Effects of gypsum and legumes on soil pH and soil organic C - Exp 1


Research organisatons
Funding source

Trial details

Researcher(s) Ehsan Tavakkoli (ex UoA), Suzanne Holbery (ex SARDI), Ian Richter (SARDI), Roy Latta (ex SARDI), Pichu Rengasamy and Glenn McDonald (UoA)
Year(s) 2014
Contributor SARDI Minnipa Agricultural Centre
Trial location(s) Site 22, Minnipa Agricultural Centre, SA
Effects of gypsum and legumes on soil pH and soil organic C - Exp 1 locations

To examine the effect of gypsum on soil pH and soil C and whether changes in soil pH could alter productivity of the following cereal crops.

Key messages

Applying gypsum can reduce soil pH and lower the concentration of dissolved organic carbon (C) to 30 cm depth within a year. Soils with pH > 9 will benefit most from gypsum. The solubilisation of soil organic C increased markedly at pH above 8.5. The availability of aluminium (Al) in soil increases at pH above 9. There was no significant effect of gypsum on the biomass or yields of crops within 2 years.

Lead research organisation University of Adelaide
Host research organisation SARDI Minnipa Agricultural Centre
Trial funding source DAWR 1203.014
Related program National Soil Carbon Program

The work was funded by the Australian Department of Agriculture through the Filling the Research Gap under National Soil Carbon Program

Other trial partners Not specified
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Crop type Barley
Treatment type(s)
  • Fungicide: Rate
  • Soil amelioration: Type
Trial type Experimental
Trial design Replicated

Minnipa Agricultural Centre 2014

Sow date Not specified
Harvest date Not specified
Plot size 34m x 2m
Plot replication 3
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Download results

Trial results Table 1

# Variety
Treatment 1
Grain yield (t/ha) pH 10-20cm (pH) pH 0-10cm (pH) pH 20-30cm (pH)
1 Barley:ScopeCL Gypsum rate 0 t/ha 2.78 8.86 8.48 9.03
1 Barley:ScopeCL Gypsum rate 2.5 t/ha 2.85 8.4 8.3 8.74
2 Barley:ScopeCL Gypsum rate 5 t/ha 2.81 8.45 8.26 8.68
2 Barley:ScopeCL
3 Barley:ScopeCL
3 Barley:ScopeCL

Grain yield t/ha


pH 0-10cm pH


pH 10-20cm pH


pH 20-30cm pH

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 22, Minnipa Agricultural Centre, SA Red loam
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 22, Minnipa Agricultural Centre, SA Calcarosol
National soil grid Source
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties



Site 22, Minnipa Agricultural Centre SA 2014

Observed climate information

Rainfall trial gsr (mm) 290mm

Derived climate information

Site 22, Minnipa Agricultural Centre SA


Some data on this site is sourced from the Bureau of Meteorology

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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Trial last modified: 10-09-2019 15:17pm AEST