Abstract
In Spring 1998, two sweet corn ( Zea mays var. rugosa ) cultivars were grown under three tillage systems, conventional cultivation, ridge tillage (RT), and no tillage (NT), which had been in continuous management since Fall 1994. Nitrogen (as NH 4 NO 3 ), the only fertilizer used, was applied twice at 60 kg/ha. Sweet corn yields were not influenced by tillage system, but average ear weights tended to be smaller under NT ( P < 0.17). Ear quality attributes, which included ear weight, length, diameter, dry matter, and incidence of earworm damage, were greater in the later-maturing `G-90' cultivar than in `Sensor'; but tillage system had no influence on these attributes. Cultivars supported different weed species underneath their canopies. `Sensor' allowed more light penetration and sustained higher weed biomass than did the taller `G-90' plants. Weed biomass was higher under RT and NT. Seasonal soil moisture was lowest in the RT plots, but only in the 0- to 15-cm profile. Soil temperatures (unreplicated) at the 15-cm depth were similar between cultivars and tillage treatments over the growing season. The earlier-maturing `Sensor' generally accumulated more ear mineral nutrients (P, S, NO 3 , Ca, Na, Zn, Mn, Al, and B; dry weight basis), but had lower dry matter (percentage) than did `G-90'. Cumulative nutrient levels tended to be lowest in NT-grown ears ( P < 0.08). Soil sampled at 0- to 5-, 10- to 15-, and 25- to 30-cm depths generally had higher concentrations of nutrients toward the surface, and NT soils had the steepest nutrient gradients, with the exception of Na and NO 3 . Total soil salts were reduced by RT and NT, but C: N ratio remained unchanged between tillage systems.
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Claims 16
Claim · model-written summary
Sweet corn yield was not influenced by tillage system.
Not reportedComparator
Verbatim
e0“Sweet corn yields were not influenced by tillage system”
Claim · model-written summary
Ear weights tended to be smaller under no tillage.
Not reportedComparator
Verbatim
e0“average ear weights tended to be smaller under NT ( P < 0.17)”
t0“Sweet Corn”
Claim · model-written summary
The G-90 cultivar had greater ear quality attributes than Sensor.
- Taxon
- sweet cornt0
- Material
- `G-90'e0
- Interactor
- earworme0pest
- Outcome
- Ear quality attributese0
- Direction
- greatere0
- Comparator
- `Sensor'e0
Not reportedTreatment
Verbatim
e0“Ear quality attributes, which included ear weight, length, diameter, dry matter, and incidence of earworm damage, were greater in the later-maturing `G-90' cultivar than in `Sensor'”
t0“Sweet Corn”
Claim · model-written summary
Tillage did not influence ear quality attributes.
Not reportedComparator
Verbatim
e0“tillage system had no influence on these attributes”
t0“Sweet Corn”
Claim · model-written summary
Sensor supported greater weed biomass than G-90.
Verbatim
e0“`Sensor' allowed more light penetration and sustained higher weed biomass than did the taller `G-90' plants”
t0“Sweet Corn”
Claim · model-written summary
Sensor allowed more light penetration than G-90.
Verbatim
e0“`Sensor' allowed more light penetration and sustained higher weed biomass than did the taller `G-90' plants”
t0“Sweet Corn”
Claim · model-written summary
Weed biomass was higher under ridge tillage and no tillage.
Not reportedComparator
Verbatim
e0“Weed biomass was higher under RT and NT”
t0“Sweet Corn”
Claim · model-written summary
Seasonal soil moisture was lowest in ridge tillage plots at 0 to 15 cm.
- Taxon
- sweet cornt0
- Treatment
- RTe0
- Outcome
- Seasonal soil moisturee0
- Direction
- loweste0
- Qualifier
- 0- to 15-cm profilee0
Not reportedComparator
Verbatim
e0“Seasonal soil moisture was lowest in the RT plots, but only in the 0- to 15-cm profile”
t0“Sweet Corn”
Claim · model-written summary
Soil temperatures were similar across cultivars and tillage treatments.
Verbatim
e0“Soil temperatures (unreplicated) at the 15-cm depth were similar between cultivars and tillage treatments over the growing season”
t0“Sweet Corn”
Claim · model-written summary
Sensor accumulated more ear mineral nutrients than G-90.
Verbatim
e0“The earlier-maturing `Sensor' generally accumulated more ear mineral nutrients (P, S, NO 3 , Ca, Na, Zn, Mn, Al, and B; dry weight basis), but had lower dry matter (percentage) than did `G-90'”
t0“Sweet Corn”
Claim · model-written summary
Sensor ears had lower dry matter percentage than G-90.
Verbatim
e0“The earlier-maturing `Sensor' generally accumulated more ear mineral nutrients (P, S, NO 3 , Ca, Na, Zn, Mn, Al, and B; dry weight basis), but had lower dry matter (percentage) than did `G-90'”
t0“Sweet Corn”
Claim · model-written summary
Ear nutrient levels tended to be lowest under no tillage.
- Taxon
- sweet cornt0
- Treatment
- NT-growne0
- Outcome
- Cumulative nutrient levelse0
- Direction
- loweste0
- Qualifier
- P < 0.08e0
Not reportedComparator
Verbatim
e0“Cumulative nutrient levels tended to be lowest in NT-grown ears ( P < 0.08)”
t0“Sweet Corn”
Claim · model-written summary
Soil nutrients were generally more concentrated near the surface.
Verbatim
e0“generally had higher concentrations of nutrients toward the surface”
t0“Sweet Corn”
Claim · model-written summary
No tillage soils had the steepest nutrient gradients except for Na and NO 3.
- Taxon
- sweet cornt0
- Treatment
- NTe0
- Outcome
- nutrient gradientse0
- Direction
- steepeste0
- Qualifier
- with the exception of Na and NO 3e0
Not reportedComparator
Verbatim
e0“NT soils had the steepest nutrient gradients, with the exception of Na and NO 3”
t0“Sweet Corn”
Claim · model-written summary
Ridge and no tillage reduced total soil salts.
Not reportedComparator
Verbatim
e0“Total soil salts were reduced by RT and NT”
t0“Sweet Corn”
Claim · model-written summary
Soil C:N ratio was unchanged among tillage systems.
Not reportedComparator
Verbatim
e0“C: N ratio remained unchanged between tillage systems”
t0“Sweet Corn”
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