Modeling water flow and phosphorus sorption in a soil amended with sewage sludge and olive pomace as compost or biochar

Filipović, Vilim; Černe, Marko; Šimůnek, Jiří; Filipović, Lana; Romić, Marija; Ondrašek, Gabrijel; Bogunović, Igor; Mustać, Ivan; Krevh, Vedran; Ferenčević, Anja; Robinson, David; Palčić, Igor; Pasković, Igor; Goreta Ban, Smiljana; Užila, Zoran; Ban, Dean. 2020 Modeling water flow and phosphorus sorption in a soil amended with sewage sludge and olive pomace as compost or biochar [in special issue: Benefits and risks of biochar use for soil ecosystem services in agronomic applications] Agronomy, 10 (8), 1163. 20, pp.

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Organic amendments are often reported to improve soil properties, promote plant growth, and improve crop yield. This study aimed to investigate the effects of the biochar and compost produced from sewage sludge and olive pomace on soil hydraulic properties, water flow, and P transport (i.e., sorption) using numerical modeling (HYDRUS-1D) applied to two soil types (Terra Rosa and Rendzina). Evaporation and leaching experiments on soil cores and repacked soil columns were performed to determine the soil water retention, hydraulic conductivity, P leaching potential, and P sorption capacity of these mixtures. In the majority of treatments, the soil water retention showed a small increase compared to the control soil. A reliable fit with the modified van Genuchten model was found, which was also confirmed by water flow modeling of leaching experiments (R2 0.99). The results showed a high P sorption in all the treatments (Kd 21.24 to 53.68 cm3 g−1), and a high model reliability when the inverse modeling procedure was used (R2 0.93–0.99). Overall, adding sewage sludge or olive pomace as compost or biochar improved the Terra Rosa and Rendzina water retention and did not increase the P mobility in these soils, proving to be a sustainable source of carbon and P-rich materials.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Soils and Land Use (Science Area 2017-)
ISSN: 2073-4395
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: soil amendments, inverse estimation, numerical modeling, phosphate, HYDRUS
NORA Subject Terms: Agriculture and Soil Science
Date made live: 26 Aug 2020 10:46 +0 (UTC)

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