Novel rock mineral fertiliser application with microbial consortium inoculant enhances growth, yield and grain protein content of wheat (Triticum aestivum L.) in sandy soil

ABSTRACT

Grain yield and protein concentration are critical traits determining wheat economic value and are dependent on nitrogen (N) supply and crop N status. However, application of N fertilisers is costly and has a large environmental footprint. We assessed the effect of slow-release rock mineral fertiliser (RMF) with or without microbial consortium inoculant (MI) on growth, grain yield and protein content of winter wheat grown in a low-fertility soil. The experiment was set up with three factors [RMF rates (0, 10 and 20 mg N kg⁻¹ soil), MI (with and without) and two wheat genotypes] replicated four times and harvested twice (anthesis and maturity). The addition of MI increased root biomass at anthesis, but there was no effect at maturity. The shoot and grain nutrient content and protein yield were highest in plants treated with 20 mg N kg⁻¹ soil. The plants treated with MI resulted in lower grain protein concentration than without MI. Arbuscular mycorrhizal (AM) colonisation was higher in treatment with than without MI. The application of RMF at 20 mg N kg⁻¹ soil produced higher plant growth, nutrient content, grain and protein yield compared to control in nutrient-poor sandy soil.

KEYWORDS:

• Grain protein concentration
• grain protein yield
• slow-release rock mineral fertiliser
• microbial consortium inoculant

Acknowledgements

The first author was supported through the Australian Government Research Training Program Fee Offset Scholarship and the University Postgraduate Award by The University of Western Australia, Perth, Australia. Troforte Innovations Pty Ltd, Wangara, WA 6065, Australia, supplied the microbial consortium inoculant and polymer-coated rock mineral fertiliser.

Disclosure statement

No potential conflict of interest was reported by the author(s).