An assessment of emergy, energy, and cost-benefits of grain production over 6 years following a biochar amendment in a rice paddy from China

Wang, Lei; Li, Lianqing; Cheng, Kun; Ji, Chunying; Ye, Qian; Bian, Rongjun; Pan, Genxing

doi:10.1007/s11356-018-1245-6

Cited by 36 publications

(10 citation statements)

References 42 publications

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“…Global data showed a generally negative change in crop productivity with biochar addition over 40 t ha −1 despite the validity of a mean increase by 10% (Liu et al, 2013 ). Our present study suggested the addition of biochar at low dosage (<0.1%) in rice hydroponic culture for seedling growth, regardless of biochar type, could achieve the cost-effective use of biochar, an issue regarding with biochar sue in rice agriculture (Wang et al, 2018 ).…”

Section: Discussionmentioning

confidence: 80%

“…While the high rate of biochar application had often been in debt for cost-effectiveness (Clare et al, 2015 ), the one-time medium rate of biochar amendment (20 t ha −1 , ca. 1% to topsoil) in a Chinese rice paddy had brought out a 6-year long net gain of crop productivity and economic return (Wang et al, 2018 ). Therefore, the technology for value-added biochar use should be urged to make biochar production and application viable (Clare et al, 2015 ; Pan et al, 2015 ), such as biochar-based fertilizer (Joseph et al, 2013 ) or valued use of separated biochar DOM (Bian et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

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Rice Seedling Growth Promotion by Biochar Varies With Genotypes and Application Dosages

Liu

Zhi

et al. 2021

Front. Plant Sci.

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While biochar use in agriculture is widely advocated, how the effect of biochar on plant growth varies with biochar forms and crop genotypes is poorly addressed. The role of dissolvable organic matter (DOM) in plant growth has been increasingly addressed for crop production with biochar. In this study, a hydroponic culture of rice seedling growth of two cultivars was treated with bulk mass (DOM-containing), water extract (DOM only), and extracted residue (DOM-free) of maize residue biochar, at a volumetric dosage of 0.01, 0.05, and 0.1%, respectively. On seedling root growth of the two cultivars, bulk biochar exerted a generally negative effect, while the biochar extract had a consistently positive effect across the application dosages. Differently, the extracted biochar showed a contrasting effect between genotypes. In another hydroponic culture with Wuyunjing 7 treated with biochar extract at sequential dosages, seedling growth was promoted by 95% at 0.01% dosage but by 26% at 0.1% dosage, explained with the great promotion of secondary roots rather than of primary roots. Such effects were likely explained by low molecular weight organic acids and nanoparticles contained in the biochar DOM. This study highlights the importance of biochar DOM and crop genotype when evaluating the effect of biochar on plants. The use of low dosage of biochar DOM could help farmers to adopt biochar technology as a solution for agricultural sustainability.

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Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Rice Seedling Growth Promotion by Biochar Varies With Genotypes and Application Dosages

Liu

Zhi

et al. 2021

Front. Plant Sci.

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“…The biochar amendment could effectively improve water retention capacity in a sandy loam soil (Aller et al 2017;Amoakwah et al 2017b;Hansen et al 2016;Igalavithana et al 2017) consequently decreasing the N fertilizer leaching (Sanger et al 2017;Sun et al 2017). The studies investigating the beneficial effects of biochar on soil properties and plant growth were conducted on a long-term basis (Griffin et al 2017;Haider et al 2017;Hardy et al 2017;He et al 2018b;Laird et al 2017;Luo et al 2017;Madari et al 2017;Qin et al 2016;Sanger et al 2017;Wang et al 2018). The long-term field experiments could provide significant data for the assessment of agronomic benefits of biochar application.…”

Section: Soil Quality and Plant Growthmentioning

confidence: 99%

A scientometric review of biochar research in the past 20 years (1998–2018)

Ata-Ul-Karim

Singh

et al. 2019

Biochar

182

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Biochar is the carbon-rich product obtained from the thermochemical conversion of biomass under oxygen-limited conditions. Biochar has attained extensive attention due to its agronomical and environmental benefits in agro-ecosystems. This work adopts the scientometric analysis method to assess the development trends of biochar research based on the literature data retrieved from the Web of Science over the period of 1998-2018. By analysing the basic characteristics of 6934 publications, we found that the number of publications grew rapidly since 2010. Based on a keyword analysis, it is concluded that scholars have had a fundamental recognition of biochar and preliminarily found that biochar application had agronomic and environmental benefits during the period of 1998-2010. The clustering results of keywords in documents published during 2011-2015 showed that the main research hotspots were "biochar production", "biochar and global climate change", "soil quality and plant growth", "organic pollutants removal", and "heavy metals immobilization". While in 2016-2018, beside these five main research hotspots, "biochar and composting" topic had also received greater attention, indicating that biochar utilization in organic solid waste composting is the current research hotspot. Moreover, updated reactors (e.g., microwave reactor, fixed-bed reactor, screw-feeding reactor, bubbling fluidized bed reactor, etc.) or technologies (e.g., solar pyrolysis, Thermo-Catalytic Reforming process, liquefaction technology, etc.) applied for efficient energy production and modified biochar for environmental remediation have been extensively studied recently. The findings may help the new researchers to seize the research frontier in the biochar field.

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“…The final step is calculation of emergy-based indices used to assess various aspects of performance, such as resource use efficiency, environmental impact, system sustainability. Just as other studies on the sustainability of agricultural systems [35][36][37], emergy-power density (EPD), emergy self-sufficiency ratio (ESR), emergy yield ratio (EYR), environmental loading ratio (ELR), emergy restoration ratio (ERR), emergy benefit ratio (EBR) and emergy sustainability index (ESI) were used for balanced emergy analysis ( Table 2, Table A1).…”

Section: Emergy Analysismentioning

confidence: 99%

Emergy and Economic Evaluation of Seven Typical Agroforestry Planting Patterns in the Karst Region of Southwest China

Zou

Zeng

Wang

et al. 2019

Forests

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As a vast degraded land ecosystem, the karst region of southwest China is currently experiencing serious conflicts between restoration of degraded vegetation communities and agricultural activities. Furthermore, it is not clear what land use pattern suits local farmers best. To evaluate the sustainability of the degraded agricultural ecosystems in the region, methods for emergy analysis were used to compare the ecological and economic benefits from seven typical agroforestry planting patterns in the Yunnan province. The eco-efficiencies of the apple pattern (AP), pear pattern (PP), pomegranate pattern (PRP) were all lower than that of the traditional corn pattern (CP), although the economic benefit was higher than that of CP. Ecological benefits of the apple-soybean pattern (ASP) and the pear-pumpkin pattern (PPP) were not significantly improved, while ecological and economic benefits of the pomegranate-grass-sheep pattern (PGSP) was improved significantly. Intercropping pumpkin in PP increased the economic efficiency by 28.3%, which was superior to that of the intercropping of soybeans (4.6%) in AP. These data implied that interplanting crops in AP and PP might result in higher economic benefit than the existing interplanting pattern. The multistory agroforestry planting pattern and raising in PGSP could optimize the relationship among tree-grass-sheep and improve ecological and economic benefits. Additionally, scenario analysis showed that local farmers might enjoy better ecological and economic benefits at a large scale by optimizing current agricultural production patterns. Our results suggest that together, both the local government and farmers can adjust the structure of agroforestry ecosystems to foster the sustainable development of the ecological industry in the karst region of China.

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An assessment of emergy, energy, and cost-benefits of grain production over 6 years following a biochar amendment in a rice paddy from China

Cited by 36 publications

References 42 publications

Rice Seedling Growth Promotion by Biochar Varies With Genotypes and Application Dosages

Rice Seedling Growth Promotion by Biochar Varies With Genotypes and Application Dosages

A scientometric review of biochar research in the past 20 years (1998–2018)

Emergy and Economic Evaluation of Seven Typical Agroforestry Planting Patterns in the Karst Region of Southwest China

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