Abstract
Farmers have been encouraged to adopt no‐tillage (NT) because of its positive environmental effects compared with other conservation tillage systems. Nevertheless, poor crop performance under NT management has been reported in both short‐ and long‐term experiments. This study was conducted on six different soils (a poorly drained Taintor soil near Burlington, a moderately well‐drained Kenyon soil near Nashua, a well‐drained Clarion soil near Newell, a well‐drained Galva soil near Sutherland, and a well‐drained Nira soil and a poorly drained Kalona soil near Crawfordsville) in Iowa during 1978 to 2001. Soybean [ Glycine max (L.) Merr.] response to long‐term NT management was evaluated by 5‐yr periods and on the average over the entire study in terms of grain yields and economic returns. The design of the field experiments was a randomized complete block or split plot. Eight tillage systems, including NT, moldboard plow, chisel plow, ridge tillage, alternative tillage, reduced tillage, field cultivation, and tillage‐plant were investigated in a corn ( Zea mays L.)–soybean rotation. Differences between NT and other tillage systems in both soybean grain yields and economic returns remained the same over the entire period of each study, ranging from 8 to 15 yr. No‐tillage generally had less than 5% yield decrease and equal or greater economic returns compared with other tillage systems on well‐drained soils during each 5‐yr period and when averaged over the entire study. Therefore, economic returns favor the adoption of NT for soybean production from both short‐ and long‐term perspectives for well‐drained soils in Iowa.
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Claims 4
Claim · model-written summary
Differences in yield and returns between no-tillage and other systems remained stable over each 8- to 15-year study.
- Taxon
- soybean
Glycine maxe0 - Outcome
- grain yields and economic returnse0
- Direction
- remained the samee0
- Value
- 8 to 15 yre0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences between NT and other tillage systems in both soybean grain yields and economic returns remained the same over the entire period of each study, ranging from 8 to 15 yr.”
Claim · model-written summary
No-tillage generally decreased soybean yield by less than 5% versus other systems on well-drained soils.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- No‐tillagee0
- Outcome
- yielde0
- Direction
- decreasee0
- Value
- less than 5%e0
- Comparator
- other tillage systemse0
- Setting
- well‐drained soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No‐tillage generally had less than 5% yield decrease and equal or greater economic returns compared with other tillage systems on well‐drained soils”
t0“Soybean”
Claim · model-written summary
No-tillage produced equal or greater economic returns than other systems on well-drained soils.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- No‐tillagee0
- Outcome
- economic returnse0
- Direction
- equal or greatere0
- Comparator
- other tillage systemse0
- Setting
- well‐drained soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No‐tillage generally had less than 5% yield decrease and equal or greater economic returns compared with other tillage systems on well‐drained soils”
t0“Soybean”
Claim · model-written summary
The authors recommend adopting no-tillage for soybean on well-drained Iowa soils based on returns.
- Taxon
- soybeanGlycine maxe0
- Outcome
- adoption of NTe0
- Setting
- Iowae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“economic returns favor the adoption of NT for soybean production from both short‐ and long‐term perspectives for well‐drained soils in Iowa.”
The same questions in other papers
tillage · yield · Glycine max (soybean)Positive and negative results
263 papers in the same direction as this paper · 100 in the opposite direction · 26 reporting no difference from an alternative
- no effect
- negative
- no effect
386 papers more in this group
See all 390 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.