Abstract
Abstract The effect of soil and foliar application of different iron (Fe) compounds (FeSO 4 , Fe‐EDTA, Fe‐EDDS, and Fe‐EDDHA) on nutrient concentrations in lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego) was investigated in a greenhouse pot experiment using quartz sand as growth medium. Soil application was performed in both the acidic and alkaline pH range, and foliar application to plants grown in the alkaline sand only. Lettuce growth was depressed by Fe deficiency in the alkaline sand, whereas the treatments had no effect on ryegrass growth. Soil‐applied Fe compounds raised the Fe concentrations in lettuce. This was especially true for the Fe chelates, which also increased yields. Soil‐applied Fe compounds had no statistically significant effect on Fe concentrations in ryegrass. Concentrations of manganese (Mn) in lettuce were equally decreased by all soil‐applied chelates. In the alkaline sand, soil application of Fe‐EDDHA elevated copper (Cu) and depressed zinc (Zn) concentrations in lettuce. The chelates increased Zn concentration in ryegrass. Foliar application of Fe‐EDDS increased Fe concentrations in lettuce and in ryegrass most. Fe‐EDDHA depressed Mn and Zn concentrations in lettuce more than other Fe compounds, suggesting the existence of another mechanism, in addition to Fe, that transmits a corresponding signal from shoot to roots with an impact on uptake of micronutrients.
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Claims 13
Claim · model-written summary
Lettuce growth was depressed by Fe deficiency in the alkaline sand.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- Fe deficiencye2
- Outcome
- growthe2
- Direction
- depressede2
- Setting
- greenhouse pot experimente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“Lettuce growth was depressed by Fe deficiency in the alkaline sand, whereas the treatments had no effect on ryegrass growth”
Claim · model-written summary
The Fe compound treatments had no effect on ryegrass growth.
LoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“Lettuce growth was depressed by Fe deficiency in the alkaline sand, whereas the treatments had no effect on ryegrass growth”
Claim · model-written summary
Soil-applied Fe compounds raised Fe concentrations in lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Fe compoundse2
- Outcome
- Fe concentrationse2
- Direction
- raisede2
- Setting
- greenhouse pot experimente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“Fe compounds raised the Fe concentrations in lettuce”
Claim · model-written summary
The Fe chelates also increased lettuce yields.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Fe chelatese2
- Outcome
- yieldse2
- Direction
- increasede2
- Setting
- greenhouse pot experimente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“This was especially true for the Fe chelates, which also increased yields”
Claim · model-written summary
Soil-applied Fe compounds had no statistically significant effect on Fe concentrations in ryegrass.
- Treatment
- Fe compoundse2
- Outcome
- Fe concentrationse2
- Direction
- no statistically significant effecte2
- Setting
- greenhouse pot experimente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“Fe compounds had no statistically significant effect on Fe concentrations in ryegrass”
Claim · model-written summary
All soil-applied chelates equally decreased Mn concentrations in lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- chelatese2
- Outcome
- Concentrations of manganese (Mn)e2
- Direction
- decreasede2
- Qualifier
- equallye2
- Setting
- greenhouse pot experimente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“Concentrations of manganese (Mn) in lettuce were equally decreased by all soil‐applied chelates”
Claim · model-written summary
In alkaline sand, soil application of Fe-EDDHA elevated Cu concentrations in lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- soil application of Fe‐EDDHAe2
- Outcome
- copper (Cu)e2
- Direction
- elevatede2
- Setting
- alkaline sande2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“In the alkaline sand, soil application of Fe‐EDDHA elevated copper (Cu) and depressed zinc (Zn) concentrations in lettuce.”
Claim · model-written summary
In alkaline sand, soil application of Fe-EDDHA depressed Zn concentrations in lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- soil application of Fe‐EDDHAe2
- Outcome
- zinc (Zn) concentrationse2
- Direction
- depressede2
- Setting
- alkaline sande2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“In the alkaline sand, soil application of Fe‐EDDHA elevated copper (Cu) and depressed zinc (Zn) concentrations in lettuce.”
Claim · model-written summary
The chelates increased Zn concentration in ryegrass.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“The chelates increased Zn concentration in ryegrass”
Claim · model-written summary
Foliar application of Fe-EDDS increased Fe concentrations in lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Foliar application of Fe‐EDDSe2
- Outcome
- Fe concentrationse2
- Direction
- increasede2
- Setting
- greenhouse pot experimente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“Foliar application of Fe‐EDDS increased Fe concentrations in lettuce and in ryegrass most”
Claim · model-written summary
Foliar application of Fe-EDDS increased Fe concentrations in ryegrass most of the compounds tested.
- Treatment
- Foliar application of Fe‐EDDSe2
- Outcome
- Fe concentrationse2
- Direction
- increasede2
- Qualifier
- moste2
- Setting
- greenhouse pot experimente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“Foliar application of Fe‐EDDS increased Fe concentrations in lettuce and in ryegrass most”
Claim · model-written summary
Fe-EDDHA depressed Mn and Zn concentrations in lettuce more than other Fe compounds did.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Fe‐EDDHAe2
- Outcome
- Mn and Zn concentrationse2
- Direction
- depressede2
- Comparator
- other Fe compoundse2
- Setting
- greenhouse pot experimente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e1“was investigated in a greenhouse pot experiment using quartz sand as growth medium”
e2“Fe‐EDDHA depressed Mn and Zn concentrations in lettuce more than other Fe compounds”
Claim · model-written summary
The authors suggest another mechanism, in addition to Fe, transmits a signal from shoot to roots that affects micronutrient uptake in lettuce.
- Taxon
- lettuceLactuca sativae0
- Outcome
- uptake of micronutrientse2
- Qualifier
- another mechanism, in addition to Fe, that transmits a corresponding signal from shoot to rootse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce ( Lactuca sativa cv. Australian gelber) and ryegrass ( Lolium perenne cv. Prego)”
e2“suggesting the existence of another mechanism, in addition to Fe, that transmits a corresponding signal from shoot to roots with an impact on uptake of micronutrients”
The same questions in other papers
iron atom · yield · Lactuca sativa (garden lettuce)Results differ
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
iron atom · growth · Lactuca sativa (garden lettuce)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- positive
2 papers more in this group
See all 6 papers →iron atom · nutrient: content · LoliumResults agree
1 paper in the same direction as this paper
- no effect
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.