CLAY FIXER field trial in Yarra Valley vineyard clay
At Yering Station’s Muirs vineyard, a soil pit showed major vine roots turning sideways where the topsoil met dense clay about 30–40 cm down. The question was whether improving water entry would also let roots explore the subsoil.
How the comparison worked
The initial field treatment was applied through the drip system across two irrigation zones. One zone received a second application two weeks later. A separate nearby comparison used treated and untreated vine rows. These were vineyard trial protocols. For current product rates, follow the label for your application.
What the report recorded
The technical review reported less compaction and deeper rooting in treated soil. It also reported higher late-season sodium and chloride in treated vine tissue and observed marginal leaf burn. The review found no significant improvement in yield or standard fruit-quality measures.
What this means for a grower
Check what lies beneath the compact layer before encouraging deeper rooting. Where subsoil contains salts, monitor tissue and irrigation-water quality alongside infiltration. A physical improvement alone does not establish a yield benefit.
Source: Yering Station field trial and university trial technical review, 2023 revision, version 1.9.