Abstract
: A glasshouse pot experiment tested the effects of 14 different combinations of substrate type, pH and nutrient treatments on the occurrence and severity of leaf chlorosis in a susceptible variety of petunia. Plants grown at optimal pH level (4.7) in peat substrate with low limestone dose were symptom-free even without added micronutrients. Severe chlorosis occurred in plants grown at high pH in peat substrate with high limestone (pH 6.7) and in peat-bark-compost (pH 6.2); it was associated with decreased Fe and Mn content in leaves. Regular application of nutrient solution with low concentration of Fe, Mn, and other micronutrients as EDTA chelates greatly reduced chlorosis in plants grown in peat-bark substrate and in peat-bark-compost, and it improved Fe uptake. An exception was peat substrate at high pH level and high limestone where chlorosis was only partially reduced by this treatment. Regular application of Fe, Mn, and other micronutrients as sulphates or citrates had no substantial effect; only application of three additional substrate drenches of 30 mg/l Mn from Mn-EDTA and 90 mg/l Fe from either Fe-EDTA or Fe-EDDHA substantially corrected chlorosis and increased foliar Fe and Mn in cases where plants were grown in high limestone peat substrate.
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Claims 11
Claim · model-written summary
Petunias grown in peat at pH 4.7 with low limestone were symptom-free without micronutrients.
- Treatment
- peat substrate with low limestone dosee0
- Outcome
- symptom-freee0
- Qualifier
- optimal pH level (4.7)e0
_flowers_in_Westgate_Gardens%2C_Canterbury.jpg?width=60){kind=small}
PetuniaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
_flowers_in_Westgate_Gardens%2C_Canterbury.jpg?width=500)
Verbatim
e0“Plants grown at optimal pH level (4.7) in peat substrate with low limestone dose were symptom-free even without added micronutrients.”
t0“petunia plants”
Claim · model-written summary
High-pH peat with high limestone produced severe petunia chlorosis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe chlorosis occurred in plants grown at high pH in peat substrate with high limestone (pH 6.7)”
t0“petunia plants”
Claim · model-written summary
Peat-bark-compost at pH 6.2 produced severe petunia chlorosis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe chlorosis occurred in plants grown at high pH in peat substrate with high limestone (pH 6.7) and in peat-bark-compost (pH 6.2)”
t0“petunia plants”
Claim · model-written summary
Severe chlorosis was associated with lower leaf Fe and Mn content.
- Organ / stage
- leavese0
- Outcome
- Fe and Mn content in leavese0
- Direction
- decreasede0
- Comparator
- Severe chlorosise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was associated with decreased Fe and Mn content in leaves.”
e1“Severe chlorosis occurred in plants”
t0“petunia plants”
Claim · model-written summary
Regular low-dose EDTA-chelated micronutrients greatly reduced petunia chlorosis in peat-bark substrate.
- Treatment
- nutrient solution with low concentration of Fe, Mn, and other micronutrients as EDTA chelatese0
- Outcome
- chlorosise0
- Direction
- reducede0
- Qualifier
- peat-bark substratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regular application of nutrient solution with low concentration of Fe, Mn, and other micronutrients as EDTA chelates greatly reduced chlorosis in plants grown in peat-bark substrate and in peat-bark-compost”
t0“petunia plants”
Claim · model-written summary
Regular low-dose EDTA-chelated micronutrients greatly reduced petunia chlorosis in peat-bark-compost.
- Treatment
- nutrient solution with low concentration of Fe, Mn, and other micronutrients as EDTA chelatese0
- Outcome
- chlorosise0
- Direction
- reducede0
- Qualifier
- peat-bark-composte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regular application of nutrient solution with low concentration of Fe, Mn, and other micronutrients as EDTA chelates greatly reduced chlorosis in plants grown in peat-bark substrate and in peat-bark-compost”
t0“petunia plants”
Claim · model-written summary
EDTA-chelated micronutrients improved Fe uptake.
- Treatment
- nutrient solution with low concentration of Fe, Mn, and other micronutrients as EDTA chelatese1
- Outcome
- Fe uptakee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and it improved Fe uptake.”
e1“Regular application of nutrient solution with low concentration of Fe, Mn, and other micronutrients as EDTA chelates”
t0“petunia plants”
Claim · model-written summary
In high-pH, high-limestone peat, EDTA-chelated micronutrients only partially reduced chlorosis.
- Treatment
- nutrient solution with low concentration of Fe, Mn, and other micronutrients as EDTA chelatese1
- Outcome
- chlorosise0
- Direction
- reducede0
- Qualifier
- peat substrate at high pH level and high limestonee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“peat substrate at high pH level and high limestone where chlorosis was only partially reduced by this treatment.”
e1“Regular application of nutrient solution with low concentration of Fe, Mn, and other micronutrients as EDTA chelates”
t0“petunia plants”
Claim · model-written summary
Regular sulphate or citrate micronutrients had no substantial effect.
- Treatment
- Fe, Mn, and other micronutrients as sulphates or citratese0
- Outcome
- no substantial effecte0
- Direction
- no substantial effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regular application of Fe, Mn, and other micronutrients as sulphates or citrates had no substantial effect”
t0“petunia plants”
Claim · model-written summary
Three extra Mn-EDTA and Fe-EDTA or Fe-EDDHA drenches substantially corrected chlorosis in high-limestone peat.
- Treatment
- three additional substrate drenches of 30 mg/l Mn from Mn-EDTA and 90 mg/l Fe from either Fe-EDTA or Fe-EDDHAe0
- Outcome
- chlorosise0
- Direction
- correctede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only application of three additional substrate drenches of 30 mg/l Mn from Mn-EDTA and 90 mg/l Fe from either Fe-EDTA or Fe-EDDHA substantially corrected chlorosis”
t0“petunia plants”
Claim · model-written summary
Those additional drenches increased foliar Fe and Mn in high-limestone peat.
- Treatment
- three additional substrate drenches of 30 mg/l Mn from Mn-EDTA and 90 mg/l Fe from either Fe-EDTA or Fe-EDDHAe0
- Outcome
- foliar Fe and Mne0
- Direction
- increasede0
- Qualifier
- high limestone peat substratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three additional substrate drenches of 30 mg/l Mn from Mn-EDTA and 90 mg/l Fe from either Fe-EDTA or Fe-EDDHA substantially corrected chlorosis and increased foliar Fe and Mn in cases where plants were grown in high limestone peat substrate.”
t0“petunia plants”
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See all 7 papers →8 of 10 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.