Organic waste amendment effects on soil microbial activity in a corn–rye rotation: Application of a new approach to community-level physiological profiling |
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| Authors: | JL Garland CL Mackowiak MC Zabaloy |
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| Institution: | 1. Dynamac Corporation, Kennedy Space Center, FL 32899, USA;2. University of Florida, North Florida Research and Education Center, Quincy, FL 32351-5677, USA;3. Center of Renewable Resources of Semiarid Region (CERZOS), Department of Agronomy, South National, University (UNS), 8000 Bahía Blanca, Argentina |
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| Abstract: | The role of phosphorus (P) application and arbuscular mycorrhizal fungi (AMF) on growth, arsenic (As) and P accumulation in lettuce plants growing in an As-polluted soil (total As 250 mg kg?1), was investigated. In particular, it was tested whether application of a commercial inoculum (CI), with (+P at 90 kg P ha?1) and without (?P at 0 kg P ha?1) P fertilizer, supported greater plant growth and provided more P, enhancing As tolerance, than indigenous fungi alone. The influence of these treatments on As and P availability in the rhizosphere and bulk soils was also investigated. Greenhouse pot experiments were established where plants were grown with and without commercial inoculum (+CI, ?CI) in unsterilized conditions. Inoculation with commercial inoculum and P application together considerably increased plant biomass, by enhancing host plant P nutrition and lowering shoot and root As concentrations compared to plants inoculated only with native AMF. In the rhizosphere of +CI+P plants there was P soil depletion compared to ?CI+P. The results evidenced that, with P addition, inoculation with commercial inoculum alleviated the toxicity of excessive As by improving P nutrition without increasing As concentrations in the plant, emphasizing the role of beneficial microbes and P fertilizer to improve soil fertility in As-contaminated soil. |
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