Potential for suppression of Rhizoctonia root rot is influenced by nutrient (N and P) and carbon inputs in a highly calcareous coarse-textured topsoil
Rowena S. Davey A B , Ann M. McNeill
A D , Stephen J. Barnett B and Vadakattu V. S. R. Gupta C D
+ Author Affiliations
- Author Affiliations
A School of Agriculture, Food and Wine and The Waite Research Institute, University of Adelaide, PMB1, Urrbrae, SA, Australia.
B Soil Biology and Diagnostics, South Australian Research and Development Institute (SARDI), GPO Box 397, Adelaide, SA, Australia.
C CSIRO Agriculture and Food, Locked Bag No. 2, Glen Osmond, SA 5064, Australia.
D Corresponding authors. Email: ann.mcneill@adelaide.edu.au; gupta.vadakattu@csiro.au
Soil Research 59(4) 329-345 https://doi.org/10.1071/SR20247
Submitted: 25 August 2020 Accepted: 20 November 2020 Published: 27 January 2021
Journal Compilation © CSIRO 2021 Open Access CC BY-NC-ND
Abstract
Bioassays were undertaken in a controlled environment to assess whether the potential for suppression of Rhizoctonia root rot of wheat, in a highly calcareous topsoil, was positively influenced by nutrient (nitrogen (N) or phosphorus (P)) addition and whether any disease suppression response to augmented nutrition was affected by the addition of carbon (C), either as a readily available C source (sucrose) or as wheat stubble. The soil was P deficient, which limited plant growth, populations of putatively beneficial soil microorganisms, and microbial activity and diversity. This ultimately reduced potential for suppression of Rhizoctonia solani AG8. Addition of fertiliser P to the soil increased R. solani AG8 DNA and percent root infection but not the effectiveness of the pathogen. A positive effect of P fertiliser on plant growth partially compensated for the negative effect of increased root infection. Addition of P increased DNA for Microbacterium spp. where labile C had been added and in the presence of plant roots. Stubble addition alone, after 6 weeks of incubation, increased DNA for Pantoea agglomerans, Trichoderma A and Microbacterium spp. although differences in microbial activity and diversity between stubble treatments were only detected after the bioassay had commenced and P was added. Fertiliser P addition to stubble-amended soil resulted in less Rhizoctonia infection compared with that in soil without P or stubble addition. Effectiveness of R. solani AG8 was decreased by 50% with stubble amendment. The application of N alone did not have a marked effect on plant growth or potential for suppression of Rhizoctonia root disease. Agronomic management practices that affect quantity and lability of C input to soil, when combined with strategic P fertiliser decisions, are likely to improve the potential for development of suppression of Rhizoctonia root rot disease in cereal crops on alkaline and highly calcareous soils.
Keywords: calcareous, microbial diversity, nitrogen, phosphorus, soil-borne diseases, Rhizoctonia, stubble management, suppression.
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