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Short-term effects of organo-mineral enriched biochar fertiliser on ginger yield and nutrient cycling |
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| Authors: | Farrar Michael B. Wallace Helen M. Xu Cheng-Yuan Nguyen Thi Thu Nhan Tavakkoli Ehsan Joseph Stephen Bai Shahla Hosseini |
| Affiliation: | 1.Genecology Research Centre, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Maroochydore DC, QLD, 4558, Australia ;2.Environmental Futures Research Institute, School of Natural Sciences, Griffith University, Nathan, Brisbane, QLD, 4111, Australia ;3.School of Medical and Applied Sciences, Central Queensland University, Bundaberg, QLD, 4760, Australia ;4.Faculty of Environment, Hanoi University of Natural Resources and Environment, Hanoi, Vietnam ;5.NSW Department of Primary Industries, Pine Gully Rd, Wagga Wagga, NSW, 2650, Australia ;6.Graham Centre for Agricultural Innovation (an alliance between NSW Department of Primary Industries and Charles Sturt University), Wagga Wagga, NSW, Australia ;7.School of Materials Science and Engineering, University of New South Wales, Sydney, NSW, 2052, Australia ; |
| Abstract: | Purpose Biochar has agronomic potential but currently is too expensive for widespread adoption. New methodologies are emerging to reduce the cost such as enriching biochar with nutrients that match crops and soil requirements. However, the effects of biochar-based fertilisers on plant yield and soil nutrient availability have not been widely examined. This study investigated the effects of a novel organo-mineral biochar fertiliser in comparison to organic and commercial biochar fertiliser on ginger (Zingiber officinale Canton). Materials and methodsThere were four treatments: (1) commercial organic fertiliser (5 t ha?1), as the control; (2) commercial biochar-based fertiliser (5 t ha?1); (3) organo-mineral biochar fertiliser at low rate (3 t ha?1); and (4) organo-mineral biochar fertiliser at high rate (7.5 t ha?1). A replicated pot trial was established with black dermosol soil and ten replicate pots for each treatment. Ginger was planted and grown for 30 weeks. Plant growth, biomass, foliar nutrients and water extractable soil nutrients including phosphorus (P), potassium (K) and calcium (Ca) were examined. Results and discussionHigh rate organo-mineral biochar fertiliser increased soil P and K availability at week 30 (harvest) after planting, compared to all other treatments and low rate organo-mineral biochar fertiliser performed similarly to the organic control for P and K. High rate organo-mineral biochar fertiliser increased total foliar nutrient content at week 30 in P, K and Ca compared to commercial biochar fertiliser. High rate organo-mineral biochar fertiliser improved the commercial value of ginger (+?36%) due to a shift in the proportion of higher grade rhizomes. Low rate organo-mineral biochar fertiliser plants displayed similar yield, total dry and aboveground biomass to commercial organic fertiliser. Commercial biochar fertiliser had significantly lower biomass measures compared with other treatments as the rate applied had lower nutrient concentrations. ConclusionsOur results show organo-mineral biochar fertilisers could be substituted for commercial organic fertilisers at low rates to maintain similar yield or applied at high rates to increase commercial value where economically feasible. |
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