Abstract
Subsurface drip irrigation and conservation tillage are tools for improving water management for cotton (Gossypium hirsutum). In previous research with cotton grown with no tillage over subsurface drip laterals, excessive soil compaction near the soil surface occurred. We hypothesized that loosening this compacted surface soil could improve cotton productivity. We tested this hypothesis by conducting a 2-year (1998 and 1999) field experiment on a Eunola loamy sand (Aquic Hapludults) in South Carolina, USA, to determine the effect of three levels of soil loosening (no tillage, shallow in-row tillage with a rigid shank, and shallow tillage with a stubble mulch plough to loosen the entire surface layer of soil) and two drip lateral spacings (under every row and in every other row middle; 1-m and 2-m spacings, respectively) on early-season physiological parameters and productivity of cotton. The subsurface drip irrigation system had been used for 7 years before initiating this experiment. Early-season cotton leaf gas exchange, leaf nutrient concentrations, yield, and fibre quality were measured. The tillage implements loosened the soil as expected (as determined with a cone penetrometer), but the level of soil loosening had almost no effect on leaf gas exchange and leaf nutrient status. Similarly, tillage and lateral spacing did not affect cotton yield and quality. Yields were not high (mean yield of 1215 kg/ha in 1998 and 700 kg/ha in 1999) but were not atypical for irrigated yields in this region during those years. Conservation tillage methods that include shallow tillage over drip laterals on compacted southeast coastal plain soils did not improve cotton productivity.
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Claims 6
Claim · model-written summary
The tillage implements loosened the soil as expected.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- tillage implementse0
- Outcome
- soile0
- Direction
- loosenede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tillage implements loosened the soil as expected (as determined with a cone penetrometer)”
t0“cotton”
Claim · model-written summary
Soil loosening had almost no effect on cotton leaf gas exchange and nutrient status.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- level of soil looseninge0
- Outcome
- leaf gas exchange and leaf nutrient statuse0
- Direction
- almost no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of soil loosening had almost no effect on leaf gas exchange and leaf nutrient status.”
t0“cotton”
Claim · model-written summary
Tillage and lateral spacing did not affect cotton yield and quality.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- tillage and lateral spacinge0
- Outcome
- cotton yield and qualitye0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tillage and lateral spacing did not affect cotton yield and quality.”
Claim · model-written summary
Mean cotton yield in 1998 was 1215 kg/ha.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mean yield of 1215 kg/ha in 1998 and 700 kg/ha in 1999”
t0“cotton”
e1“Yields were not high (mean yield of 1215 kg/ha in 1998 and 700 kg/ha in 1999)”
Claim · model-written summary
Mean cotton yield in 1999 was 700 kg/ha.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were not high (mean yield of 1215 kg/ha in 1998 and 700 kg/ha in 1999)”
t0“cotton”
Claim · model-written summary
The authors conclude shallow tillage over drip laterals on compacted coastal plain soils did not improve cotton productivity.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- did not improve cotton productivitye0
- Direction
- did not improvee0
- Setting
- southeast coastal plain soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conservation tillage methods that include shallow tillage over drip laterals on compacted southeast coastal plain soils did not improve cotton productivity.”
The same questions in other papers
density · quality: general · Gossypium hirsutum (cotton)Positive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
3 papers more in this group
See all 7 papers →tillage · quality: general · Gossypium hirsutum (cotton)Results agree
1 paper in the same direction as this paper
- no effect
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.