Abstract
Poor early growth of wheat was studied in a tillage experiment at Cowra, N.S.W., in the 1986 season to determine the involvement of soil physical and biological factors in this problem. A compaction treatment to achieve bulk density and shear strength comparable with those detected in the direct-drilled soils was imposed on the conventionally cultivated soil. Soil fumigation was used to investigate the significance of biological factors in causing poor early growth. In the absence of fumigation, the dry weight per plant 98 days after sowing for the direct-drill treatments was approximately a third of the conventional treatment. The fumigation treatment was effective in completely eliminating the poor early growth observed in the direct-drilled soils. No significant reduction in shoot growth was detected as a consequence of the compaction treatment, despite a reduction in root growth to the level detected in the nil fallow. The results suggest that poor early growth was caused by micro-organisms present in the direct-drilled soils.
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Claims 5
Claim · model-written summary
Without fumigation, direct drilled wheat had about one third the dry weight per plant of conventionally cultivated wheat at 98 days.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- direct-drill treatmentse0
- Outcome
- dry weight per plante0
- Direction
- approximately a thirde0
- Value
- a thirde0
- Qualifier
- In the absence of fumigatione0
- Comparator
- conventional treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the absence of fumigation, the dry weight per plant 98 days after sowing for the direct-drill treatments was approximately a third of the conventional treatment”
t0“wheat”
Claim · model-written summary
Fumigation eliminated poor early growth in direct drilled soils.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- fumigation treatmente0
- Outcome
- poor early growthe0
- Direction
- completely eliminatinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fumigation treatment was effective in completely eliminating the poor early growth observed in the direct-drilled soils”
t0“wheat”
Claim · model-written summary
Compaction caused no significant reduction in wheat shoot growth.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- compaction treatmente0
- Outcome
- shoot growthe0
- Direction
- No significant reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant reduction in shoot growth was detected as a consequence of the compaction treatment”
t0“wheat”
Claim · model-written summary
Compaction reduced wheat root growth to the level detected in nil fallow.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- compaction treatmente1
- Outcome
- root growthe0
- Direction
- reductione0
- Comparator
- nil fallowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“despite a reduction in root growth to the level detected in the nil fallow”
e1“as a consequence of the compaction treatment”
t0“wheat”
Claim · model-written summary
The authors infer that microorganisms in direct drilled soils caused poor early wheat growth.
- Taxon
- wheatTriticum aestivumt0
- Interactor
- micro-organismse0other
- Outcome
- poor early growthe0
- Qualifier
- present in the direct-drilled soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“poor early growth was caused by micro-organisms present in the direct-drilled soils”
t0“wheat”
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