Biochar-based fertilizer: Supercharging root membrane potential and biomass yield of rice

Chew Jinkiat, Zhu Longlong, Nielsen Shaun, Graber Ellen Ruth, Mitchell David R.G., Horvat Joseph, Mohammed Mohanad, Liu Minglong, van Zwieten Lukas, Donne Scott, Munroe Paul, Taherymoosavi Sara, Pace Ben, Rawal Aditya, Hook James, Marjo Chris, Thomas Donald S., Pan Genxing, Li Lianqing, Bian Rongjun, McBeath Anna, Bird Michael, Thomas Torsten, Husson Olivier, Solaiman Zakaria, Joseph Stephen, Fan Xiaorong. 2020. Biochar-based fertilizer: Supercharging root membrane potential and biomass yield of rice. Science of the Total Environment, 713:136431, 11 p.

Quartile : Q1, Sujet : ENVIRONMENTAL SCIENCES

Résumé : Biochar-based compound fertilizers (BCF) and amendments have proven to enhance crop yields and modify soil properties (pH, nutrients, organic matter, structure etc.) and are now in commercial production in China. While there is a good understanding of the changes in soil properties following biochar addition, the interactions within the rhizosphere remain largely unstudied, with benefits to yield observed beyond the changes in soil properties alone. We investigated the rhizosphere interactions following the addition of an activated wheat straw BCF at an application rates of 0.25% (g·g−1 soil), which could potentially explain the increase of plant biomass (by 67%), herbage N (by 40%) and P (by 46%) uptake in the rice plants grown in the BCF-treated soil, compared to the rice plants grown in the soil with conventional fertilizer alone. Examination of the roots revealed that micron and submicron-sized biochar were embedded in the plaque layer. BCF increased soil Eh by 85 mV and increased the potential difference between the rhizosphere soil and the root membrane by 65 mV. This increased potential difference lowered the free energy required for root nutrient accumulation, potentially explaining greater plant nutrient content and biomass. We also demonstrate an increased abundance of plant-growth promoting bacteria and fungi in the rhizosphere. We suggest that the redox properties of the biochar cause major changes in electron status of rhizosphere soils that drive the observed agronomic benefits.

Mots-clés Agrovoc : Oryza, fertilisation, charbon de bois, rhizosphère, oxydoréduction, propriété physicochimique du sol, biologie du sol

Mots-clés géographiques Agrovoc : Chine

Mots-clés libres : Biochar, Redox, Rice

Classification Agris : F04 - Fertilisation
F62 - Physiologie végétale - Croissance et développement
P33 - Chimie et physique du sol
F63 - Physiologie végétale - Reproduction

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Chew Jinkiat, Nanjing Agricultural University (CHN)
• Zhu Longlong, Nanjing Agricultural University (CHN)
• Nielsen Shaun, UNSW Sidney (AUS)
• Graber Ellen Ruth, Institute of Soil, Water and Environmental Sciences (ISR)
• Mitchell David R.G., University of Wollongong (AUS)
• Horvat Joseph, University of Wollongong (AUS)
• Mohammed Mohanad, University of Wollongong (AUS)
• Liu Minglong, Nanjing Agricultural University (CHN)
• van Zwieten Lukas, New South Wales Government Department of Primary Industries (AUS)
• Donne Scott, University of Newcastle (AUS)
• Munroe Paul, UNSW Sidney (AUS)
• Taherymoosavi Sara, UNSW Sidney (AUS)
• Pace Ben, UNSW Sidney (AUS)
• Rawal Aditya, UNSW Sidney (AUS)
• Hook James, UNSW Sidney (AUS)
• Marjo Chris, UNSW Sidney (AUS)
• Thomas Donald S., UNSW Sidney (AUS)
• Pan Genxing, Nanjing Agricultural University (CHN)
• Li Lianqing, Nanjing Agricultural University (CHN)
• Bian Rongjun, Nanjing Agricultural University (CHN)
• McBeath Anna, James Cook University (AUS)
• Bird Michael, James Cook University (AUS)
• Thomas Torsten, UNSW Sidney (AUS)
• Husson Olivier, CIRAD-PERSYST-UPR AIDA (FRA) ORCID: 0000-0001-9587-5819
• Solaiman Zakaria, AfricaRice (CIV)
• Joseph Stephen, University of Newcastle (AUS)
• Fan Xiaorong, Nanjing Agricultural University (CHN) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/594968/)

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