Abstract
Abstract In an effort to minimize tillage operations and production costs five sweep tillage intervals were evaluated for 7 years during the two 11‐month fallow periods in a winter wheat ( Triticum aestivum L. ‘Tascosa’)‐sorghum ( Sorghum bicolor (L.) Moench) cropping sequence. The tillage intervals ranged from very short or once every 2 weeks to as long as 24 days after weed emergence. Their effect on soil water storage, soil NO 3 ‐N level and crop yield were determined on Pullman clay loam in the Southern Great Plains. Delaying tillage for 17 and 24 days after weed emergence reduced available soil water in the top 120 cm of soil. Average NO a ‐N content in the top 120 cm of soil decreased from over 185 kg/ha with sweep tillage at 2‐week intervals to 56 kg/ha when sweep tillage was delayed until 24 days after weed emergence. Average wheat yields were not reduced when sweep tillage was performed 17 days after weed emergence, however they were reduced when tillage was delayed until 24 days after weed emergence. Average sorghum yields were not reduced when tillage was delayed 10 days after weed emergence. Delaying tillage to 17 days after weed emergence cut sorghum yield. Most farmers till about 4 to 10 days after weed emergence. Delaying tillage as much as possible as indicated in this trial will eliminate on or two tillage operations in an 11‐month fallow period.
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Claims 5
Claim · model-written summary
Tillage delayed 17 or 24 days reduced available soil water.
- Treatment
- Delaying tillage for 17 and 24 days after weed emergencee0
- Outcome
- available soil watere0
- Direction
- reducede0
Not reportedTaxonComparator
Verbatim
e0“Delaying tillage for 17 and 24 days after weed emergence reduced available soil water in the top 120 cm of soil”
Claim · model-written summary
Soil nitrate fell from over 185 to 56 kg/ha when tillage was delayed 24 days.
- Treatment
- sweep tillage was delayed until 24 days after weed emergencee0
- Outcome
- Average NO a ‐N contente0
- Direction
- decreasede0
- Value
- 56 kg/hae0
- Qualifier
- over 185 kg/hae0
- Comparator
- sweep tillage at 2‐week intervalse0
Not reportedTaxon
Verbatim
e0“Average NO a ‐N content in the top 120 cm of soil decreased from over 185 kg/ha with sweep tillage at 2‐week intervals to 56 kg/ha when sweep tillage was delayed until 24 days after weed emergence”
Claim · model-written summary
Wheat yield was not reduced by tillage at 17 days.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- sweep tillage was performed 17 days after weed emergencee0
- Outcome
- wheat yieldse0
- Direction
- not reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average wheat yields were not reduced when sweep tillage was performed 17 days after weed emergence”
Claim · model-written summary
Sorghum yield was not reduced by tillage delayed 10 days.
- Treatment
- tillage was delayed 10 days after weed emergencee0
- Outcome
- sorghum yieldse0
- Direction
- not reducede0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average sorghum yields were not reduced when tillage was delayed 10 days after weed emergence”
Claim · model-written summary
Sorghum yield fell with tillage delayed 17 days.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delaying tillage to 17 days after weed emergence cut sorghum yield”
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