Abstract
The effect of various concentrations and ratios of iron (Fe) and manganese (Mn) chelates on growth, micronutrient uptake and chlorophyll content was investigated in a glasshouse experiment using potted petunia plants. The plants were cultivated in a peat substrate amended with dolomitic limestone at rate of 3.0 g/L (control substrate) or 12.0 g/L. The higher rate was established both to restrict the uptake of Fe, Mn and other nutrients and also to test the effectiveness of various Fe and Mn treatments. The plants in all the treatments were fertigated at weekly intervals with a nutrient solution containing macronutrients and micronutrients. Various chelate forms of Fe and Mn were used with the exception of two treatments where these two elements were omitted. The effects of different substrate pH levels (derived from different limestone contents) had a large effect on plant growth, chlorophyll content and content of Fe and Mn accumulated in the plant leaves. The plants in the high-limestone substrate devoid of Fe and Mn had reduced growth and lower chlorophyll content. They also had lower leaf Fe and Mn content than the control plants in the R3 substrate. Regular fertigation with a nutrient solution containing Mn and Fe improved plant growth rate and also increased chlorophyll content. However, its efficiency depended on the chelate form and concentration used. The effect of chelate application on the Fe and Mn leaf content was unclear as it only marginally increased leaf Fe absorption in some treatments. No effect of the various Fe/Mn ratios was observed.
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Claims 5
Claim · model-written summary
High-limestone substrate without Fe and Mn reduced petunia growth and chlorophyll content.
- Treatment
- high-limestone substrate devoid of Fe and Mne0
- Outcome
- growth and lower chlorophyll contente0
- Direction
- reducede0
_flowers_in_Westgate_Gardens%2C_Canterbury.jpg?width=60){kind=small}
PetuniaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_flowers_in_Westgate_Gardens%2C_Canterbury.jpg?width=500)
Verbatim
t0“petunia plants”
e0“The plants in the high-limestone substrate devoid of Fe and Mn had reduced growth and lower chlorophyll content.”
Claim · model-written summary
High-limestone substrate without Fe and Mn lowered leaf Fe and Mn content relative to controls.
- Organ / stage
- leafe0
- Treatment
- high-limestone substrate devoid of Fe and Mne0
- Outcome
- leaf Fe and Mn contente0
- Direction
- lowere0
- Comparator
- control plants in the R3 substratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“petunia plants”
e0“The plants in the high-limestone substrate devoid of Fe and Mn had reduced growth and lower chlorophyll content. They also had lower leaf Fe and Mn content than the control plants in the R3 substrate.”
Claim · model-written summary
Fe and Mn fertigation improved petunia growth rate and increased chlorophyll content, with efficacy dependent on chelate form and concentration.
- Treatment
- Regular fertigation with a nutrient solution containing Mn and Fee0
- Outcome
- plant growth rate and also increased chlorophyll contente0
- Direction
- improvede0
- Qualifier
- chelate form and concentratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“petunia plants”
e0“Regular fertigation with a nutrient solution containing Mn and Fe improved plant growth rate and also increased chlorophyll content. However, its efficiency depended on the chelate form and concentration used.”
Claim · model-written summary
Chelate application marginally increased leaf Fe absorption in some treatments.
- Treatment
- chelate applicatione0
- Outcome
- leaf Fe absorptione0
- Direction
- increasede0
- Qualifier
- some treatmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“petunia plants”
e0“The effect of chelate application on the Fe and Mn leaf content was unclear as it only marginally increased leaf Fe absorption in some treatments.”
Claim · model-written summary
Different Fe/Mn ratios showed no observed effect.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“petunia plants”
e0“No effect of the various Fe/Mn ratios was observed.”
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