Mn levels increased from near deficient (20 mg kg−1) to sufficient (50 mg kg−1). Total WTR metals were well below maximum land application concentrations (USDA). Trace element bioavailability remained the same (Ni, Cu, and Hg) or significantly decreased (B, Al, Cr, Mn, Fe, Zn, As, and Cd; p < 0.05) during the pot trial. These results suggest, within this context, that a WTR–compost co-amendment is a promising soil improvement technology for increasing crop yields in sandy soils.

Item Type:Article
Full text:(AM) Accepted Manuscript
Download PDF
Publisher Web site:
Date accepted:20 August 2019
Date deposited:22 November 2019
Date of first online publication:17 October 2019
Date first made open access:17 October 2020

Save or Share this output

Look up in GoogleScholar