Abstract
Research study on the effect of tillage systems and application rate of poultry manure on sweet potato (Ipomoea batatas) in Alfisol of southwest Nigeria is lacking. Field trials were conducted in 2006, 2007 and 2008 cropping seasons on an Alfisol (Oxic Tropuldalf) at Owo in rainforest zone of southwest Nigeria. The trials consisted of the factorial combinations of two tillage methods (manual clearing and conventional tillage) and four manure levels (0, 5, 10 and 15 t/ha) arranged in a randomized complete block design and replicated three times. Conventional tillage alone (CTo) resulted in lower soil N, P, K, Ca, Mg and soil organic C and better leaf N, P, K, Ca and Mg concentrations, growth and yield of sweet potato compared with manually cleared (MCo) plots. The better performance of sweet potato under conventional tillage (CTo) was adduced to reduced bulk density. Bulk density was negatively correlated with yield. Conventional tillage alone (CTo) improves sweet potato tuber yield by 62, 55 and 42% in 2006, 2007 and 2008, respectively compared with manual clearing alone (MCo). In both the manually cleared and conventionally tilled plots, soil organic C, N, P, K, Ca, Mg and water content increased with amount of poultry manure, while soil pH, bulk density and temperature were reduced. Yields given by 5, 10 and 15 t/ha poultry manure were not significantly different under both manually cleared and conventionally tilled treatments. Conventional tillage plus 5 t/ha poultry manure (CT+5 PM) produced the highest overall yield. Compared with manual clearing alone (MCo) and conventional tillage alone (CTo), conventional tillage plus 5 t/ha poultry manure (CT+5 PM) improved tuber yield of sweet potato by 117 and 43%, respectively. Therefore the use of 5 t/ha poultry manure with conventional tillage is recommended for sweet potato production on an Alfisol of southwest Nigeria.
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Claims 14
Claim · model-written summary
Conventional tillage lowered soil nutrients and organic carbon versus manual clearing.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatase0 - Treatment
- Conventional tillage alone (CTo)e0
- Outcome
- soil N, P, K, Ca, Mg and soil organic Ce0
- Direction
- lowere0
- Comparator
- manually cleared (MCo) plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“Conventional tillage alone (CTo) resulted in lower soil N, P, K, Ca, Mg and soil organic C and better leaf N, P, K, Ca and Mg concentrations, growth and yield of sweet potato compared with manually cleared (MCo) plots.”
Claim · model-written summary
Conventional tillage improved leaf nutrient concentrations relative to manual clearing.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- Conventional tillage alone (CTo)e0
- Outcome
- leaf N, P, K, Ca and Mg concentrationse0
- Direction
- bettere0
- Comparator
- manually cleared (MCo) plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional tillage alone (CTo) resulted in lower soil N, P, K, Ca, Mg and soil organic C and better leaf N, P, K, Ca and Mg concentrations, growth and yield of sweet potato compared with manually cleared (MCo) plots.”
Claim · model-written summary
Conventional tillage improved sweet potato growth and yield relative to manual clearing.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- Conventional tillage alone (CTo)e0
- Outcome
- growth and yielde0
- Direction
- bettere0
- Comparator
- manually cleared (MCo) plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional tillage alone (CTo) resulted in lower soil N, P, K, Ca, Mg and soil organic C and better leaf N, P, K, Ca and Mg concentrations, growth and yield of sweet potato compared with manually cleared (MCo) plots.”
Claim · model-written summary
Bulk density was negatively correlated with sweet potato yield.
- Taxon
- sweet potatoIpomoea batatast0
- Outcome
- yielde0
- Direction
- negatively correlatede0
- Qualifier
- Bulk densitye0
- Setting
- Bulk densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bulk density was negatively correlated with yield.”
t0“sweet potato”
Claim · model-written summary
Conventional tillage improved tuber yield by 62% in 2006 versus manual clearing.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- Conventional tillage alone (CTo)e0
- Outcome
- tuber yielde0
- Direction
- improvese0
- Value
- 62e0
- Qualifier
- 2006e0
- Comparator
- manual clearing alone (MCo)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional tillage alone (CTo) improves sweet potato tuber yield by 62, 55 and 42% in 2006, 2007 and 2008, respectively compared with manual clearing alone (MCo).”
Claim · model-written summary
Conventional tillage improved tuber yield by 55% in 2007 versus manual clearing.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- Conventional tillage alone (CTo)e0
- Outcome
- tuber yielde0
- Direction
- improvese0
- Value
- 55e0
- Qualifier
- 2007e0
- Comparator
- manual clearing alone (MCo)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional tillage alone (CTo) improves sweet potato tuber yield by 62, 55 and 42% in 2006, 2007 and 2008, respectively compared with manual clearing alone (MCo).”
Claim · model-written summary
Conventional tillage improved tuber yield by 42% in 2008 versus manual clearing.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- Conventional tillage alone (CTo)e0
- Outcome
- tuber yielde0
- Direction
- improvese0
- Value
- 42%e0
- Qualifier
- 2008e0
- Comparator
- manual clearing alone (MCo)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional tillage alone (CTo) improves sweet potato tuber yield by 62, 55 and 42% in 2006, 2007 and 2008, respectively compared with manual clearing alone (MCo).”
Claim · model-written summary
Increasing poultry manure increased soil organic carbon, nutrients and water content in both tillage systems.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- poultry manuree0
- Outcome
- soil organic C, N, P, K, Ca, Mg and water contente0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both the manually cleared and conventionally tilled plots, soil organic C, N, P, K, Ca, Mg and water content increased with amount of poultry manure”
t0“sweet potato”
Claim · model-written summary
Increasing poultry manure reduced soil pH, bulk density and temperature in both tillage systems.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- poultry manuree1
- Outcome
- soil pH, bulk density and temperaturee0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil pH, bulk density and temperature were reduced”
e1“In both the manually cleared and conventionally tilled plots, soil organic C, N, P, K, Ca, Mg and water content increased with amount of poultry manure”
t0“sweet potato”
Claim · model-written summary
Yield did not differ significantly among the three manure rates in either tillage system.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 5, 10 and 15 t/ha poultry manuree0
- Outcome
- Yieldse0
- Direction
- not significantly differente0
- Comparator
- 5, 10 and 15 t/ha poultry manuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields given by 5, 10 and 15 t/ha poultry manure were not significantly different under both manually cleared and conventionally tilled treatments.”
t0“sweet potato”
Claim · model-written summary
Conventional tillage with 5 t/ha manure produced the highest overall yield.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- Conventional tillage plus 5 t/ha poultry manure (CT+5 PM)e0
- Outcome
- overall yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional tillage plus 5 t/ha poultry manure (CT+5 PM) produced the highest overall yield.”
t0“sweet potato”
Claim · model-written summary
Conventional tillage with 5 t/ha manure improved tuber yield by 117% versus manual clearing alone.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- conventional tillage plus 5 t/ha poultry manure (CT+5 PM)e0
- Outcome
- tuber yielde0
- Direction
- improvede0
- Value
- 117e0
- Comparator
- manual clearing alone (MCo)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with manual clearing alone (MCo) and conventional tillage alone (CTo), conventional tillage plus 5 t/ha poultry manure (CT+5 PM) improved tuber yield of sweet potato by 117 and 43%, respectively.”
Claim · model-written summary
Conventional tillage with 5 t/ha manure improved tuber yield by 43% versus conventional tillage alone.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- conventional tillage plus 5 t/ha poultry manure (CT+5 PM)e0
- Outcome
- tuber yielde0
- Direction
- improvede0
- Value
- 43%e0
- Comparator
- conventional tillage alone (CTo)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with manual clearing alone (MCo) and conventional tillage alone (CTo), conventional tillage plus 5 t/ha poultry manure (CT+5 PM) improved tuber yield of sweet potato by 117 and 43%, respectively.”
Claim · model-written summary
The authors recommend 5 t/ha poultry manure with conventional tillage for sweet potato production.
- Taxon
- sweet potatoIpomoea batatase0
- Outcome
- use of 5 t/ha poultry manure with conventional tillagee0
- Setting
- southwest Nigeriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the use of 5 t/ha poultry manure with conventional tillage is recommended for sweet potato production on an Alfisol of southwest Nigeria.”
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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.