Abstract
SUMMARY In a glasshouse experiment, fertilizer potassium and magnesium were applied in various amounts to 20 soils differing in the proportion of exchangeable potassium to the sum of the three exchangeable cations, potassium, calcium and magnesium. Maize, cv. Ganga-5, was grown as the test crop. In soils where the exchangeable cation ratio (K/Σ (K + Mg + Ca), in equivalents) was less than 0·025, potassium fertilizer significantly increased the dry-matter yield of maize. In soils where this ratio was between 0·026 and 0·05, application of potassium fertilizer was beneficial only up to the intermediate amount of 11 mg K/kg soil. Beyond this amount of application, addition of magnesium was necessary to increase yields. In soils where this ratio exceeded 0·05, potassium fertilizer reduced yields. An optimum ratio of exchangeable calcium, magnesium and potassium appears more important than their absolute amount. Magnesium application to high-potassium soils improved the cation equivalent ratio within the plant and the dry-matter yield.
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Claims 7
Claim · model-written summary
Potassium fertilizer significantly increased dry-matter yield of maize in soils with an exchangeable cation ratio below 0.025
- Material
- Ganga-5e1
- Treatment
- potassium fertilizere2
- Outcome
- dry-matter yielde2
- Direction
- increasede2
- Qualifier
- less than 0·025e2
- Setting
- glasshouse experimente0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a glasshouse experiment, fertilizer potassium and magnesium were applied in various amounts to 20 soils”
e1“Maize, cv. Ganga-5, was grown as the test crop”
e2“In soils where the exchangeable cation ratio (K/Σ (K + Mg + Ca), in equivalents) was less than 0·025, potassium fertilizer significantly increased the dry-matter yield of maize”
Claim · model-written summary
Magnesium addition beyond 11 mg K/kg soil was necessary to increase maize yields in soils with a cation ratio of 0.026-0.05
- Treatment
- addition of magnesiume3
- Outcome
- yieldse3
- Direction
- increasee3
- Qualifier
- Beyond this amount of applicatione3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Maize, cv. Ganga-5, was grown as the test crop”
e3“In soils where this ratio was between 0·026 and 0·05, application of potassium fertilizer was beneficial only up to the intermediate amount of 11 mg K/kg soil. Beyond this amount of application, addition of magnesium was necessary to increase yields”
Claim · model-written summary
Potassium fertilizer was beneficial for maize yields only up to 11 mg K/kg soil in soils with a cation ratio of 0.026-0.05
- Treatment
- potassium fertilizere3
- Outcome
- yieldse3
- Direction
- beneficiale3
- Qualifier
- only up to the intermediate amount of 11 mg K/kg soile3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Maize, cv. Ganga-5, was grown as the test crop”
e3“In soils where this ratio was between 0·026 and 0·05, application of potassium fertilizer was beneficial only up to the intermediate amount of 11 mg K/kg soil. Beyond this amount of application, addition of magnesium was necessary to increase yields”
Claim · model-written summary
Potassium fertilizer reduced maize yields in soils with a cation ratio above 0.05
- Treatment
- potassium fertilizere4
- Outcome
- yieldse4
- Direction
- reducede4
- Qualifier
- In soils where this ratio exceeded 0·05e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Maize, cv. Ganga-5, was grown as the test crop”
e4“In soils where this ratio exceeded 0·05, potassium fertilizer reduced yields”
Claim · model-written summary
An optimum ratio of exchangeable calcium, magnesium and potassium is more important for maize than their absolute amount
- Outcome
- optimum ratio of exchangeable calcium, magnesium and potassiume5
- Comparator
- their absolute amounte5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Maize, cv. Ganga-5, was grown as the test crop”
e5“An optimum ratio of exchangeable calcium, magnesium and potassium appears more important than their absolute amount”
Claim · model-written summary
Magnesium application to high-potassium soils improved the cation equivalent ratio within maize plants
- Treatment
- Magnesium applicatione6
- Outcome
- cation equivalent ratio within the plante6
- Direction
- improvede6
- Qualifier
- high-potassium soilse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Maize, cv. Ganga-5, was grown as the test crop”
e6“Magnesium application to high-potassium soils improved the cation equivalent ratio within the plant and the dry-matter yield”
Claim · model-written summary
Magnesium application to high-potassium soils improved dry-matter yield of maize
- Treatment
- Magnesium applicatione6
- Outcome
- dry-matter yielde6
- Direction
- improvede6
- Qualifier
- high-potassium soilse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Maize, cv. Ganga-5, was grown as the test crop”
e6“Magnesium application to high-potassium soils improved the cation equivalent ratio within the plant and the dry-matter yield”
The same questions in other papers
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- negative
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3,484 papers in the same direction as this paper · 338 in the opposite direction · 85 reporting no difference from an alternative
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See all 3,908 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.