Abstract
Abstract Iron‐EDTA (Fe‐EDTA), ferrous sulfate (FeSO4), and a combination of both (50:50) were coated with a natural resin material and tested in a concentration of 75 and 100 mg Fe/kg soil, respectively, for three years in pot experiments with the susceptible grape (Vitis vinifera L.) vine rootstock Couderc 3309. In 1990, two locations in the field were fertilized with coated Fe‐EDTA. The application of coated Fe‐EDTA increased the iron (Fe) content in the youngest leaves about 10% and the chlorophyll content about 71% compared to the three year average values of the untreated plants. The most obvious effect was a better growth, which resulted in a higher dry weight and a greater Fe uptake in the leaves and shoots. Organic acids decreased about 11% and chlorosis symptoms, as in untreated plants, did not appear. By itself, FeSO4 was only applied in the first year, after which chlorosis symptoms occured. The combination of Fe‐EDTA and FeSO4 resulted in an increase of iron content, dry weight, Fe uptake and chlorophyll content and a slight decrease of organic acids. All data except the Fe content were higher by singly applying coated Fe‐EDTA. At one location of chlorotic plants under field conditions coated Fe‐EDTA (8% Fe), applied in the amount of 15 g and 30 g per plant increased chlorophyll content as well. As no chlorosis occured at the second location chlorophyll and Fe content remained unchanged. It was concluded that coated Fe‐EDTA may serve as an Fe fertilizer if the water supply is sufficient.
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Claims 14
Claim · model-written summary
Coated Fe EDTA raised leaf iron content about 10% versus untreated plants.
Verbatim
e0“The application of coated Fe‐EDTA increased the iron (Fe) content in the youngest leaves about 10% and the chlorophyll content about 71% compared to the three year average values of the untreated plants.”
t0“grape”
Claim · model-written summary
Coated Fe EDTA raised chlorophyll content about 71% versus untreated plants.
Verbatim
e0“The application of coated Fe‐EDTA increased the iron (Fe) content in the youngest leaves about 10% and the chlorophyll content about 71% compared to the three year average values of the untreated plants.”
t0“grape”
Claim · model-written summary
Coated Fe EDTA improved growth and dry weight.
- Taxon
- grapet0
- Treatment
- coated Fe‐EDTAe1
- Outcome
- growth, which resulted in a higher dry weighte0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“The most obvious effect was a better growth, which resulted in a higher dry weight and a greater Fe uptake in the leaves and shoots.”
t0“grape”
e1“The application of coated Fe‐EDTA increased the iron (Fe) content in the youngest leaves about 10% and the chlorophyll content about 71% compared to the three year average values of the untreated plants.”
Claim · model-written summary
Coated Fe EDTA increased iron uptake in leaves and shoots.
- Taxon
- grapet0
- Organ / stage
- leaves and shootse0
- Treatment
- iron fertilizerst1
- Outcome
- Fe uptakee0
- Direction
- greatere0
Not reportedComparator
Verbatim
e0“a greater Fe uptake in the leaves and shoots.”
t0“grape”
t1“iron fertilizers”
Claim · model-written summary
Organic acids decreased about 11%.
Not reportedComparator
Verbatim
e0“Organic acids decreased about 11% and chlorosis symptoms, as in untreated plants, did not appear.”
t0“grape”
t1“iron fertilizers”
Claim · model-written summary
Chlorosis symptoms did not appear in treated and untreated plants.
Verbatim
e0“chlorosis symptoms, as in untreated plants, did not appear.”
t0“grape”
Claim · model-written summary
FeSO4 treatment led to chlorosis symptoms after application only in the first year.
Verbatim
e0“By itself, FeSO4 was only applied in the first year, after which chlorosis symptoms occured.”
t0“grape”
Claim · model-written summary
Combined Fe EDTA and FeSO4 increased iron content, dry weight and iron uptake.
- Taxon
- grapet0
- Treatment
- combination of Fe‐EDTA and FeSO4e0
- Outcome
- iron content, dry weight, Fe uptakee0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“The combination of Fe‐EDTA and FeSO4 resulted in an increase of iron content, dry weight, Fe uptake and chlorophyll content and a slight decrease of organic acids.”
t0“grape”
Claim · model-written summary
Combined Fe EDTA and FeSO4 increased chlorophyll content.
- Taxon
- grapet0
- Treatment
- combination of Fe‐EDTA and FeSO4e0
- Outcome
- chlorophyll contente0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“The combination of Fe‐EDTA and FeSO4 resulted in an increase of iron content, dry weight, Fe uptake and chlorophyll content and a slight decrease of organic acids.”
t0“grape”
Claim · model-written summary
Combined Fe EDTA and FeSO4 slightly decreased organic acids.
Not reportedComparator
Verbatim
e0“The combination of Fe‐EDTA and FeSO4 resulted in an increase of iron content, dry weight, Fe uptake and chlorophyll content and a slight decrease of organic acids.”
t0“grape”
Claim · model-written summary
Singly applied coated Fe EDTA gave higher measures than the combination except for iron content.
Not reportedComparator
Verbatim
e0“All data except the Fe content were higher by singly applying coated Fe‐EDTA.”
t0“grape”
Claim · model-written summary
Coated Fe EDTA raised chlorophyll content in chlorotic field plants.
- Taxon
- grapet0
- Treatment
- coated Fe‐EDTA (8% Fe), applied in the amount of 15 g and 30 g per plante0
- Outcome
- chlorophyll contente0
- Direction
- increasede0
- Setting
- field conditionse0
Not reportedComparator
Verbatim
e0“At one location of chlorotic plants under field conditions coated Fe‐EDTA (8% Fe), applied in the amount of 15 g and 30 g per plant increased chlorophyll content as well.”
t0“grape”
Claim · model-written summary
At the second location chlorophyll and iron content remained unchanged where chlorosis was absent.
Verbatim
e0“As no chlorosis occured at the second location chlorophyll and Fe content remained unchanged.”
t0“grape”
Claim · model-written summary
The authors recommend coated Fe EDTA as fertilizer when water is sufficient.
Verbatim
e0“It was concluded that coated Fe‐EDTA may serve as an Fe fertilizer if the water supply is sufficient.”
t0“grape”
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