Effects of commercial microbial biostimulants on soil and root microbial communities and sugarcane yield
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ORIGINAL PAPER
Effects of commercial microbial biostimulants on soil and root microbial communities and sugarcane yield Shelby Berg 1 & Paul G. Dennis 2 & Chanyarat Paungfoo-Lonhienne 1,3 & Jay Anderson 1 & Nicole Robinson 1 & Richard Brackin 1 & Adam Royle 4 & Lawrence DiBella 4 & Susanne Schmidt 1 Received: 1 April 2019 / Revised: 12 October 2019 / Accepted: 22 October 2019 # Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract Ameliorating biological attributes of agricultural soils is desirable, and one avenue is introducing beneficial microbes via commercial biostimulant products. Although gaining popularity with farmers, scientific evaluation of such products in fieldgrown crops is often lacking. We tested two microbial products, Soil-Life™ and Nutri-Life Platform®, in a commercial sugarcane crop by profiling bacterial and fungal communities in soil and roots using high throughput phylogenetic marker gene sequencing. The products, one predominantly consisting of Lactobacillus and the other of Trichoderma, were applied as a mixture as per manufacturers’ instructions. Additives included in the formulations were not listed, and plots that did not receive the product mixture were the controls. The compositions of bacterial communities of soil and sugarcane roots, sampled 2, 5 and 25 weeks after application, were unaffected by the products. Soil fungal communities were also unaffected, but sugarcane roots had a greater relative abundance of three unidentified taxa in genera Marasmius, Fusarium and Talaromyces in the treated plots. Sugarcane yield was similar across all treatments that included a 25% lower nitrogen fertiliser rate. Further research must examine if the altered root fungal community is a consistent feature of the tested products, and if it conveys benefits. We conclude that putative biostimulants can be evaluated by analysing the composition of microbial communities. DNA profiling should be complemented by cost-benefit analysis to build a public information base documenting the effects of microbial biostimulants. Such knowledge will assist manufacturers in product development and farmers in making judicious decisions on product selection, to ensure that the anticipated benefits of microbial biostimulants are realised for broad acre cropping. Keywords Microbial biostimulants . Crop probiotics . Beneficial microbes . Root microbial communities . Soil microbial communities . Sugarcane
Introduction Soils support critical ecosystem services with the provision of food and clean water (Baveye et al. 2016). To maximise agricultural productivity, soils require significant intervention,
* Shelby Berg [email protected] 1
School of Agriculture and Food Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
2
School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
3
Present address: Sustainable Organic Solutions Pty. Ltd., Indooroopilly, Brisbane, QLD 4068, Australia
4
Herbert Cane Productivity Services Ltd., Ingha
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