Abstract
Abstract Manganese (Mn) toxicity can develop in peanuts grown on low pH soils. The objectives of this study were to quantify the impact of soil pH and magnesium (Mg) on the uptake of Mn and the development of Mn toxicity symptoms in peanut plants and to evaluate the use of the Mg:Mn ratio as a diagnostic tool for Mn toxicity in peanuts. Three greenhouse tests were utilized to meet these objectives: a study to determine dolomitic limestone effects, an experiment comparing rate effects of calcium (Ca), Mg, and potassium (K) on Mn toxicity, and a test to separate the effects of pH, Mn, and Mg on Mn toxicity. Soil, leaf, and stem samples were taken for analysis, and toxicity ratings were made. Increasing pH diminished the toxicity rating and leaf Mn concentration and increased the leaf Mg:Mn ratio. The toxicity rating was significantly correlated with both leaf Mn and Mg:Mn ratio, but leaf Mn generally had stronger correlations and was more useful in diagnosis. Magnesium application resulted in a marked reduction in the Mn toxicity rating and leaf and stem Mn concentrations in the second experiment; however, this result was not repeated in the final test. Using Mg to prevent Mn toxicity would require large Mg applications, which could have the serious detrimental effect of interfering with Ca uptake by the peanut fruit. Liming is the more practical method for avoidance of Mn toxicity in peanuts.
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Claims 8
Claim · model-written summary
Increasing soil pH diminished the Mn toxicity rating and leaf Mn concentration in peanut.
- Taxon
- peanuts
Arachis hypogaeat0 - Treatment
- Increasing pHe1
- Outcome
- toxicity rating and leaf Mn concentratione1
- Direction
- diminishede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Increasing pH diminished the toxicity rating and leaf Mn concentration”
t0“peanuts”
Claim · model-written summary
Increasing soil pH increased the leaf Mg:Mn ratio in peanut.
- Taxon
- peanutsArachis hypogaeat0
- Treatment
- Increasing pHe2
- Outcome
- leaf Mg:Mn ratioe2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Increasing pH diminished the toxicity rating and leaf Mn concentration and increased the leaf Mg:Mn ratio”
t0“peanuts”
Claim · model-written summary
The Mn toxicity rating was significantly correlated with both leaf Mn and the Mg:Mn ratio.
- Taxon
- peanutsArachis hypogaeat0
- Compound
- leaf Mn and Mg:Mn ratioe3
- Outcome
- toxicity ratinge3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The toxicity rating was significantly correlated with both leaf Mn and Mg:Mn ratio”
t0“peanuts”
Claim · model-written summary
Leaf Mn generally had stronger correlations with the toxicity rating than the Mg:Mn ratio and was more useful in diagnosis.
Not reportedTaxon
Verbatim
e4“The toxicity rating was significantly correlated with both leaf Mn and Mg:Mn ratio, but leaf Mn generally had stronger correlations and was more useful in diagnosis”
Claim · model-written summary
In the second experiment, magnesium application markedly reduced the Mn toxicity rating and leaf and stem Mn concentrations.
- Taxon
- peanutsArachis hypogaeat0
- Treatment
- Magnesium applicatione5
- Outcome
- Mn toxicity rating and leaf and stem Mn concentrationse5
- Direction
- marked reductione5
- Qualifier
- second experimente5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Magnesium application resulted in a marked reduction in the Mn toxicity rating and leaf and stem Mn concentrations in the second experiment”
t0“peanuts”
Claim · model-written summary
The Mg-induced reduction in Mn toxicity seen in the second experiment was not repeated in the final test.
- Taxon
- peanutsArachis hypogaeat0
- Treatment
- Magnesium applicatione6
- Outcome
- Mn toxicity rating and leaf and stem Mn concentrationse6
- Direction
- no_changeinferrede6
- Qualifier
- not repeated in the final teste6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Magnesium application resulted in a marked reduction in the Mn toxicity rating and leaf and stem Mn concentrations in the second experiment; however, this result was not repeated in the final test”
t0“peanuts”
Claim · model-written summary
Using Mg to prevent Mn toxicity would require large Mg applications, which could seriously interfere with Ca uptake by the peanut fruit.
- Taxon
- peanutArachis hypogaeae7
- Outcome
- Using Mg to prevent Mn toxicity would require large Mg applicationse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Using Mg to prevent Mn toxicity would require large Mg applications, which could have the serious detrimental effect of interfering with Ca uptake by the peanut fruit”
Claim · model-written summary
Liming is the more practical method for avoiding Mn toxicity in peanuts.
- Taxon
- peanutsArachis hypogaeae0
- Outcome
- avoidance of Mn toxicitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Liming is the more practical method for avoidance of Mn toxicity in peanuts”
The same questions in other papers
ph · pest · Arachis hypogaea (peanut)Results agree
1 paper in the same direction as this paper
- positive
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.