Abstract
Cultivated steeplands in the humid tropics require better soil management systems to meet increasing food demands. The objective of this 4‐yr study was to evaluate the following four contour soil management systems for corn ( Zea mays L.) production: (i) contour moldboard plowing (CP); (ii) ridge tillage (RT); (iii) natural grass barrier strips plus moldboard plowing (GCP); and (iv) grass strips plus ridge tillage (GRT). Eight successive corn crops were grown in limed and fertilized soil from 1992 through 1995. On a total land area basis (cropped area plus the area occupied by the grass strips), the 1995 mean grain yields for RT (10.8 Mg ha −1 ) and GRT (10.3 Mg ha −1 ) were significantly greater than yields for CP (10.0 Mg ha −1 ) and GCP (9.6 Mg ha −1 ). The corn grain yields for the CP and RT systems before 1995 ranged from 1.3 Mg ha −1 in 1992 to 8.4 Mg ha −1 in 1993, while comparable GCP and GRT yields ranged from 1.4 to 7.6 Mg ha −1 . Excluding the area occupied by the grass strips, the GRT system had the highest 4‐yr average corn yield (7.3 Mg ha −1 ) followed by the GCP (7.2 Mg ha −1 ), RT (6.9 Mg ha −1 ) and CP (6.7 Mg ha −1 ) systems. Yields improved during the 1994 and 1995 growing seasons when the grass was not permitted to grow as tall. The combination of contour ridge tillage and contour grass strips has potential for sustaining crop productivity on highly erodible steepland soils in the humid tropics.
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Claims 10
Claim · model-written summary
RT yielded 10.8 Mg per hectare in 1995, significantly above CP and GCP.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- RTe1
- Outcome
- grain yieldse1
- Direction
- significantly greatere1
- Value
- 10.8 Mg ha −1e1
- Comparator
- CPe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“the 1995 mean grain yields for RT (10.8 Mg ha −1 ) and GRT (10.3 Mg ha −1 ) were significantly greater than yields for CP (10.0 Mg ha −1 ) and GCP (9.6 Mg ha −1 )”
Claim · model-written summary
GRT yielded 10.3 Mg per hectare in 1995, significantly above CP and GCP.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- GRTe1
- Outcome
- grain yieldse1
- Direction
- significantly greatere1
- Value
- 10.3 Mg ha −1e1
- Comparator
- GCPe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“the 1995 mean grain yields for RT (10.8 Mg ha −1 ) and GRT (10.3 Mg ha −1 ) were significantly greater than yields for CP (10.0 Mg ha −1 ) and GCP (9.6 Mg ha −1 )”
Claim · model-written summary
CP grain yield ranged from 1.3 in 1992 to 8.4 Mg per hectare in 1993.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- CPe1
- Outcome
- corn grain yieldse1
- Direction
- rangede1
- Value
- 1.3 Mg ha −1e1
- Qualifier
- to 8.4 Mg ha −1 in 1993e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“The corn grain yields for the CP and RT systems before 1995 ranged from 1.3 Mg ha −1 in 1992 to 8.4 Mg ha −1 in 1993”
Claim · model-written summary
GCP and GRT grain yield before 1995 ranged from 1.4 to 7.6 Mg per hectare.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- GCP and GRT yieldse1
- Direction
- rangede1
- Value
- 1.4 to 7.6 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“comparable GCP and GRT yields ranged from 1.4 to 7.6 Mg ha −1”
Claim · model-written summary
GRT had the highest four-year average yield excluding grass strip area, 7.3 Mg per hectare.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- GRTe1
- Outcome
- 4‐yr average corn yielde1
- Direction
- higheste1
- Value
- 7.3 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Excluding the area occupied by the grass strips, the GRT system had the highest 4‐yr average corn yield (7.3 Mg ha −1 )”
Claim · model-written summary
GCP four-year average yield was 7.2 Mg per hectare.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- GCPe1
- Outcome
- GCPe1
- Value
- 7.2 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“followed by the GCP (7.2 Mg ha −1 ), RT (6.9 Mg ha −1 ) and CP (6.7 Mg ha −1 ) systems”
Claim · model-written summary
RT four-year average yield was 6.9 Mg per hectare.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- RTe1
- Outcome
- RTe1
- Value
- 6.9 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“followed by the GCP (7.2 Mg ha −1 ), RT (6.9 Mg ha −1 ) and CP (6.7 Mg ha −1 ) systems”
Claim · model-written summary
CP four-year average yield was 6.7 Mg per hectare.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- CPe1
- Outcome
- CPe1
- Value
- 6.7 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“followed by the GCP (7.2 Mg ha −1 ), RT (6.9 Mg ha −1 ) and CP (6.7 Mg ha −1 ) systems”
Claim · model-written summary
Corn yields improved in 1994 and 1995 when grass height was limited.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- grass was not permitted to grow as talle1
- Outcome
- Yieldse1
- Direction
- improvede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Yields improved during the 1994 and 1995 growing seasons when the grass was not permitted to grow as tall”
Claim · model-written summary
The authors propose contour ridge tillage with grass strips to sustain crop productivity.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- combination of contour ridge tillage and contour grass stripse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“The combination of contour ridge tillage and contour grass strips has potential for sustaining crop productivity on highly erodible steepland soils in the humid tropics”
The same questions in other papers
tillage · yield · Zea mays (maize)Positive and negative results
811 papers in the same direction as this paper · 230 in the opposite direction · 57 reporting no difference from an alternative
- no effect
- negative
- no effect
1,095 papers more in this group
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.