Contrasted effect of biochar and earthworms on rice growth and resource allocation in different soils
Open accessAbstract
Adding biochar to soils and maintaining high earthworm biomasses are potential ways to increase the fertility of tropical soils and the sustainability of crop production in the spirit of agroecology and ecological engineering. However, a thorough functional assessment of biochar effect on plant growth and resource allocations is so far missing. Moreover, earthworms and biochar increase mineral nutrient availability through an increase in mineralization and nutrient retention respectively and are likely to interact through various other mechanisms. They could thus increase plant growth synergistically. This hypothesis was tested for rice in a greenhouse experiment. Besides, the relative effects of biochar and earthworms were compared in three different soil treatments (a nutrient rich soil, a nutrient poor soil, a nutrient poor soil supplemented with fertilization). Biochar and earthworm effects on rice growth and resource allocation highly depended on soil type and were generally additive (no synergy). In the rich soil, there were both clear positive biochar and earthworm effects, while there were generally only positive earthworm effects in the poor soil, and neither earthworm nor biochar effect in the poor soil with fertilization. The analysis of earthworm and biochar effects on different plant traits and soil mineral nitrogen content, confirmed that they act through an increase in nutrient availability. However it also suggested that another mechanism, such as the release in the soil of molecules recognized as phytohormones by plants, is also involved in earthworm action. This mechanism could for example help explaining how earthworms increase rice resource allocation to roots and influence the allocation to grains.
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No interaction with respect to mineral N was found between earthworms and biochar.
“and no interaction with respect to mineral N”
From A Review of Biochar and Soil Nitrogen Dynamics (2013) · cites this paper as [83]
Table 1 reports significant earthworm–biochar interactions for mineral-N measures: ammonium in all three soils and nitrate in the poor soil. Section 3.1 also describes non-additive effects, contrary to the claim that no interaction was found. Page numbers are unavailable in our copy. (LLM, conf=0.91)
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measuredDifferences in mineral N were observed with treatments but were soil type dependent.
“while differences in mineral N were observed with treatments these were soil type dependant”
From A Review of Biochar and Soil Nitrogen Dynamics (2013) · cites this paper as [83]
Few interactions between earthworms and biochar were found.
“they found few interactions between earthworms and biochar”
From A Review of Biochar and Soil Nitrogen Dynamics (2013) · cites this paper as [83]
The lack of interaction between earthworms and biochar with respect to mineral N may be due to the short term nature of the mesocosm study.
“possibly as a result of the short term nature of the mesocosm study.”
From A Review of Biochar and Soil Nitrogen Dynamics (2013) · cites this paper as [83]
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- Authors
- Noguera, D., Rondón, M., Laossi, K.-R., Hoyos, V., Lavelle, P., Cruz de Carvalho, M. H., & Barot, S.
- Affiliations
- Institut d'écologie et des sciences de l'environnement de Paris (FR)
- International Development Research Centre (CA)
- Etude et Compréhension de la biodiversité (FR)
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Noguera, Diana
- Venue
- Soil Biology and Biochemistry
- Publisher
- Elsevier BV
- Published
- 2010-07
- Volume
- 42
- Issue
- 7
- Pages
- 1017-1027
- ISSN
- 0038-0717 (ISSN-L)
- OpenAlex
- W2001143279
- Cited by
- 185
- References
- 73
- Citations by year
- 2026: 3 · 2025: 10 · 2024: 15 · 2023: 10 · 2022: 14 · 2021: 10 · 2020: 15 · 2019: 12 · 2018: 11 · 2017: 12 · 2016: 17 · 2015: 11 · 2014: 7 · 2013: 11 · 2012: 14
- FWCI
- 20.12
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Soil Biology and Biochemistry (publishedVersion)
- CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research) (submittedVersion, other-oa)
- HAL (submittedVersion)
- Funders
- Agence Nationale de la Recherche
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Agricultural Science and Fertilization
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Invertebrate Taxonomy and Ecology
- Keywords
- biochar, earthworms, rice, plant growth, resource allocation, soil nutrient availability, soil fertility, low-fertility soils, fertilization, soil nitrogen, plant hormones, tropical soils
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