Abstract
Abstract Corn ( Zea mays L.) stover demand as a forage or for an emerging bioeconomy has increased the importance of determining the long‐term effects of stover removal on grain yield and soil properties. Study objectives were to evaluate grain yield, soil organic carbon (SOC), and total soil N (0–150 cm) in a 20‐year, irrigated, continuous corn study, located in eastern Nebraska, under conventional tillage (CT) and no‐till (NT) with variable corn stover removal rates (none, medium, and high). After 20 years, grain yield was up to 6.0% greater under NT with stover removal compared with NT and no stover removal, while yield was similar for CT in all stover removal treatments. Grain yield was similar between NT with stover removal and CT in all stover removal treatments. High stover removal rates resulted in greater SOC loss at the surface soil layers (0–15 cm and 0–30 cm) after 20 years compared with no or medium stover removal. Corn stover retention under NT resulted in the same cumulative SOC stock loss as CT or stover removal. All management practices resulted in cumulative (0–120 cm) SOC stock loss (8% decrease) that occurred in the last 10 years of the study. Total soil nitrogen stocks were maintained or increased after 20 years at the surface soil layers (0–15 cm and 0–30 cm) and were similar between NT and CT. In an irrigated continuous corn system, neither NT nor stover retention was able to maintain cumulative SOC stocks over time.
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Claims 8
Claim · model-written summary
No-till with stover removal increased corn grain yield by up to 6.0% versus no-till without removal.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- NT with stover removale0
- Outcome
- grain yielde0
- Direction
- greatere0
- Value
- 6.0%e0
- Comparator
- NT and no stover removale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield was up to 6.0% greater under NT with stover removal compared with NT and no stover removal”
t0“Corn”
Claim · model-written summary
Conventional tillage grain yield was similar across stover removal treatments.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- stover removal treatmentse0
- Outcome
- yielde0
- Direction
- similare0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield was similar for CT in all stover removal treatments”
t0“Corn”
Claim · model-written summary
Grain yield was similar between no-till with stover removal and conventional tillage treatments.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- NT with stover removale0
- Outcome
- Grain yielde0
- Direction
- similare0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield was similar between NT with stover removal and CT in all stover removal treatments”
t0“Corn”
Claim · model-written summary
High stover removal increased surface soil organic carbon loss versus no or medium removal.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- High stover removal ratese0
- Outcome
- SOC losse0
- Direction
- greatere0
- Value
- 20 yearse0
- Qualifier
- surface soil layers (0–15 cm and 0–30 cm)e0
- Comparator
- no or medium stover removale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High stover removal rates resulted in greater SOC loss at the surface soil layers (0–15 cm and 0–30 cm) after 20 years compared with no or medium stover removal”
t0“Corn”
Claim · model-written summary
No-till with stover retention had the same cumulative soil carbon stock loss as conventional tillage or removal.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- stover retention under NTe0
- Outcome
- cumulative SOC stock losse0
- Direction
- samee0
- Comparator
- CT or stover removale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn stover retention under NT resulted in the same cumulative SOC stock loss as CT or stover removal”
Claim · model-written summary
All corn management practices had 8% cumulative soil carbon stock loss in the last 10 years.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- SOC stock losse0
- Direction
- decreasee0
- Value
- 8%e0
- Qualifier
- last 10 years of the studye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All management practices resulted in cumulative (0–120 cm) SOC stock loss (8% decrease) that occurred in the last 10 years of the study”
t0“Corn”
Claim · model-written summary
Surface soil nitrogen stocks were maintained or increased after 20 years.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- Total soil nitrogen stockse0
- Direction
- maintained or increasede0
- Qualifier
- surface soil layers (0–15 cm and 0–30 cm)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total soil nitrogen stocks were maintained or increased after 20 years at the surface soil layers (0–15 cm and 0–30 cm)”
t0“Corn”
Claim · model-written summary
Surface nitrogen stocks were similar under no-till and conventional tillage.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- NTe0
- Outcome
- Total soil nitrogen stockse0
- Direction
- similare0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total soil nitrogen stocks were maintained or increased after 20 years at the surface soil layers (0–15 cm and 0–30 cm) and were similar between NT and CT”
t0“Corn”
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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.