Abstract
Five on-farm trials were conducted in the Willamette Valley of western Oregon in 1996 to evaluate the potential for integrating winter-annual cover crops and rotary strip-tillage in vegetable productions systems. Two kinds of rotary strip tillers were used to till strips into killed winter cover crops or wheat stubble. Strip-tillage systems were compared to the “standard tillage” practices of the participating growers. In two sweet corn trials, yield of sweet corn was reduced ≈1 MT/ha in the strip-tillage treatments, compared to the standard tillage practices used by the growers. In these trials, the number of tillage operations was reduced by four to five passes with the strip-tillage system. In two other sweet corn trials, corn yield was reduced by ≈4.5 to 5.6 MT/ha in the strip-till treatments compared to the standard tillage treatments. In a transplanted broccoli trial, the strip-tillage and standard tillage treatments produced comparable yields. Possible factors reducing crop yield in the strip till systems include reduced soil temperature at planting and during early growth, soil moisture depletion in the undisturbed cover crop areas, soil compaction, nitrogen immobilization by the cover crop, weed competition, and possible glyphosate/microbiological interactions. Although an economic analysis of this project has not yet been completed, a rough estimate of tillage costs at $25/40 per pass per ha suggests that, in the field with only a 1 MT/ha yield reduction, the reduction in tillage costs would offset the yield reduction in corn (valued at about $88/MT). If yield reducing factors can be understood and a predictable, manageable system of strip-till vegetable production developed, there is a potential to dramatically reduce tillage costs and enhance soil quality through conservation of soil organic matter and biological diversity.
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Claims 5
Claim · model-written summary
Strip tillage reduced sweet corn yield by about 1 MT/ha in two trials relative to standard tillage.
Verbatim
e0“In two sweet corn trials, yield of sweet corn was reduced ≈1 MT/ha in the strip-tillage treatments, compared to the standard tillage practices used by the growers”
e1“Willamette Valley of western Oregon”
Claim · model-written summary
Strip tillage reduced the number of tillage operations by four to five passes in those trials.
- Taxon
- sweet corne1
- Treatment
- strip-tillage systeme0
- Outcome
- number of tillage operationse0
- Direction
- reducede0
- Value
- four to five passese0
Not reportedComparator
Verbatim
e0“In these trials, the number of tillage operations was reduced by four to five passes with the strip-tillage system”
e1“In two sweet corn trials”
Claim · model-written summary
In two other trials, strip tillage reduced sweet corn yield by about 4.5 to 5.6 MT/ha relative to standard tillage.
Verbatim
e0“In two other sweet corn trials, corn yield was reduced by ≈4.5 to 5.6 MT/ha in the strip-till treatments compared to the standard tillage treatments”
Claim · model-written summary
Transplanted broccoli yielded comparably under strip and standard tillage.
- Taxon
- broccoli
Brassica oleracea var. italicae0 - Treatment
- strip-tillagee0
- Outcome
- yieldse0
- Direction
- comparablee0
- Comparator
- standard tillage treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a transplanted broccoli trial, the strip-tillage and standard tillage treatments produced comparable yields”
Claim · model-written summary
Authors estimated that saved tillage costs would offset a 1 MT/ha corn yield reduction in one field.
- Taxon
- corn
Zea mays subsp. mayse0 - Outcome
- reduction in tillage costs would offset the yield reductione0
- Value
- 1 MT/hae0
- Qualifier
- about $88/MTe0
- Setting
- fielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the field with only a 1 MT/ha yield reduction, the reduction in tillage costs would offset the yield reduction in corn (valued at about $88/MT)”
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