Abstract
Abstract Grass tetany has been observed in cattle grazing cool‐season grasses during the late winter and early spring in the southeastern USA. It has been suggested that Al is involved when this problem occurs on wet sites. Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville (2 years) and Chapel Hill, Tenn. (1 year) to determine fertilizer effects on K, Mg, Ca, and Al concentrations of forage grown on soils subject to flooding. The soils were Lindside loam (fine‐silty, mixed, mesic Fluvaquentic Eutrochrepts) and Roellen silty clay loam (fine, mixed, thermic Vertic Haplaquolls). Treatments consisted of a control and fall applied Sul‐Po‐Mag (2 MgSO 4 • K 2 SO 4 ), Epsom salts (MgSO 4 • 7 H 2 O) + potassium sulfate (K 2 SO 4 ), Epsom salts alone, or potassium sulfate alone to supply 112 kg Mg and/or 181 kg K ha −1 . The forage was sampled from February through early May while these soils were usually saturated with water and at some times while there was water standing on the surface. Magnesium fertilization had little effect on forage Mg while K fertilization usually increased forage K. As growth increased, forage K increased in early spring. Equivalent ratios of K/(Ca + Mg) closely followed trends of forage K and increased potential for tetany but remained below 2.2. Magnesium concentrations remained low (< 2 g kg −1 ) in the forage through early May. Aluminum and Ca concentrations were usually unaffected by fertilization treatments. There was no apparent benefit from fertilizing these soils with Mg sources. Concentrations of Al dropped considerably when the plant growth was not close to the wet soil surface and when standing water was not present. Apparently, soil Al adhered to the leaves in contact with wet soil or standing water since Al uptake through the roots would be very limited with the soil pH about 6.0.
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Claims 9
Claim · model-written summary
Magnesium fertilization had little effect on forage Mg.
- Taxon
- Tall fescue
Lolium arundinaceume1 - Treatment
- Magnesium fertilizatione2
- Outcome
- forage Mge2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville”
e2“Magnesium fertilization had little effect on forage Mg while K fertilization usually increased forage K”
Claim · model-written summary
K fertilization usually increased forage K.
- Taxon
- Tall fescueLolium arundinaceume1
- Treatment
- K fertilizatione2
- Outcome
- forage Ke2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville”
e2“Magnesium fertilization had little effect on forage Mg while K fertilization usually increased forage K”
Claim · model-written summary
Forage K increased in early spring as growth increased.
- Taxon
- Tall fescueLolium arundinaceume1
- Outcome
- forage Ke3
- Direction
- increasede3
- Setting
- early springe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville”
e3“As growth increased, forage K increased in early spring”
Claim · model-written summary
Equivalent ratios of K/(Ca + Mg) remained below 2.2.
- Taxon
- Tall fescueLolium arundinaceume1
- Outcome
- Equivalent ratios of K/(Ca + Mg)e4
- Value
- 2.2e4
- Qualifier
- remained below 2.2e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville”
e4“Equivalent ratios of K/(Ca + Mg) closely followed trends of forage K and increased potential for tetany but remained below 2.2”
Claim · model-written summary
Forage Mg concentrations remained low, below 2 g kg-1, through early May.
- Taxon
- Tall fescueLolium arundinaceume1
- Outcome
- Magnesium concentrationse5
- Value
- < 2 g kg −1e5
- Qualifier
- through early Maye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville”
e5“Magnesium concentrations remained low (< 2 g kg −1) in the forage through early May”
Claim · model-written summary
Aluminum and Ca concentrations were usually unaffected by fertilization treatments.
- Taxon
- Tall fescueLolium arundinaceume1
- Treatment
- fertilization treatmentse6
- Outcome
- Aluminum and Ca concentrationse6
- Direction
- no_changeinferrede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville”
e6“Aluminum and Ca concentrations were usually unaffected by fertilization treatments”
Claim · model-written summary
Fertilizing these soils with Mg sources gave no apparent benefit.
- Taxon
- Tall fescueLolium arundinaceume1
- Treatment
- fertilizing these soils with Mg sourcese7
- Outcome
- benefite7
- Direction
- no_changeinferrede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville”
e7“There was no apparent benefit from fertilizing these soils with Mg sources”
Claim · model-written summary
Al concentrations dropped considerably when plant growth was not close to the wet soil surface and standing water was absent.
- Taxon
- Tall fescueLolium arundinaceume1
- Outcome
- Concentrations of Ale2
- Direction
- droppede2
- Setting
- when the plant growth was not close to the wet soil surfacee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville”
e2“Concentrations of Al dropped considerably when the plant growth was not close to the wet soil surface and when standing water was not present”
Claim · model-written summary
Soil Al appears to have adhered to leaves in contact with wet soil or standing water.
- Taxon
- Tall fescueLolium arundinaceume1
- Organ / stage
- leavese2
- Outcome
- soil Al adhered to the leavese2
- Qualifier
- in contact with wet soil or standing watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Tall fescue ( Festuca arundinacea Schreb.) experiments were located at Knoxville”
e2“Apparently, soil Al adhered to the leaves in contact with wet soil or standing water”
The same questions in other papers
magnesium atom · nutrient: content · Lolium arundinaceum (tall fescue)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →fertilization · nutrient: content · Lolium arundinaceum (tall fescue)Positive and negative results
6 papers in the same direction as this paper · 20 in the opposite direction
- positive
- positive
- positive
23 papers more in this group
See all 27 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.