TY - JOUR

T1 - Better Together

T2 - Water Treatment Residual and Poor-Quality Compost Improves Sandy Soil Fertility.

AU - Clarke, Cathy E

AU - Stone, Wendy

AU - Hardie, Ailsa G

AU - Quinton, John

AU - Blake, Lynsay I.

AU - Johnson, Karen L

N1 - Copyright © 2019. . © 2019 The Author(s). Re-use requires permission from the publisher.

PY - 2019/10/17

Y1 - 2019/10/17

N2 - 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.

AB - 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.

U2 - 10.2134/jeq2019.03.0147

DO - 10.2134/jeq2019.03.0147

M3 - Journal article

VL - 48

SP - 1781

EP - 1788

JO - Journal of Environmental Quality

JF - Journal of Environmental Quality

SN - 0047-2425

IS - 6

ER -