Abstract
Abstract Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions. Five of these soils (Al saturation, 26%‐33%; Ca saturation, 3%‐16%) showed marked responses to lime with % relative yield (percentage of maximum yield) ranging from 5 to 73, 2 soils (Al saturation, 1% and 5%; Ca saturation, 52% and 59%) showed no response (about 95% relative yield) and the remaining 5 soils (Al saturation, 15%‐28%; Ca saturation, 10%‐31%) showed marginal responses (79% to 90% relative yield). Percent relative yield was highly correlated with initial soil values of % Al saturation (r = 0.923), 0.02M CaCl2 soluble Al (r = 0.906), % Ca saturation (r = 0.806) and exchangeable Ca (r = 0.729) and poorly correlated with soil pH (r = 0.559). Overall, Al saturation, soluble Al, Ca saturation and exchangeable Ca values corresponding to 90% relative yield were 27%, 13 mg/L, 21% and 0.7 cmol(+)/kg, respectively. On an individual soil basis, near maximum yield was obtained when liming reduced the soil Al saturation to 25% and increased Ca saturation to 28%. No increase in yields was obtained by liming beyond pH 5.5.
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Claims 16
Claim · model-written summary
Liming gave marked maize yield responses in five of the acidic soils, with relative yields of 5 to 73 percent.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e2“showed marked responses to lime with % relative yield (percentage of maximum yield) ranging from 5 to 73”
Claim · model-written summary
Two soils showed no maize yield response to liming.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e3“showed no response (about 95% relative yield)”
Claim · model-written summary
Five other soils showed marginal maize yield responses to liming, with relative yields of 79 to 90 percent.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e4“showed marginal responses (79% to 90% relative yield)”
Claim · model-written summary
Percent relative yield was highly correlated with initial soil % Al saturation.
- Outcome
- Percent relative yielde5
- Value
- r = 0.923e5
- Qualifier
- initial soil values of % Al saturatione5
- Setting
- greenhouse conditionse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e5“Percent relative yield was highly correlated with initial soil values of % Al saturation (r = 0.923), 0.02M CaCl2 soluble Al (r = 0.906), % Ca saturation (r = 0.806) and exchangeable Ca (r = 0.729) and poorly correlated with soil pH (r = 0.559)”
Claim · model-written summary
Percent relative yield was highly correlated with soluble Al in the soil.
- Outcome
- Percent relative yielde5
- Value
- r = 0.906e5
- Qualifier
- 0.02M CaCl2 soluble Ale5
- Setting
- greenhouse conditionse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e5“Percent relative yield was highly correlated with initial soil values of % Al saturation (r = 0.923), 0.02M CaCl2 soluble Al (r = 0.906), % Ca saturation (r = 0.806) and exchangeable Ca (r = 0.729) and poorly correlated with soil pH (r = 0.559)”
Claim · model-written summary
Percent relative yield was highly correlated with % Ca saturation.
- Outcome
- Percent relative yielde5
- Value
- r = 0.806e5
- Qualifier
- % Ca saturatione5
- Setting
- greenhouse conditionse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e5“Percent relative yield was highly correlated with initial soil values of % Al saturation (r = 0.923), 0.02M CaCl2 soluble Al (r = 0.906), % Ca saturation (r = 0.806) and exchangeable Ca (r = 0.729) and poorly correlated with soil pH (r = 0.559)”
Claim · model-written summary
Percent relative yield was highly correlated with exchangeable Ca.
- Outcome
- Percent relative yielde5
- Value
- r = 0.729e5
- Qualifier
- exchangeable Cae5
- Setting
- greenhouse conditionse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e5“Percent relative yield was highly correlated with initial soil values of % Al saturation (r = 0.923), 0.02M CaCl2 soluble Al (r = 0.906), % Ca saturation (r = 0.806) and exchangeable Ca (r = 0.729) and poorly correlated with soil pH (r = 0.559)”
Claim · model-written summary
Percent relative yield was poorly correlated with soil pH.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e5“Percent relative yield was highly correlated with initial soil values of % Al saturation (r = 0.923), 0.02M CaCl2 soluble Al (r = 0.906), % Ca saturation (r = 0.806) and exchangeable Ca (r = 0.729) and poorly correlated with soil pH (r = 0.559)”
Claim · model-written summary
Al saturation corresponding to 90 percent relative yield was 27 percent.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e6“Overall, Al saturation, soluble Al, Ca saturation and exchangeable Ca values corresponding to 90% relative yield were 27%, 13 mg/L, 21% and 0.7 cmol(+)/kg, respectively”
Claim · model-written summary
Soluble Al corresponding to 90 percent relative yield was 13 mg/L.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e6“Overall, Al saturation, soluble Al, Ca saturation and exchangeable Ca values corresponding to 90% relative yield were 27%, 13 mg/L, 21% and 0.7 cmol(+)/kg, respectively”
Claim · model-written summary
Ca saturation corresponding to 90 percent relative yield was 21 percent.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e6“Overall, Al saturation, soluble Al, Ca saturation and exchangeable Ca values corresponding to 90% relative yield were 27%, 13 mg/L, 21% and 0.7 cmol(+)/kg, respectively”
Claim · model-written summary
Exchangeable Ca corresponding to 90 percent relative yield was 0.7 cmol(+)/kg.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e6“Overall, Al saturation, soluble Al, Ca saturation and exchangeable Ca values corresponding to 90% relative yield were 27%, 13 mg/L, 21% and 0.7 cmol(+)/kg, respectively”
Claim · model-written summary
On individual soils, near maximum yield was obtained with liming.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e7“On an individual soil basis, near maximum yield was obtained when liming reduced the soil Al saturation to 25% and increased Ca saturation to 28%”
Claim · model-written summary
Liming reduced soil Al saturation to 25 percent in soils giving near maximum yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e7“On an individual soil basis, near maximum yield was obtained when liming reduced the soil Al saturation to 25% and increased Ca saturation to 28%”
Claim · model-written summary
Liming increased Ca saturation to 28 percent in soils giving near maximum yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e7“On an individual soil basis, near maximum yield was obtained when liming reduced the soil Al saturation to 25% and increased Ca saturation to 28%”
Claim · model-written summary
Liming beyond pH 5.5 gave no increase in maize yields.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Effects of four rates of lime applications to maize grown in 12 strongly acidic soils of southern Nigeria belonging to Ultisol and Inceptisol orders were studied under greenhouse conditions”
e2“No increase in yields was obtained by liming beyond pH 5.5”
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