Abstract
Tillage and N management systems can have a significant effect on N use by corn ( Zea mays L.) and nitrate (NO 3 –N) movement through the soil profile. Potential water quality and NO 3 –N loss problems associated with conventional tillage and fall‐applied N have prompted this study. The objective is to evaluate strip tillage effect on corn N uptake and NO 3 –N movement through the soil profile compared with chisel plow and no‐tillage systems. The three tillage systems implemented in this study were strip tillage, no‐tillage, and chisel plow along with two N application timings (fall and spring) of 170 kg N ha −1 for corn in a corn–soybean [ Glycine max (L.) Merr.] rotation on two Iowa fields in 2001 and 2002. The three tillage systems were implemented every year for both crops (corn and soybean). Crop response, N uptake, and other soil NO 3 –N measurements were conducted on a randomized complete block design experiment. Grain yields and grain N uptake showed no significant improvement under strip tillage compared with no‐tillage or chisel plow systems. Tillage and N treatments caused no significant differences in NO 3 –N accumulation at the lower depths of the root zone (1.2 m). Strip tillage and no‐tillage resulted in lower residual soil NO 3 –N buildup than chisel plow in the 0‐ to 1.2‐m soil profile after 2 yr of tillage implementation. Tillage and N treatments did not cause significant differences in NO 3 –N concentration in water leachate collected at the 1.2‐m depth.
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Claims 5
Claim · model-written summary
Strip tillage did not significantly improve corn grain yield relative to no tillage or chisel plow.
- Treatment
- strip tillagee0
- Outcome
- Grain yieldse0
- Direction
- no significant improvemente0
- Comparator
- no‐tillage or chisel plow systemse0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields and grain N uptake showed no significant improvement under strip tillage compared with no‐tillage or chisel plow systems.”
t0“corn ( Zea mays L.)”
Claim · model-written summary
Strip tillage did not significantly improve corn grain nitrogen uptake relative to no tillage or chisel plow.
- Treatment
- strip tillagee0
- Outcome
- grain N uptakee0
- Direction
- no significant improvemente0
- Comparator
- no‐tillage or chisel plow systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields and grain N uptake showed no significant improvement under strip tillage compared with no‐tillage or chisel plow systems.”
t0“corn ( Zea mays L.)”
Claim · model-written summary
Tillage and nitrogen treatments did not significantly change nitrate accumulation at lower root-zone depths.
- Treatment
- Tillage and N treatmentse0
- Outcome
- NO 3 –N accumulatione0
- Direction
- no significant differencese0
- Qualifier
- lower depths of the root zone (1.2 m)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage and N treatments caused no significant differences in NO 3 –N accumulation at the lower depths of the root zone (1.2 m).”
t0“corn ( Zea mays L.)”
Claim · model-written summary
Strip tillage and no tillage left less residual soil nitrate than chisel plow after two years.
- Treatment
- Strip tillage and no‐tillagee0
- Outcome
- residual soil NO 3 –N buildupe0
- Direction
- lowere0
- Qualifier
- after 2 yr of tillage implementatione0
- Comparator
- chisel plowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strip tillage and no‐tillage resulted in lower residual soil NO 3 –N buildup than chisel plow in the 0‐ to 1.2‐m soil profile after 2 yr of tillage implementation.”
t0“corn ( Zea mays L.)”
Claim · model-written summary
Tillage and nitrogen treatments caused no significant difference in leachate nitrate concentration.
- Treatment
- Tillage and N treatmentse0
- Outcome
- NO 3 –N concentration in water leachatee0
- Direction
- did not cause significant differencese0
- Qualifier
- 1.2‐m depthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage and N treatments did not cause significant differences in NO 3 –N concentration in water leachate collected at the 1.2‐m depth.”
t0“corn ( Zea mays L.)”
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