Biochar’s effect on crop productivity and the dependence on experimental conditions—a meta-analysis of literature data
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Background and aims
For the last decade, there has been an increasing global interest in using biochar to mitigate climate change by storing carbon in soil. However, there is a lack of detailed knowledge on the impact of biochar on the crop productivity in different agricultural systems. The objective of this study was to quantify the effect of biochar soil amendment (BSA) on crop productivity and to analyze the dependence of responses on experimental conditions.
A weighted meta-analysis was conducted based on data from 103 studies published up to April, 2013. The effect of BSA on crop productivity was quantified by characterizing experimental conditions.
In the published experiments, with biochar amendment rates generally <30 t ha−1, BSA increased crop productivity by 11.0 % on average, while the responses varied with experimental conditions. Greater responses were found in pot experiments than in field, in acid than in neutral soils, in sandy textured than in loam and silt soils. Crop response in field experiments was greater for dry land crops (10.6 % on average) than for paddy rice (5.6 % on average). This result, associated with the higher response in acid and sandy textured soils, suggests both a liming and an aggregating/moistening effect of BSA.
The analysis suggests a promising role for BSA in improving crop productivity especially for dry land crops, and in acid, poor-structured soils though there was wide variation with soil, crop and biochar properties. Long-term field studies are needed to elucidate the persistence of BSA’s effect and the mechanisms for improving crop production in a wide range of agricultural conditions. At current prices and C-trading schemes, however, BSA would not be cost-effective unless persistent soil improvement and crop response can be demonstrated.
KeywordsC-sequestration Soil fertility Soil amendment Meta-analysis Soil carbon
Biochar soil amendment
Relative change over control
This work was financially supported by NSFC under a grant 40830528 and by Ministry of Agriculture under a grant 2110402-201261. We are grateful to the authors of the literature cited for their constructive original research and the information provided for this analysis. Thanks also go to the audience comments given at preliminary presentations of this work at workshops related to biochar issues in 2012.
- Asai H, Samson BK, Stephan HM, Songyikhangsuthor K, Homma K, Kiyono Y, Inoue Y, Shiraiwa T, Horie T (2009) Biochar amendment techniques for upland rice production in Northern Laos 1. Soil physical properties, leaf SPAD and grain yield field crop research. Field Crop Res 111:81–84CrossRefGoogle Scholar
- Joseph SD, Graber ER, Chia C, Munroe P, Donne S, Nielsen T, Marjo TS, Rutlidge C, Pan GX, Li L, Taylor P, Rawal A, Hook J. (2013) Shifting paradigms on biochar: micro/nano-structures and soluble components are responsible for its plant-growth promoting ability. Carbon Management (in press)Google Scholar
- Pan GX, Lin ZH, Li LQ, Zhang AF, Zheng JW, Zhang XH (2011) Perspective on biomass carbon industrialization of organic waste from agriculture and rural areas in China. J Agric Sci Tech 13:75–82 (in Chinese with English abstract)Google Scholar
- Qin HZ, Liu YY, Li LQ, Pan GX, Zhang XH, Zheng JW (2012) Adsorption of cadmium in solution by biochar from household biowaste. J Ecol Rural Environ 28:181–186 (in Chinese with English abstract)Google Scholar
- Shang QY, Yang XX, Gao CM, Wu PP, Liu JJ, Xu YC, Shen QR, Zou JW, Guo SW (2011) Net annual global warming potential and greenhouse gas intensity in Chinese double rice-cropping systems: a 3-year field measurement in long-term fertilizer experiments. Glob Chang Biol 17:2196–2210CrossRefGoogle Scholar
- Smith P, Martino Z, Cai ZC, Gwary D, Janzen H, Kumar P, McCarl B, Ogle S, O’Mara F, Rice C, Scholes B, Sirotenko O (2007) Agriculture. In: Metz B, Davidson OR, Dave R, Meyer LA (eds) Climate Change 2007: mitigation. Contribution of Working Group III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, pp 498–540Google Scholar
- Spokas KA, Reicosky DC (2009) Impact of sixteen different biochars on soil greenhouse gas production. Ann Environ Sci 3:179–193Google Scholar
- Taghizadeh-Toosi A, Clough TJ, Condron LM, Sherlock RR, Anderson CR, Craigie RA (2011) Biochar incorporation into pasture soil suppresses in situ nitrous oxide emissions from ruminant urine patches. J Environ Qual 40:468–476Google Scholar
- van Zwieten L, Singh B, Jospeh S, Kimber S, Cowie A, Chan KY (2009) Biochar and emissions of non-CO2 greenhouse gases from soil. In: Lehmann J, Joseph S (eds) Biochar for environmental management: science and technology. Earthscan, London, pp 227–249Google Scholar
- Zhang AF, Bian RJ, Pan GX, Cui LQ, Hussain Q, Li LQ, Zheng JW, Zheng JF, Zhang XH, Han XJ, Yu XY (2012a) Effect of biochar amendment on soil quality, crop yield and greenhouse gas emission in a Chinese rice paddy: a field study of 2 consecutive rice growing cycles. Field Crop Res 127:153–160CrossRefGoogle Scholar
- Zhang B, Liu XY, Pan GX, Zheng JF, Chi ZZ, Li LQ, Zhang XH, Zheng JW (2012c) Changes in soil properties, yield and trace gas emission from a paddy after biochar amendment in two consecutive rice growing cycles. Sci Agric Sin 45:4844–4853 (in Chinese with English abstract)Google Scholar