Abstract
Understanding the productivity and production risk effects of conservation tillage practices are important so that growers can make better decisions about tillage systems appropriate for their farm operations. This study investigates the mean yield and yield risk effects of conservation tillage practices with varying levels of tillage intensity and timing. Long-term field trial data for corn (Zea mays, L.) and soybeans (Glycine max, L. Merr.) in the North Carolina Piedmont, together with moment-based regression models, were used to achieve the objective of the study. Our empirical analysis suggests that conservation tillage treatments (with lower tillage intensities and higher residue levels) consistently have higher mean yields than conventional tillage practices in the sandy loam soils of the North Carolina Piedmont. However, we find that conservation tillage practices with lower intensities (and higher residue levels) do not generally have a consistent statistically significant risk reducing effect based on the higher-order moments of the yield distribution (e.g., variance, skewness, and kurtosis). This indicates that conservation tillage does not consistently result in statistically lower production risk relative to conventional tillage methods.
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Claims 2
Claim · model-written summary
Conservation tillage with lower intensity and higher residue levels consistently had higher mean yields than conventional tillage in corn and soybean trials on sandy loam soils of the North Carolina Piedmont.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- conservation tillage treatments (with lower tillage intensities and higher residue levels)e1
- Outcome
- mean yieldse1
- Direction
- highere1
- Comparator
- conventional tillage practicese1
- Setting
- sandy loam soils of the North Carolina Piedmonte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Long-term field trial data for corn (Zea mays, L.) and soybeans (Glycine max, L. Merr.)”
e1“conservation tillage treatments (with lower tillage intensities and higher residue levels) consistently have higher mean yields than conventional tillage practices in the sandy loam soils of the North Carolina Piedmont”
Claim · model-written summary
Conservation tillage with lower intensities and higher residue levels does not generally have a consistent, statistically significant effect on yield risk relative to conventional tillage in corn and soybean trials.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- conservation tillage practices with lower intensities (and higher residue levels)e2
- Outcome
- risk reducing effecte2
- Direction
- no_changeinferrede2
- Comparator
- conventional tillage methodse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Long-term field trial data for corn (Zea mays, L.) and soybeans (Glycine max, L. Merr.)”
e2“conservation tillage practices with lower intensities (and higher residue levels) do not generally have a consistent statistically significant risk reducing effect based on the higher-order moments of the yield distribution (e.g., variance, skewness, and kurtosis)”
e3“conservation tillage does not consistently result in statistically lower production risk relative to conventional tillage methods”
The same questions in other papers
tillage · yield · Zea mays (maize)Positive and negative results
811 papers in the same direction as this paper · 230 in the opposite direction · 57 reporting no difference from an alternative
- negative
- negative
- negative
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See all 1,099 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.