Abstract
Abstract High K fertilization often reduces leaf Mg and Ca concentration, increasing the incidence of grass tetany, while increased P treatment increases uptake and leaf concentrations of Mg and Ca in winter wheat ( Triticum aestivum L.). Since P availability and uptake are often reduced at low soil temperatures, the effects of P and K nutrition on mineral element composition of wheat at two root‐zone temperatures were determined. The effects of P and NPK + Mg fertilization on leaf elemental concentrations of tall fescue ( Festuca arundinacea Schreb.) grown in the field near Mt. Vernon, MO, on a Creldon silty clay loam (fine, mixed, mesic Mollic Fragiudalf) were determined. Concentration of Mg in wheat shoots was 20% higher when treated with 400 μ M P than 50 μ M P, and only 9% higher when root‐zone temperature was 25°C rather than 15°C. Similarly, shoot Ca concentration was 11% higher with the high P treatment. Total plant Mg uptake was 60% greater and total Ca uptake was 51% greater with high P. The higher root‐zone temperature increased total plant Mg uptake 38% and total plant Ca uptake 36%. Increasing K treatment from 400 to 800 μ M decreased shoot Mg concentration 13% and shoot Ca concentration 7%. In the field, at soil temperatures <15°C, treatments of 20 or 28 kg ha −1 P increased both Mg and Ca leaf concentration of tall fescue. When leaf Mg and Ca concentrations in control plots were below 2.0 and 4.0 g mg −1 respectively, P fertilization increased Mg and Ca concentration above those thresholds considered likely to cause grass tetany. Fertilization with Mg increased leaf Mg concentration only when P fertilizer was added, but caused a decrease in leaf Ca concentration when no P fertilizer was applied. Leaf concentration and total plant uptake of Mg and Ca were more dependent on P nutrition than root temperature.
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Claims 14
Claim · model-written summary
Shoot Mg concentration of wheat was 20% higher with 400 μ M P than with 50 μ M P.
- Taxon
- wheat
Triticum aestivume0 - Organ / stage
- shootse0
- Treatment
- 400 μ M Pe0
- Outcome
- Concentration of Mge0
- Direction
- highere0
- Value
- 20%e0
- Comparator
- 50 μ M Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentration of Mg in wheat shoots was 20% higher when treated with 400 μ M P than 50 μ M P, and only 9% higher when root‐zone temperature was 25°C rather than 15°C”
Claim · model-written summary
Shoot Mg concentration of wheat was 9% higher at a root-zone temperature of 25°C than at 15°C.
- Taxon
- wheatTriticum aestivume0
- Organ / stage
- shootse0
- Treatment
- root‐zone temperature was 25°Ce0
- Outcome
- Concentration of Mge0
- Direction
- highere0
- Value
- 9%e0
- Comparator
- 15°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentration of Mg in wheat shoots was 20% higher when treated with 400 μ M P than 50 μ M P, and only 9% higher when root‐zone temperature was 25°C rather than 15°C”
Claim · model-written summary
Shoot Ca concentration of wheat was 11% higher with the high P treatment.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- shoote2
- Treatment
- high P treatmente2
- Outcome
- shoot Ca concentratione2
- Direction
- highere2
- Value
- 11%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e2“Similarly, shoot Ca concentration was 11% higher with the high P treatment”
Claim · model-written summary
Total plant Mg uptake of wheat was 60% greater with high P.
- Taxon
- wheatTriticum aestivume1
- Treatment
- high Pe3
- Outcome
- Total plant Mg uptakee3
- Direction
- greatere3
- Value
- 60%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e3“Total plant Mg uptake was 60% greater and total Ca uptake was 51% greater with high P”
Claim · model-written summary
Total plant Ca uptake of wheat was 51% greater with high P.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e3“Total plant Mg uptake was 60% greater and total Ca uptake was 51% greater with high P”
Claim · model-written summary
A higher root-zone temperature increased total plant Mg uptake of wheat by 38%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- higher root‐zone temperaturee4
- Outcome
- total plant Mg uptakee4
- Direction
- increasede4
- Value
- 38%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e4“The higher root‐zone temperature increased total plant Mg uptake 38% and total plant Ca uptake 36%”
Claim · model-written summary
A higher root-zone temperature increased total plant Ca uptake of wheat by 36%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- higher root‐zone temperaturee4
- Outcome
- total plant Ca uptakee4
- Direction
- increasede4
- Value
- 36%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e4“The higher root‐zone temperature increased total plant Mg uptake 38% and total plant Ca uptake 36%”
Claim · model-written summary
Increasing K from 400 to 800 μ M decreased shoot Mg concentration of wheat by 13%.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- shoote5
- Treatment
- Increasing K treatment from 400 to 800 μ Me5
- Outcome
- shoot Mg concentratione5
- Direction
- decreasede5
- Value
- 13%e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e5“Increasing K treatment from 400 to 800 μ M decreased shoot Mg concentration 13% and shoot Ca concentration 7%”
Claim · model-written summary
Increasing K from 400 to 800 μ M decreased shoot Ca concentration of wheat by 7%.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- shoote5
- Treatment
- Increasing K treatment from 400 to 800 μ Me5
- Outcome
- shoot Ca concentratione5
- Direction
- decreasede5
- Value
- 7%e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e5“Increasing K treatment from 400 to 800 μ M decreased shoot Mg concentration 13% and shoot Ca concentration 7%”
Claim · model-written summary
In the field, P applied at 20 or 28 kg ha −1 increased both Mg and Ca leaf concentration of tall fescue at soil temperatures below 15°C.
- Taxon
- tall fescue
Lolium arundinaceume7 - Organ / stage
- leafe6
- Treatment
- 20 or 28 kg ha −1 Pe6
- Outcome
- Mg and Ca leaf concentratione6
- Direction
- increasede6
- Qualifier
- at soil temperatures <15°Ce6
- Setting
- In the fielde6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“In the field, at soil temperatures <15°C, treatments of 20 or 28 kg ha −1 P increased both Mg and Ca leaf concentration of tall fescue”
e7“tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
P fertilization raised leaf Mg and Ca concentrations of tall fescue above thresholds considered likely to cause grass tetany where control concentrations were below them.
- Taxon
- tall fescueLolium arundinaceume6
- Organ / stage
- leafe7
- Treatment
- P fertilizatione7
- Outcome
- Mg and Ca concentratione7
- Direction
- increasede7
- Qualifier
- above those thresholds considered likely to cause grass tetanye7
- Comparator
- control plotse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“When leaf Mg and Ca concentrations in control plots were below 2.0 and 4.0 g mg −1 respectively, P fertilization increased Mg and Ca concentration above those thresholds considered likely to cause grass tetany”
e6“tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Fertilization with Mg increased leaf Mg concentration of tall fescue only when P fertilizer was added.
- Taxon
- tall fescueLolium arundinaceume7
- Treatment
- Fertilization with Mge6
- Outcome
- leaf Mg concentratione6
- Direction
- increasede6
- Qualifier
- only when P fertilizer was addede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Fertilization with Mg increased leaf Mg concentration only when P fertilizer was added, but caused a decrease in leaf Ca concentration when no P fertilizer was applied”
e7“tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Fertilization with Mg decreased leaf Ca concentration of tall fescue when no P fertilizer was applied.
- Taxon
- tall fescueLolium arundinaceume7
- Treatment
- Fertilization with Mge6
- Outcome
- leaf Ca concentratione6
- Direction
- decreasee6
- Qualifier
- when no P fertilizer was appliede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Fertilization with Mg increased leaf Mg concentration only when P fertilizer was added, but caused a decrease in leaf Ca concentration when no P fertilizer was applied”
e7“tall fescue ( Festuca arundinacea Schreb.)”
Claim · model-written summary
Leaf concentration and total plant uptake of Mg and Ca depend more on P nutrition than on root temperature.
- Taxon
- wheatTriticum aestivume1
- Treatment
- P nutritione6
- Outcome
- Leaf concentration and total plant uptake of Mg and Cae6
- Direction
- more dependente6
- Comparator
- root temperaturee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e6“Leaf concentration and total plant uptake of Mg and Ca were more dependent on P nutrition than root temperature”
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See all 226 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.