Commentary on four publications testing the effectiveness of biostimulant products on pasture recovery from pasture dieback: an agronomy viewpoint

Terry J. Rose; Abraham J. Gibson; Suzanne P. Boschma

doi:10.1071/CP25059

RESEARCH ARTICLE (Open Access)

Next Contents Vol 76(7)

Commentary on four publications testing the effectiveness of biostimulant products on pasture recovery from pasture dieback: an agronomy viewpoint

Terry J. Rose

^A ^* , Abraham J. Gibson

^A and Suzanne P. Boschma

^B

+ Author Affiliations

- Author Affiliations

^A Faculty of Science and Engineering, Southern Cross University, 1 Military Road, Lismore, NSW, Australia.

^B New South Wales Department of Primary Industries and Regional Development, 4 Marsden Park Rd, Tamworth, NSW, Australia.

^* Correspondence to: terry.rose@scu.edu.au

Handling Editor: Brendan Cullen

Crop & Pasture Science 76, CP25059 https://doi.org/10.1071/CP25059

Submitted: 6 March 2025 Accepted: 28 May 2025 Published: 20 June 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Pasture dieback is a disorder of tropical perennial grass species leading to the death of susceptible species and a reduction in feed for livestock. The spread of the disorder into north-eastern NSW in 2020 has led graziers in the region to search for management strategies to help combat the effects of dieback. Four individual publications based on data from central Queensland have drawn conclusions that commercial biostimulant products promote pasture recovery from dieback. In the mind of the public and landholders suffering from the effects of pasture dieback, these have created a reasonably compelling case for the use of such products in the management of dieback. In this perspective paper, we critically examine the agronomic methods, statistical analyses, data presented, and conclusions drawn across these four publications. We make the case that many of the methods are poorly described or inappropriate, the statistical analyses and means comparisons are largely invalid and the conclusions drawn do not align with the data presented. We conclude that, on the whole, the four publications present little compelling evidence for any agronomic benefits of the biostimulant products tested, and that the conclusions drawn by the authors of these publications are over-optimistic and misleading.

Keywords: Heliococcus summervillei, humates, pasture mealybug, phytogenic liquid, plant growth promotants, sea minerals, trimercapto-S-triazine, tropical pastures.

References

Buck SR (2017) Pasture dieback: past activities and current situation across Queensland (2017). Department of Agriculture and Fisheries Project Report, Brisbane, Qld, Australia. Available at http://era.daf.qld.gov.au/id/eprint/6521/1/Pasture-dieback-past-activities-and-current-situationacross-Queensland-2017.pdf

Fang H, Zi-Wen X, Hai-gang L, Yan G, Bao-guo L, Yun-ling L, Yun-Tao M (2022) Image-based root phenotyping for field-grown crops: an example under maize/soybean intercropping. Journal of Integrative Agriculture 21(6), 1606-1619.
| Crossref | Google Scholar |

Gibson AJ, McGregor H, Rose TJ, Jennings N (2024) The spread of mealybug-associated pasture dieback into the New South Wales wet subtropics. Australian Geographer 55(4), 527-539.
| Crossref | Google Scholar |

Hunt LP, McIvor JG, Grice AC, Bray SG (2014) Principles and guidelines for managing cattle grazing in the grazing lands of northern Australia: stocking rates, pasture resting, prescribed fire, paddock size and water points – a review. The Rangeland Journal 36(2), 105-119.
| Crossref | Google Scholar |

Li GD, Lodge GM, Moore GA, Craig AD, Dear BS, Boschma SP, Albertsen TO, Miller SM, Harden S, Hayes RC, Hughes SJ, Snowball R, Smith AB, Cullis BC (2008) Evaluation of perennial pasture legumes and herbs to identify species with high herbage production and persistence in mixed farming zones in southern Australia. Australian Journal of Experimental Agriculture 48(4), 449-466.
| Crossref | Google Scholar |

Li GD, Nie ZN, Boschma SP, Dear BS, Lodge GM, Hayes RC, Clark B, Hughes SJ, Humphries AW (2010) Persistence and productivity of Medicago sativa subspecies sativa, caerulea, falcata and varia accessions at three intermittently dry sites in south-eastern Australia. Crop & Pasture Science 61(8), 645-658.
| Crossref | Google Scholar |

Lodge GM, Murphy SR (2002) Ground cover in temperate native perennial grass pastures. II. Relationship with herbage and litter mass. The Rangeland Journal 24(2), 301-312.
| Crossref | Google Scholar |

Lodge GM, Murphy SR, Harden S (2003a) Effects of grazing and management on herbage mass, persistence, animal production and soil water content of native pastures. 2. A mixed native pasture, Manilla, North West Slopes, New South Wales. Australian Journal of Experimental Agriculture 43(8), 891-905.
| Crossref | Google Scholar |

Lodge GM, Murphy SR, Harden S (2003b) Effects of continuous and seasonal grazing strategies on the herbage mass, persistence, animal productivity and soil water content of a Sirosa phalaris–subterranean clover pasture, North-West Slopes, New South Wales. Australian Journal of Experimental Agriculture 43(6), 539-552.
| Crossref | Google Scholar |

Mark EN, Gibson AJ, Boschma SP, Rose TJ (2025) Biostimulants do not mitigate the effects of pasture dieback in the Australian wet subtropics. Sustainability 17(7), 3013.
| Crossref | Google Scholar |

McKenna PB, Ufer N, Glenn V, Dale N, Carins T, Nguyen TH, Thomson MB, Young AJ, Buck S, Jones P, Erskine PD (2024) Mapping pasture dieback impact and recovery using an aerial imagery time series: a central Queensland case study. Crop & Pasture Science 75, CP23340.
| Crossref | Google Scholar |

Mughunth RJ, Velmurugan S, Mohanalakshmi M, Vanitha K (2024) A review of seaweed extract’s potential as a biostimulant to enhance growth and mitigate stress in horticulture crops. Scientia Horticulturae 334, 113312.
| Crossref | Google Scholar |

Parvin S, Condon J, Rose TJ (2023) Rooting depth and water use of summer cover crops in a semi-arid cropping environment. European Journal of Agronomy 147, 126847.
| Crossref | Google Scholar |

Ren X, Whitton MM, Yu SJ, Trotter T, Bajagai YS, Stanley D (2023) Application of phytogenic liquid supplementation in soil microbiome restoration in Queensland pasture dieback. Microorganisms 11, 561.
| Crossref | Google Scholar | PubMed |

Reuter RR, Moffet CA (2016) Invited review: designing a grazing experiment that can reliably detect meaningful differences. The Professional Animal Scientist 32(1), 19-30.
| Crossref | Google Scholar |

Rose MT, Patti AF, Little KR, Brown AL, Jackson WR, Cavagnaro TR (2014) Chapter two – a meta-analysis and review of plant-growth response to humic substances: practical implications for agriculture. In ‘Advances in agronomy, Vol. 124’. (Ed. DL Sparks) pp. 37–89. (Academic Press: San Diego, CA, USA) 10.1016/B978-0-12-800138-7.00002-4

Seethepalli A, Dhakal K, Griffiths M, Guo H, Freschet GT, York LM (2021) RhizoVision explorer: open-source software for root image analysis and measurement standardization. AoB PLANTS 13(6), plab056.
| Crossref | Google Scholar |

Tummers B (2006) DataThief III v.1.7. Available at http://www.datathief.org/

‘t Mannetje L (1978) Measuring quantity of grassland vegetation. In ‘Measurement of grassland vegetation and animal production’. Bulletin 52. (Ed. L ‘t Mannetje) pp. 63–95. (Commonwealth Agricultural Bureaux: Farnham Royal, UK)

’t Mannetje L, Haydock KP (2006) The dry-weight-rank method for the botanical analysis of pasture. Grass and Forage Science 18(4), 268-275.
| Crossref | Google Scholar |

Urbanowicz C, Reinke BA (2018) Publication overlap: building an academic house with salami shingles. The Bulletin of the Ecological Society of America 99(4), e01425.
| Crossref | Google Scholar |

Whitton MM, Ren X, Yu SJ, Irving AD, Trotter T, Bajagai YS, Stanley D (2022a) Sea minerals reduce dysbiosis, improve pasture productivity and plant morphometrics in pasture dieback affected soils. Sustainability 14(22), 14873.
| Crossref | Google Scholar |

Whitton MM, Ren X, Yu SJ, Trotter T, Stanley D, Bajagai YS (2022b) Remediation of pasture dieback using plant growth promotant. Agronomy 12, 3153.
| Crossref | Google Scholar |

Whitton MM, Ren X, Yu SJ, Irving AD, Trotter T, Bajagai YS, Stanley D (2023) Humate application alters microbiota–mineral interactions and assists in pasture dieback recovery. Heliyon 9(2), e13327.
| Crossref | Google Scholar |

Wilkinson MD, Dumontier M, Aalbersberg IJ, Appleton G, Axton M, Baak A, Blomberg N, Boiten J-W, da Silva Santos LB, Bourne PE, Bouwman J, Brookes AJ, Clark T, Crosas M, Dillo I, Dumon O, Edmunds S, Evelo CT, Finkers R, Gonzalez-Beltran A, Gray AJG, Groth P, Goble C, Grethe JS, Heringa J, ’t Hoen PAC, Hooft R, Kuhn T, Kok R, Kok J, Lusher SJ, Martone ME, Mons A, Packer AL, Persson B, Rocca-Serra P, Roos M, Van Schaik R, Sansone S-A, Schultes E, Sengstag T, Slater T, Strawn G, Swertz MA, Thompson M, Van der Lei J, Van Mulligen E, Velterop J, Waagmeester A, Wittenburg P, Wolstencroft K, Zhao J, Mons B (2016) The FAIR Guiding Principles for scientific data management and stewardship. Scientific Data 3, 160018.
| Crossref | Google Scholar | PubMed |