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Title: Enhanced biological N2 fixation and yield of faba bean ('Vicia faba' L.) in an acid soil following biochar addition: dissection of causal mechanisms
Contributor(s): Van Zwieten, Lukas (author); Rose, Terry (author); Herridge, David  (author)orcid ; Kimber, Stephen (author); Rust, Josh (author); Cowie, Annette  (author); Morris, Stephen (author)
Publication Date: 2015
Open Access: Yes
DOI: 10.1007/s11104-015-2427-3Open Access Link
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Abstract: Background and aims Acid soils constrain legume growth and biochars have been shown to address these constraints and enhance biological N₂ fixation in glasshouse studies. A dissection of causal mechanisms from multiple crop field studies is lacking. Methods In a sub-tropical field study, faba bean ('Vicia faba' L.) was cultivated in rotation with corn ('Zea mays') following amendment of two contrasting biochars, compost and lime in a rhodic ferralsol. Key soil parameters and plant nutrient uptake were investigated alongside stable ¹⁵N isotope methodologies to elucidate the causal mechanisms for enhanced biological N₂ fixation and crop productivity. Results Biological N₂ fixation was associated with plant Mo uptake, which was driven by reductions in soil acidity following lime and papermill (PM) biochar amendment. In contrast, crop yield was associated with plant P and B uptake, and amelioration of soil pH constraints. These were most effectively ameliorated by PM biochar as it addressed both pH constraints and low soil nutrient status. Conclusions While liming resulted in the highest biological N₂ fixation, biochars provided greater benefits to faba bean yield by addressing P nutrition and ameliorating Al toxicity.
Publication Type: Journal Article
Source of Publication: Plant and Soil, 395(1-2), p. 7-20
Publisher: Springer Netherlands
Place of Publication: The Netherlands
ISSN: 1573-5036
Field of Research (FOR): 070302 Agronomy
050303 Soil Biology
070306 Crop and Pasture Nutrition
Socio-Economic Outcome Codes: 961402 Farmland, Arable Cropland and Permanent Cropland Soils
960904 Farmland, Arable Cropland and Permanent Cropland Land Management
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Journal Article
School of Environmental and Rural Science

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