Abstract
Gypsum was applied at 10-1 5 t/ha to white clover (Trifolium repens L.) pastures grown on three Riverine Plain soils, viz Billabong clay, Conargo sandy loam and Purdanima sandy loam that had coarse textured surface horizons of < 2.5,15 and 30 cm depth, respectively, underlain by clay subsoils. Gypsum treatment doubled growth rates where the depth of the coarse textured horizon was 15 cm or less. This was attributed to increased water entry during irrigation and higher subsoil moisture contents resulting from increased hydraulic conductivity after gypsum treatment, which were only effective where the subsoils occurred at less than 30 cm, the effective depth of water extraction by the plants. Optimum irrigation intervals for the white clover pastures were unaffected by gypsum treatment on Billabong clay and Purdanima sandy loam, where the corresponding evaporation intervals from a United States water basin class A pan were 38 mm and 51 mm, respectively. On Conargo sandy loam with 15 cm surface horizon, gypsum treatment increased the optimum irrigation interval from 37 mm to 73 mm. Gypsum treatment also halved the amount of water used to produce a unit of dry matter on Billabong clay. A critical exchangeable sodium percentage value of around 6 for the clay subsoils is indicated; above this gypsum response can be expected. For irrigated white clover pastures, subsoils need to be < 30 cm below the surface and have clay contents < 25% before significant yield increases to gypsum can be expected.
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Claims 8
Claim · model-written summary
Gypsum doubled clover growth rates where the coarse surface horizon was 15 cm or less.
- Taxon
- white clover
Trifolium repenst0 - Treatment
- Gypsum treatmente0
- Outcome
- growth ratese0
- Direction
- doublede0
- Value
- 15 cm or lesse0
- Qualifier
- coarse textured horizone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gypsum treatment doubled growth rates where the depth of the coarse textured horizon was 15 cm or less.”
t0“white clover (Trifolium repens L.) pastures”
Claim · model-written summary
Gypsum increased water entry during irrigation.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- gypsum treatmente0
- Outcome
- water entry during irrigatione0
- Qualifier
- increased hydraulic conductivitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was attributed to increased water entry during irrigation and higher subsoil moisture contents resulting from increased hydraulic conductivity after gypsum treatment”
t0“white clover (Trifolium repens L.) pastures”
Claim · model-written summary
Gypsum increased subsoil moisture contents.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- gypsum treatmente0
- Outcome
- subsoil moisture contentse0
- Qualifier
- increased hydraulic conductivitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher subsoil moisture contents resulting from increased hydraulic conductivity after gypsum treatment”
t0“white clover (Trifolium repens L.) pastures”
Claim · model-written summary
Gypsum did not change optimum irrigation intervals on Billabong clay or Purdanima sandy loam.
- Taxon
- white cloverTrifolium repense0
- Treatment
- gypsum treatmente0
- Outcome
- Optimum irrigation intervalse0
- Direction
- unaffectede0
- Setting
- Billabong clay and Purdanima sandy loame0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum irrigation intervals for the white clover pastures were unaffected by gypsum treatment on Billabong clay and Purdanima sandy loam, where the corresponding evaporation intervals from a United States water basin class A pan were 38 mm and 51 mm, respectively.”
Claim · model-written summary
Gypsum increased the optimum irrigation interval on Conargo sandy loam from 37 to 73 mm.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- gypsum treatmente0
- Outcome
- optimum irrigation intervale0
- Direction
- increasede0
- Value
- 73 mme0
- Qualifier
- from 37 mme0
- Setting
- Conargo sandy loame0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On Conargo sandy loam with 15 cm surface horizon, gypsum treatment increased the optimum irrigation interval from 37 mm to 73 mm.”
t0“white clover (Trifolium repens L.) pastures”
Claim · model-written summary
Gypsum halved water use per unit of dry matter on Billabong clay.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- Gypsum treatmente0
- Outcome
- amount of water used to produce a unit of dry mattere0
- Direction
- halvede0
- Setting
- Billabong claye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gypsum treatment also halved the amount of water used to produce a unit of dry matter on Billabong clay.”
t0“white clover (Trifolium repens L.) pastures”
Claim · model-written summary
A clay-subsoil exchangeable sodium percentage around 6 was identified as a threshold for gypsum response.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- gypsum responsee0
- Value
- around 6e0
- Qualifier
- clay subsoilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A critical exchangeable sodium percentage value of around 6 for the clay subsoils is indicated; above this gypsum response can be expected.”
t0“white clover (Trifolium repens L.) pastures”
Claim · model-written summary
The authors indicate that subsoils must be under 30 cm deep and have under 25% clay for significant clover yield gains from gypsum.
- Taxon
- white cloverTrifolium repense0
- Outcome
- significant yield increases to gypsume0
- Qualifier
- subsoils need to be < 30 cm below the surface and have clay contents < 25%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For irrigated white clover pastures, subsoils need to be < 30 cm below the surface and have clay contents < 25% before significant yield increases to gypsum can be expected.”
The same questions in other papers
lime · growth · Trifolium repens (white clover)Results differ
9 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- no effect
- no effect
10 papers more in this group
See all 14 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.