caa a22 4500 606219447 CHVBK 20210128101118.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11104-015-2427-3 doi (NATIONALLICENCE)springer-10.1007/s11104-015-2427-3 Enhanced biological N2 fixation and yield of faba bean ( Vicia faba L.) in an acid soil following biochar addition: dissection of causal mechanisms [Elektronische Daten] [Lukas Van Zwieten, Terry Rose, David Herridge, Stephen Kimber, Josh Rust, Annette Cowie, Stephen Morris] 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 15 N 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. The Author(s), 2015 Boron nationallicence Rhodic ferralsol nationallicence Field assessment nationallicence Lime nationallicence Compost nationallicence Molybdenum nationallicence Natural 15 N isotope abundance nationallicence Phosphorus nationallicence Van Zwieten Lukas NSW Department of Primary Industries, Bruxner Highway, Wollongbar, NSW, Australia aut Rose Terry Southern Cross Plant Science, Southern Cross University, Lismore, NSW, Australia aut Herridge David School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia aut Kimber Stephen NSW Department of Primary Industries, Bruxner Highway, Wollongbar, NSW, Australia aut Rust Josh NSW Department of Primary Industries, Bruxner Highway, Wollongbar, NSW, Australia aut Cowie Annette School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia aut Morris Stephen NSW Department of Primary Industries, Bruxner Highway, Wollongbar, NSW, Australia aut Plant and Soil Springer International Publishing 395/1-2(2015-10-01), 7-20 0032-079X 395:1-2<7 2015 395 11104 https://doi.org/10.1007/s11104-015-2427-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2427-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Van Zwieten Lukas NSW Department of Primary Industries, Bruxner Highway, Wollongbar, NSW, Australia aut NATIONALLICENCE 700 1- Rose Terry Southern Cross Plant Science, Southern Cross University, Lismore, NSW, Australia aut NATIONALLICENCE 700 1- Herridge David School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia aut NATIONALLICENCE 700 1- Kimber Stephen NSW Department of Primary Industries, Bruxner Highway, Wollongbar, NSW, Australia aut NATIONALLICENCE 700 1- Rust Josh NSW Department of Primary Industries, Bruxner Highway, Wollongbar, NSW, Australia aut NATIONALLICENCE 700 1- Cowie Annette School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia aut NATIONALLICENCE 700 1- Morris Stephen NSW Department of Primary Industries, Bruxner Highway, Wollongbar, NSW, Australia aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 395/1-2(2015-10-01), 7-20 0032-079X 395:1-2<7 2015 395 11104