Abstract
Abstract Iron (Fe) deficiency chlorosis is a widespread problem for soybean [Glycine max L.(Merr.)] production in the North Central region of the United States. Fertilization options are limited due to the high cost of soil-applied chelates, and inconsistent crop response to foliar sprays. The objective of this study was to evaluate the response of soybean to several inorganic and organic Fe sources applied alone or coated with Polyon® organic polymers. Three greenhouse experiments were performed, using an alkaline Ulen sandy loam soil. Chlorosis was severe in all three experiments. Most of the products tested, such as uncoated ferrous sulfate, polymer-coated ferrous sulfate, or polymer-coated urea-ferrous sulfate, gave small increases in leaf chlorophyll content at the unifoliate or first trifoliolate stage, but not at the second or third trifoliolate stages. The most dramatic increases in leaf chlorophyll content and dry matter production were observed when the soil was amended with uncoated FeEDDHA or with a polymer-coated mixture of ferrous sulfate, ammonium sulfate, and citric acid. It was concluded that polymer-coated ferrous sulfate-ammonium sulfate-citric acid deserves further evaluation. Keywords: SoybeanIron deficiency chlorosisSlow-release fertilizersFerrous sulfateChelatesDTPAEDDHA
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Claims 7
Claim · model-written summary
Uncoated ferrous sulfate gave small increases in soybean leaf chlorophyll content at the unifoliate or first trifoliolate stage.
- Taxon
- soybean
Glycine maxe0 - Organ / stage
- unifoliate or first trifoliolate stagee2
- Treatment
- uncoated ferrous sulfatee2
- Outcome
- leaf chlorophyll contente2
- Direction
- small increasese2
- Setting
- greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron (Fe) deficiency chlorosis is a widespread problem for soybean [Glycine max L.(Merr.)] production in the North Central region of the United States”
e1“Three greenhouse experiments were performed, using an alkaline Ulen sandy loam soil”
e2“Most of the products tested, such as uncoated ferrous sulfate, polymer-coated ferrous sulfate, or polymer-coated urea-ferrous sulfate, gave small increases in leaf chlorophyll content at the unifoliate or first trifoliolate stage, but not at the second or third trifoliolate stages”
Claim · model-written summary
Polymer-coated ferrous sulfate gave small increases in soybean leaf chlorophyll content at the unifoliate or first trifoliolate stage.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- unifoliate or first trifoliolate stagee2
- Treatment
- polymer-coated ferrous sulfatee2
- Outcome
- leaf chlorophyll contente2
- Direction
- small increasese2
- Setting
- greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron (Fe) deficiency chlorosis is a widespread problem for soybean [Glycine max L.(Merr.)] production in the North Central region of the United States”
e1“Three greenhouse experiments were performed, using an alkaline Ulen sandy loam soil”
e2“Most of the products tested, such as uncoated ferrous sulfate, polymer-coated ferrous sulfate, or polymer-coated urea-ferrous sulfate, gave small increases in leaf chlorophyll content at the unifoliate or first trifoliolate stage, but not at the second or third trifoliolate stages”
Claim · model-written summary
Polymer-coated urea-ferrous sulfate gave small increases in soybean leaf chlorophyll content at the unifoliate or first trifoliolate stage.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- unifoliate or first trifoliolate stagee2
- Treatment
- polymer-coated urea-ferrous sulfatee2
- Outcome
- leaf chlorophyll contente2
- Direction
- small increasese2
- Setting
- greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron (Fe) deficiency chlorosis is a widespread problem for soybean [Glycine max L.(Merr.)] production in the North Central region of the United States”
e1“Three greenhouse experiments were performed, using an alkaline Ulen sandy loam soil”
e2“Most of the products tested, such as uncoated ferrous sulfate, polymer-coated ferrous sulfate, or polymer-coated urea-ferrous sulfate, gave small increases in leaf chlorophyll content at the unifoliate or first trifoliolate stage, but not at the second or third trifoliolate stages”
Claim · model-written summary
Most of the tested iron products did not increase soybean leaf chlorophyll content at the second or third trifoliolate stages.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- second or third trifoliolate stagese2
- Treatment
- Most of the products testede2
- Outcome
- leaf chlorophyll contente2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron (Fe) deficiency chlorosis is a widespread problem for soybean [Glycine max L.(Merr.)] production in the North Central region of the United States”
e2“Most of the products tested, such as uncoated ferrous sulfate, polymer-coated ferrous sulfate, or polymer-coated urea-ferrous sulfate, gave small increases in leaf chlorophyll content at the unifoliate or first trifoliolate stage, but not at the second or third trifoliolate stages”
Claim · model-written summary
Uncoated FeEDDHA gave the most dramatic increases in soybean leaf chlorophyll content and dry matter production.
- Taxon
- soybeanGlycine maxe0
- Treatment
- uncoated FeEDDHAe3
- Outcome
- leaf chlorophyll content and dry matter productione3
- Direction
- most dramatic increasese3
- Setting
- greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron (Fe) deficiency chlorosis is a widespread problem for soybean [Glycine max L.(Merr.)] production in the North Central region of the United States”
e1“Three greenhouse experiments were performed, using an alkaline Ulen sandy loam soil”
e3“The most dramatic increases in leaf chlorophyll content and dry matter production were observed when the soil was amended with uncoated FeEDDHA or with a polymer-coated mixture of ferrous sulfate, ammonium sulfate, and citric acid”
Claim · model-written summary
A polymer-coated mixture of ferrous sulfate, ammonium sulfate and citric acid gave the most dramatic increases in soybean leaf chlorophyll content and dry matter production.
- Taxon
- soybeanGlycine maxe0
- Treatment
- polymer-coated mixture of ferrous sulfate, ammonium sulfate, and citric acide3
- Outcome
- leaf chlorophyll content and dry matter productione3
- Direction
- most dramatic increasese3
- Setting
- greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron (Fe) deficiency chlorosis is a widespread problem for soybean [Glycine max L.(Merr.)] production in the North Central region of the United States”
e1“Three greenhouse experiments were performed, using an alkaline Ulen sandy loam soil”
e3“The most dramatic increases in leaf chlorophyll content and dry matter production were observed when the soil was amended with uncoated FeEDDHA or with a polymer-coated mixture of ferrous sulfate, ammonium sulfate, and citric acid”
Claim · model-written summary
The polymer-coated ferrous sulfate-ammonium sulfate-citric acid product deserves further evaluation for soybean.
- Taxon
- soybeanGlycine maxe0
- Treatment
- polymer-coated ferrous sulfate-ammonium sulfate-citric acide4
- Outcome
- deserves further evaluatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron (Fe) deficiency chlorosis is a widespread problem for soybean [Glycine max L.(Merr.)] production in the North Central region of the United States”
e4“It was concluded that polymer-coated ferrous sulfate-ammonium sulfate-citric acid deserves further evaluation”
The same questions in other papers
citric acid · physiology: pigments · Glycine max (soybean)Positive and negative results
2 in the opposite direction
- negative
- no effect
sulfate · physiology: pigments · Glycine max (soybean)Results agree
1 paper in the same direction as this paper
- positive
iron(2+) sulfate (anhydrous) · physiology: pigments · Glycine max (soybean)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →nitrogen · physiology: pigments · Glycine max (soybean)Positive and negative results
11 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
10 papers more in this group
See all 14 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.