Abstract
Abstract An experiment was conducted over three consecutive seasons during 1982 and 1983 to evaluate the effects of traffic‐induced compaction on growth and yield of maize, cowpea and soya bean grown in a tropical Alfisol for no‐tillage and ploughed systems. Compaction treatments of no, two and four passes of a 2‐tonne roller were used on the sub‐plots. The roller was 60 cm in diameter, 180 cm long, with a contact area of 0.1729 m 2 and was pulled by a 33.6 kW tractor. The four‐pass treatment reduced percentage emergence, plant height, leaf number, leaf area index, and dry matter yield of maize, cowpea and soya bean. These reductions were more marked on ploughed than on no‐till plots. The two‐and four‐pass treatments significantly reduced root growth of maize, cowpea and soya bean in the 0–70 mm depth, but the reduction in root density was greater in ploughed than in no‐tillage. The two‐and four‐pass compaction treatments reduced plant nutrient uptake and grain yield of maize, cowpea and soya bean. The four‐pass treatment reduced maize grain yield by 48% in all seasons under no‐tillage and by 53, 61 and 75% after ploughing in the first, second and third consecutive cropping seasons respectively, compared to the yield of the relevant non‐compacted treatment. Cowpea yield was reduced by 38% in all seasons after no‐tillage and by 39, 50 and 57% after ploughing during the first, second and third consecutive cropping season respectively. The response of soya bean to four‐pass compaction resulted in yield reduction by 50,64 and 25% after no‐tillage and by 47, 48 and 65% after ploughing in the first, second and third consecutive cropping season, respectively. Crop yields were found to be negatively correlated with soil bulk density, penetrometer resistance, and relative compaction, and positively correlated with infiltration rate, soil moisture content and specific volume. Multiple regression equations were also developed between crop yield and soil properties.
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Claims 20
Claim · model-written summary
Four roller passes reduced emergence, plant height and leaf number of maize.
- Treatment
- four‐pass treatmente0
- Outcome
- percentage emergence, plant height, leaf numbere0
- Direction
- reducede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The four‐pass treatment reduced percentage emergence, plant height, leaf number, leaf area index, and dry matter yield of maize, cowpea and soya bean.”
Claim · model-written summary
Four roller passes reduced leaf area index and dry matter yield of maize.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The four‐pass treatment reduced percentage emergence, plant height, leaf number, leaf area index, and dry matter yield of maize, cowpea and soya bean.”
Claim · model-written summary
Two and four roller passes significantly reduced root growth of maize at 0–70 mm.
- Organ / stage
- 0–70 mm depthe0
- Treatment
- two‐and four‐pass treatmentse0
- Outcome
- root growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two‐and four‐pass treatments significantly reduced root growth of maize, cowpea and soya bean in the 0–70 mm depth, but the reduction in root density was greater in ploughed than in no‐tillage.”
Claim · model-written summary
Two and four pass compaction reduced nutrient uptake and grain yield of maize.
- Treatment
- two‐and four‐pass compaction treatmentse0
- Outcome
- plant nutrient uptake and grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two‐and four‐pass compaction treatments reduced plant nutrient uptake and grain yield of maize, cowpea and soya bean.”
Claim · model-written summary
Four roller passes reduced emergence, plant height and leaf number of cowpea.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- four‐pass treatmente0
- Outcome
- percentage emergence, plant height, leaf numbere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The four‐pass treatment reduced percentage emergence, plant height, leaf number, leaf area index, and dry matter yield of maize, cowpea and soya bean.”
Claim · model-written summary
Four roller passes reduced leaf area index and dry matter yield of cowpea.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- four‐pass treatmente0
- Outcome
- leaf area index, and dry matter yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The four‐pass treatment reduced percentage emergence, plant height, leaf number, leaf area index, and dry matter yield of maize, cowpea and soya bean.”
Claim · model-written summary
Two and four roller passes significantly reduced root growth of cowpea at 0–70 mm.
- Taxon
- cowpeaVigna unguiculatae0
- Organ / stage
- 0–70 mm depthe0
- Treatment
- two‐and four‐pass treatmentse0
- Outcome
- root growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two‐and four‐pass treatments significantly reduced root growth of maize, cowpea and soya bean in the 0–70 mm depth, but the reduction in root density was greater in ploughed than in no‐tillage.”
Claim · model-written summary
Two and four pass compaction reduced nutrient uptake and grain yield of cowpea.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- two‐and four‐pass compaction treatmentse0
- Outcome
- plant nutrient uptake and grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two‐and four‐pass compaction treatments reduced plant nutrient uptake and grain yield of maize, cowpea and soya bean.”
Claim · model-written summary
Four roller passes reduced emergence, plant height and leaf number of soya bean.
- Taxon
- soya beane0
- Treatment
- four‐pass treatmente0
- Outcome
- percentage emergence, plant height, leaf numbere0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“The four‐pass treatment reduced percentage emergence, plant height, leaf number, leaf area index, and dry matter yield of maize, cowpea and soya bean.”
Claim · model-written summary
Four roller passes reduced leaf area index and dry matter yield of soya bean.
- Taxon
- soya beane0
- Treatment
- four‐pass treatmente0
- Outcome
- leaf area index, and dry matter yielde0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“The four‐pass treatment reduced percentage emergence, plant height, leaf number, leaf area index, and dry matter yield of maize, cowpea and soya bean.”
Claim · model-written summary
Two and four roller passes significantly reduced root growth of soya bean at 0–70 mm.
- Taxon
- soya beane0
- Organ / stage
- 0–70 mm depthe0
- Treatment
- two‐and four‐pass treatmentse0
- Outcome
- root growthe0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“The two‐and four‐pass treatments significantly reduced root growth of maize, cowpea and soya bean in the 0–70 mm depth, but the reduction in root density was greater in ploughed than in no‐tillage.”
Claim · model-written summary
Two and four pass compaction reduced nutrient uptake and grain yield of soya bean.
- Taxon
- soya beane0
- Treatment
- two‐and four‐pass compaction treatmentse0
- Outcome
- plant nutrient uptake and grain yielde0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“The two‐and four‐pass compaction treatments reduced plant nutrient uptake and grain yield of maize, cowpea and soya bean.”
Claim · model-written summary
Compaction reductions were stronger on ploughed plots than no-till plots.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These reductions were more marked on ploughed than on no‐till plots.”
t0“maize, cowpea and soya bean”
Claim · model-written summary
Root density reductions were greater under ploughing than no tillage.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two‐and four‐pass treatments significantly reduced root growth of maize, cowpea and soya bean in the 0–70 mm depth, but the reduction in root density was greater in ploughed than in no‐tillage.”
t0“maize, cowpea and soya bean”
Claim · model-written summary
Four-pass compaction reduced maize yield; reported no-till reduction was 48%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The four‐pass treatment reduced maize grain yield by 48% in all seasons under no‐tillage and by 53, 61 and 75% after ploughing in the first, second and third consecutive cropping seasons respectively, compared to the yield of the relevant non‐compacted treatment.”
Claim · model-written summary
Four-pass compaction reduced cowpea yield; reported no-till reduction was 38%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cowpea yield was reduced by 38% in all seasons after no‐tillage and by 39, 50 and 57% after ploughing during the first, second and third consecutive cropping season respectively.”
Claim · model-written summary
Four-pass compaction reduced soya bean yield; reported no-till reduction was 50,64 and 25%.
- Taxon
- soya beane0
- Treatment
- four‐pass compactione0
- Outcome
- yielde0
- Direction
- reductione0
- Value
- 50,64 and 25%e0
Not reportedComparator
Verbatim
e0“The response of soya bean to four‐pass compaction resulted in yield reduction by 50,64 and 25% after no‐tillage and by 47, 48 and 65% after ploughing in the first, second and third consecutive cropping season, respectively.”
Claim · model-written summary
Crop yields correlated negatively with bulk density, penetrometer resistance and relative compaction.
- Outcome
- Crop yieldse0
- Direction
- negatively correlatede0
- Comparator
- soil bulk density, penetrometer resistance, and relative compactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop yields were found to be negatively correlated with soil bulk density, penetrometer resistance, and relative compaction, and positively correlated with infiltration rate, soil moisture content and specific volume.”
t0“maize, cowpea and soya bean”
Claim · model-written summary
Crop yields correlated positively with infiltration rate, soil moisture and specific volume.
- Outcome
- Crop yieldse0
- Direction
- positively correlatede0
- Comparator
- infiltration rate, soil moisture content and specific volumee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop yields were found to be negatively correlated with soil bulk density, penetrometer resistance, and relative compaction, and positively correlated with infiltration rate, soil moisture content and specific volume.”
t0“maize, cowpea and soya bean”
Claim · model-written summary
Multiple regression equations linked crop yield to soil properties.
Not reportedDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Multiple regression equations were also developed between crop yield and soil properties.”
t0“maize, cowpea and soya bean”
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tillage · yield · Vigna unguiculata (cowpea)Results differ
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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.