Abstract
Previous research in the mid-Atlantic and midwestern USA has identified advantages and drawbacks of "organic no-till" vegetable production, but few studies have been conducted in the warmer southeastern region. The purpose of this study was to examine the effects of tillage [no-till (NT) vs. conventional tillage (CT) of a cereal rye/crimson clover cover crop] and three nitrogen fertilization rates on organic tomato (Solanum lycopersicum L.) and summer squash (Cucurbita pepo L.) yield, weed suppression, and soil N dynamics in two years in a soil series in Clemson, SC. Squash yields were similar between tillage treatments in both years. NT tomato yields were 43% greater than CT yields in 2014, whereas CT tomato yields were 46% greater than NT yields in 2015. Squash and tomato yields per unit of management labor (time) were significantly greater in NT compared to CT treatments for both years. There were no statistical differences in squash and tomato yields between N fertilization treatments in either year. Pre-season soil N levels were significantly higher in NT tomato plots in 2014 but similar between tillage treatments in tomato plots in 2015 and in squash plots both years. Post-season soil N levels in tomato plots were similar between tillage treatments both years. Post-season soil N levels were significantly higher in NT squash plots in 2014 and in CT squash plots in 2015. Roller-crimped NT mulches provided adequate early-season weed suppression in both years and saved considerable weed management and seedbed preparation labor. Overall, the results demonstrated that organic no-till is a viable method for reduced tillage summer vegetable production in the South Carolina Piedmont region.
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Claims 15
Claim · model-written summary
Squash yields were similar under no-till and conventional tillage in both years.
Not reportedComparator
Verbatim
e0“Squash yields were similar between tillage treatments in both years.”
Claim · model-written summary
No-till tomato yield exceeded conventional tillage by 43% in 2014.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- NTe0
- Outcome
- yieldse0
- Direction
- greatere0
- Value
- 43%e0
- Qualifier
- 2014e0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NT tomato yields were 43% greater than CT yields in 2014”
Claim · model-written summary
Conventional tillage tomato yield exceeded no-till by 46% in 2015.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- CTe0
- Outcome
- yieldse0
- Direction
- greatere0
- Value
- 46%e0
- Qualifier
- 2015e0
- Comparator
- NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT tomato yields were 46% greater than NT yields in 2015.”
Claim · model-written summary
Squash yield per management labor was significantly higher under no-till.
Verbatim
e0“Squash and tomato yields per unit of management labor (time) were significantly greater in NT compared to CT treatments for both years.”
Claim · model-written summary
Tomato yield per management labor was significantly higher under no-till.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- NTe0
- Outcome
- yields per unit of management labor (time)e0
- Direction
- greatere0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Squash and tomato yields per unit of management labor (time) were significantly greater in NT compared to CT treatments for both years.”
Claim · model-written summary
Nitrogen fertilization rates did not significantly differ for squash yield.
- Taxon
- squashe0
- Treatment
- N fertilization treatmentse0
- Outcome
- yieldse0
- Direction
- no statistical differencese0
Not reportedComparator
Verbatim
e0“There were no statistical differences in squash and tomato yields between N fertilization treatments in either year.”
Claim · model-written summary
Nitrogen fertilization rates did not significantly differ for tomato yield.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- N fertilization treatmentse0
- Outcome
- yieldse0
- Direction
- no statistical differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no statistical differences in squash and tomato yields between N fertilization treatments in either year.”
Claim · model-written summary
Pre-season soil nitrogen was higher in no-till tomato plots in 2014.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- NTe0
- Outcome
- Pre-season soil N levelse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pre-season soil N levels were significantly higher in NT tomato plots in 2014”
Claim · model-written summary
Pre-season soil nitrogen was similar between tillage treatments in tomato plots in 2015 and squash plots both years.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- tillage treatmentse0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“similar between tillage treatments in tomato plots in 2015 and in squash plots both years.”
Claim · model-written summary
Post-season soil nitrogen in tomato plots was similar between tillage treatments.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- tillage treatmentse0
- Outcome
- Post-season soil N levelse0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Post-season soil N levels in tomato plots were similar between tillage treatments both years.”
Claim · model-written summary
Post-season soil nitrogen was higher in no-till squash plots in 2014.
Not reportedComparator
Verbatim
e0“Post-season soil N levels were significantly higher in NT squash plots in 2014”
Claim · model-written summary
Post-season soil nitrogen was higher in conventional tillage squash plots in 2015.
Verbatim
e0“Post-season soil N levels were significantly higher in NT squash plots in 2014 and in CT squash plots in 2015.”
Claim · model-written summary
Roller-crimped no-till mulches adequately suppressed early-season weeds.
Not reportedTaxonComparatorDirection
Verbatim
e0“Roller-crimped NT mulches provided adequate early-season weed suppression in both years”
Claim · model-written summary
Roller-crimped no-till mulches saved weed management and seedbed preparation labor.
- Treatment
- Roller-crimped NT mulchese0
- Outcome
- weed management and seedbed preparation labore0
- Direction
- savede0
Not reportedTaxonComparator
Verbatim
e0“Roller-crimped NT mulches provided adequate early-season weed suppression in both years and saved considerable weed management and seedbed preparation labor.”
Claim · model-written summary
Organic no-till is viable for reduced tillage vegetable production in South Carolina Piedmont.
Verbatim
e0“organic no-till is a viable method for reduced tillage summer vegetable production in the South Carolina Piedmont region.”
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