Biochar amendment techniques for upland rice production in Northern Laos
Abstract
The objective of this study was to investigate the effect of biochar application (CA) on soil physical properties and grain yields of upland rice (Oryza sativa L.) in northern Laos. During the 2007 wet season, three different experiments were conducted under upland conditions at 10 sites, combining variations in CA amounts (0-16tha⁻¹), fertilizer application rates (N and P) and rice cultivars (improved and traditional) in northern Laos. CA improved the saturated hydraulic conductivity of the top soil and the xylem sap flow of the rice plant. CA resulted in higher grain yields at sites with low P availability and improved the response to N and NP chemical fertilizer treatments. However, CA reduced leaf SPAD values, possibly through a reduction of the availability of soil nitrogen, indicating that CA without additional N fertilizer application could reduce grain yields in soils with a low indigenous N supply. These results suggest that CA has the potential to improve soil productivity of upland rice production in Laos, but that the effect of CA application is highly dependent on soil fertility and fertilizer management.
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Biochar amendments improve soil bulk density, porosity, water retention, and hydraulic conductivity.
“Biochar amendments were reported to improve soil bulk density, porosity, water retention, and hydraulic conductivity (Abel et al., 2013; Asai et al., 2009; Atkinson et al., 2010; Jeffery et al., 2011; Karhu et al., 2011; Laird et al., 2010a).”
From A review on biochar modulated soil condition improvements and nutrient dynamics concerning crop yields: Pathways to climate change mitigation and global food security (2019) · cites this paper as Asai et al., 2009
The associated increase in soil pH with biochar addition would result in a greater availability of primary and secondary nutrients like K, P, Ca, Mg.
“The associated increase in soil pH with biochar addition would result in a greater availability of primary and secondary nutrients like K, P, Ca, Mg (Asai et al., 2009; Glaser et al., 2002; Major et al., 2010).”
From A review on biochar modulated soil condition improvements and nutrient dynamics concerning crop yields: Pathways to climate change mitigation and global food security (2019) · cites this paper as Asai et al., 2009
Yield reduction at a high rate of biochar application (16 Mg ha−1) was resonated to N limitation even with N fertilizer application.
“However, yield reduction at a high rate of biochar application (16 Mg ha -1 ) was resonated to N limitation even with N fertilizer application (Asai et al., 2009).”
From A review on biochar modulated soil condition improvements and nutrient dynamics concerning crop yields: Pathways to climate change mitigation and global food security (2019) · cites this paper as Asai et al., 2009
Applying N fertilizer proved beneficial to rice grain yield when 4.0 and 8.0 Mg ha−1 rates of two commercial biochars prepared from wood feedstocks were applied in northern Laos, but at higher dose of biochar (16 Mg ha−1) with N-fertilizer no positive yield response was observed.
“Similarly, applying N fertilizer proved beneficial to rice grain yield when 4.0 and 8.0 Mg ha -1 rates of two commercial biochars prepared from wood feedstocks (e.g., teak ( Tectona grandis L.) and rosewood ( Pterocarpus macrocarpus Kurz)) were applied in a study reported from northern Laos, but at higher dose of biochar (16 Mg ha -1 ) with N-fertilizer no positive”
From A review on biochar modulated soil condition improvements and nutrient dynamics concerning crop yields: Pathways to climate change mitigation and global food security (2019) · cites this paper as Asai et al., 2009
Higher grain yields in biochar treated plots (4.0 and 8.0 Mg ha−1) with N fertilizer resulted due to combined effects of improved soil physical properties and alleviation of biochar induced soil N availability.
“Higher grain yields in biochar treated plots (4.0 and 8.0 Mg ha -1 ) with N fertilizer resulted due to the combined effects of the improved soil physical properties and the alleviation of biochar induced soil N availability (Asai et al., 2009) .”
From A review on biochar modulated soil condition improvements and nutrient dynamics concerning crop yields: Pathways to climate change mitigation and global food security (2019) · cites this paper as Asai et al., 2009
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- Authors
- Asai, H., Samson, B. K., Stephan, H. M., Songyikhangsuthor, K., Homma, K., Kiyono, Y., Inoue, Y., Shiraiwa, T., & Horie, T.
- Affiliations
- Kyoto University (JP)
- International Rice Research Institute (PH)
- Forestry and Forest Products Research Institute (JP)
- National Institute for Agro-Environmental Sciences (JP)
- National Agriculture and Food Research Organization (JP)
- Corresponding author
- Asai, Hidetoshi
- Venue
- Field Crops Research
- Publisher
- Elsevier BV
- Published
- 2009-03
- Volume
- 111
- Issue
- 1-2
- Pages
- 81-84
- ISSN
- 0378-4290 (ISSN-L)
- OpenAlex
- W4292068520
- Cited by
- 931
- References
- 10
- Citations by year
- 2026: 27 · 2025: 53 · 2024: 60 · 2023: 80 · 2022: 61 · 2021: 77 · 2020: 87 · 2019: 71 · 2018: 83 · 2017: 58 · 2016: 72 · 2015: 59 · 2014: 35 · 2013: 38 · 2012: 34
- FWCI
- 14.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Field Crops Research (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Rice Cultivation and Yield Improvement
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Agricultural Science and Fertilization
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Keywords
- biochar amendment, upland rice, rice, grain yield, soil physical properties, saturated hydraulic conductivity, xylem sap flow, soil nitrogen availability, soil available phosphorus, nitrogen fertilizer response, phosphorus fertilizer response, leaf chlorophyll content, soil fertility, fertilizer management, northern Laos
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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