Abstract
Multiple studies have examined the use of chelates to correct pH-induced Fe chlorosis. Here we report the effects of three common chelates on prevention of Fe chlorosis in two sensitive species at high pH. Calibrachoa and soybean were grown in three media pH ranges (6.0 to 6.5, 7.0 to 7.2, and 7.6 to 7.8) and supplied with 1 mg·L −1 Fe as Fe-EDTA, Fe-DTPA, or Fe-EDDHA through fertigation. Chelate effectiveness was quantified by chlorosis rating and dry mass. In Calibrachoa , all three chelates prevented chlorosis at media pH up to 6.5, but above pH 7.2 only Fe-EDDHA was effective. Dry mass decreased as pH increased, but the decrease was less within the Fe-EDDHA treatment. Fe-DTPA was intermediate. There is a wide range in cost: Fe-EDDHA is currently four times, and Fe-DTPA is two times, the cost of Fe-EDTA. Fe-EDDHA binds Fe to pH 9, Fe-DTPA binds to pH 7.5, and Fe-EDTA binds to pH 6.5. Consistent with the stability constants for each chelate, the lower-cost Fe-EDTA chelate was effective in preventing chlorosis in Calibrachoa at media pH below 6.5. We conclude that the additional expense of Fe-DTPA and Fe-EDDHA is only necessary for Calibrachoa when the pH is above 6.5. However, Fe-EDDHA consistently resulted in greater dry mass of soybeans than Fe-EDTA in all pH levels. This suggests that Fe-EDDHA might improve growth of some species, even at a pH below 6.5.
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Claims 8
Claim · model-written summary
All three chelates prevented Calibrachoa chlorosis at media pH up to 6.5.
- Taxon
- Calibrachoa
Calibrachoae0 - Treatment
- Fe-EDTA, Fe-DTPA, or Fe-EDDHAe1
- Outcome
- chlorosise0
- Direction
- preventede0
- Qualifier
- media pH up to 6.5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Calibrachoa , all three chelates prevented chlorosis at media pH up to 6.5”
e1“Fe-EDTA, Fe-DTPA, or Fe-EDDHA”
Claim · model-written summary
Above pH 7.2, only Fe-EDDHA prevented Calibrachoa chlorosis.
- Taxon
- CalibrachoaCalibrachoae1
- Treatment
- Fe-EDDHAe0
- Outcome
- chlorosise1
- Direction
- effectivee0
- Qualifier
- above pH 7.2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“above pH 7.2 only Fe-EDDHA was effective”
e1“In Calibrachoa , all three chelates prevented chlorosis”
Claim · model-written summary
Calibrachoa dry mass decreased as media pH increased.
- Taxon
- CalibrachoaCalibrachoae1
- Treatment
- pHe0
- Outcome
- Dry masse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry mass decreased as pH increased”
e1“In Calibrachoa”
Claim · model-written summary
Fe-EDDHA reduced the dry mass decrease as media pH rose in Calibrachoa.
- Taxon
- CalibrachoaCalibrachoae1
- Treatment
- Fe-EDDHAe0
- Outcome
- Dry masse0
- Direction
- lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry mass decreased as pH increased, but the decrease was less within the Fe-EDDHA treatment”
e1“In Calibrachoa”
Claim · model-written summary
Fe-DTPA had intermediate effectiveness in Calibrachoa.
- Taxon
- CalibrachoaCalibrachoae1
- Outcome
- intermediatee0
- Direction
- intermediatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe-DTPA was intermediate”
e1“In Calibrachoa”
Claim · model-written summary
Fe-EDTA prevented chlorosis in Calibrachoa below media pH 6.5.
- Taxon
- CalibrachoaCalibrachoae0
- Treatment
- Fe-EDTAe0
- Outcome
- chlorosise0
- Direction
- preventinge0
- Qualifier
- media pH below 6.5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe-EDTA chelate was effective in preventing chlorosis in Calibrachoa at media pH below 6.5”
Claim · model-written summary
The authors conclude Fe-DTPA and Fe-EDDHA expense is needed for Calibrachoa only above pH 6.5.
- Taxon
- CalibrachoaCalibrachoae0
- Outcome
- Fe-DTPA and Fe-EDDHA is only necessarye0
- Qualifier
- when the pH is above 6.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“additional expense of Fe-DTPA and Fe-EDDHA is only necessary for Calibrachoa when the pH is above 6.5”
Claim · model-written summary
Fe-EDDHA consistently gave soybeans greater dry mass than Fe-EDTA at all pH levels.
- Taxon
- soybeans
Glycine maxe0 - Treatment
- Fe-EDDHAe0
- Outcome
- dry masse0
- Direction
- greatere0
- Qualifier
- all pH levelse0
- Comparator
- Fe-EDTAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe-EDDHA consistently resulted in greater dry mass of soybeans than Fe-EDTA in all pH levels”
The same questions in other papers
iron atom · growth · Glycine max (soybean)Results differ
28 papers in the same direction as this paper · 11 in the opposite direction
- negative
- no effect
- negative
36 papers more in this group
See all 40 papers →iron atom · physiology: pigments · CalibrachoaResults agree
1 paper in the same direction as this paper
- positive
iron atom · growth · CalibrachoaResults agree
2 papers in the same direction as this paper
- positive
- 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.