Chad Reynolds (DAFWA) Christine Zaicou-Kunesch (DAFWA)
West Midlands Group
Regans Ford, WA
To identify impact of amelioration on maintaining productivity of adapted varieties in a district.
To compare effect of amelioration on soil pH.
Liming and spading had a significant effect on soil pH. The untreated plots (no spading and no lime) had a soil pH that declined from 5.5 to 4.3 down the soil profile. Simply spading the soil, without lime application, lowered the soil pH of the topsoil to because acidic subsoil is mixed with the top soil. Liming, without spading, has significantly increased pH levels on topsoil to 5.8 but no effect at depth. Liming together with spading has improved the soil pH at depth.
Due to variability at seeding and weed control the impact of soil amelioration on productivity of the wheat varieties is not conclusive (CV = 16%). Liming (averaged across variety and spading), reduced yield from 3.2 t/ha to 2.9 t/ha (p=0.009, LSD =0.2). Spading treatments affected seeding depth. This resulted in variable and poor emergence in the spaded treatments. Wheat plant densities established were 85 plants / m2 in the spaded treatment and 105 plants / m2 in the un- spaded treatment. Brome grass control was not highly effective and variable across the site. These factors will have influenced the large variability in treatment effects. However future cropping across the trial area may indicate the treatment effects.
Corack and Mace were significantly higher yielding than Emu Rock, however black point is a risk factor for Corack. The other varieties performed similarly.
Spading treatments were carried out within a short period prior to seeding and plots were not rolled. This will have had a large influence on the variability of grain yield at the site. To improve future trial research liming and spading need to be carried earlier in the year for soil to settle before seeding or roll soil after spading to prevent machinery from sinking in soft soil.
Lead research organisation
Department of Agriculture and Food WA
Host research organisation
West Midlands Group
Trial funding source
Acknowledge West Midlands Group for support with trial planning and extension opportunities, Peter Negus and Family for access to the property, Joel Andrew from Precision SoilTech for soil sampling and pH testing, Anne Smith, Jo Walker, Steve Smith and Trevor Bell, Technical Services Team, DAFWA for excellent technical support.
Trial source data and summary not available Check the trial report PDF for trial results.
Regans Ford WA 2013
Observed climate information
Rainfall trial gsr (mm)
Derived climate information
Regans Ford WA
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.
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