Abstract
We evaluated on sandplain soils in the northern wheatbelt of Western Australia in 1990 and 1991 the effect on wheat yields (Triticum aestivum) of increasing the depth of soil disturbance (4-40 cm) while direct drilling. These sandplain soils are easily compacted and eroded by wind, but yields after direct drilling with tined implements are frequently poorer than yields after cultivation. Direct drilling with a tined seeder was compared with: (i) direct drilling with a modified seeder on which the front 3 rows of cultivating tines could be lowered relative to the rear 3 rows of seeding tines; and (ii) with direct drilling followed immediately by deep ripping. Progressively increasing the depth of disturbance reduced soil strength and generally increased grain yields of wheat. Effects on yield were more pronounced in the wetter year of 1991 on an experimental site that had not been previously ripped; responses of 32 kg/ha for each centimetre increase in depth of disturbance were recorded. The highest yields followed deep ripping (3429 kg/ha), and the lowest yields followed minimal soil disturbance using narrow (5 cm) seeding tines working to seeding depth only (2144 kg/ha). These results confirmed that it is possible to use a modified direct drilling technique (thus retaining the advantages of timely sowing after rainfall and lowered risk of wind erosion) and raise yields above those normally expected from direct drilling on these soils.
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Claims 6
Claim · model-written summary
Increasing disturbance depth reduced soil strength.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- increasing the depth of disturbancee0
- Outcome
- soil strengthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Progressively increasing the depth of disturbance reduced soil strength and generally increased grain yields of wheat.”
Claim · model-written summary
Increasing disturbance depth generally increased wheat grain yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- increasing the depth of disturbancee0
- Outcome
- grain yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Progressively increasing the depth of disturbance reduced soil strength and generally increased grain yields of wheat.”
Claim · model-written summary
Yield response was more pronounced in wetter 1991 at a previously unripped site.
- Outcome
- Effects on yielde0
- Direction
- more pronouncede0
- Value
- 32 kg/ha for each centimetree0
- Qualifier
- wetter year of 1991 on an experimental site that had not been previously rippede0
Not reportedTaxon
Verbatim
e0“Effects on yield were more pronounced in the wetter year of 1991 on an experimental site that had not been previously ripped; responses of 32 kg/ha for each centimetre increase in depth of disturbance were recorded.”
t0“wheat”
Claim · model-written summary
Deep ripping produced the highest yield, 3429 kg/ha.
- Treatment
- deep rippinge0
- Outcome
- yieldse0
- Direction
- higheste0
- Value
- 3429 kg/hae0
- Comparator
- minimal soil disturbancee0
Not reportedTaxon
Verbatim
e0“The highest yields followed deep ripping (3429 kg/ha), and the lowest yields followed minimal soil disturbance using narrow (5 cm) seeding tines working to seeding depth only (2144 kg/ha).”
t0“wheat”
Claim · model-written summary
Minimal soil disturbance produced the lowest yield, 2144 kg/ha.
- Treatment
- minimal soil disturbance using narrow (5 cm) seeding tinese0
- Outcome
- yieldse0
- Direction
- loweste0
- Value
- 2144 kg/hae0
- Comparator
- deep rippinge0
Not reportedTaxon
Verbatim
e0“The highest yields followed deep ripping (3429 kg/ha), and the lowest yields followed minimal soil disturbance using narrow (5 cm) seeding tines working to seeding depth only (2144 kg/ha).”
t0“wheat”
Claim · model-written summary
Modified direct drilling can raise yields above those normally expected from direct drilling.
- Treatment
- modified direct drilling techniquee0
- Outcome
- raise yields above those normally expected from direct drillinge0
Not reportedTaxon
Verbatim
e0“it is possible to use a modified direct drilling technique (thus retaining the advantages of timely sowing after rainfall and lowered risk of wind erosion) and raise yields above those normally expected from direct drilling on these soils”
t0“wheat”
The same questions in other papers
soil · yield · Triticum aestivum (wheat)Positive and negative results
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- positive
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See all 20 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.