Abstract
Abstract Manganese (Mn) becomes a limiting factor of plant growth under some soil conditions. High pH and abundance of free calcium carbonate in calcareous soils are conducive to Mn‐deficient plants. The Mn status of highly calcareous soils in Iran has not been studied in detail. This experiment was conducted to obtain such information. Twenty‐three surface (0–20 cm) soil samples with pHs from 7.7 to 8.2 and calcium carbonate equivalent (CCE) from 19 to 46% were used in a 7‐week greenhouse study with soybean [Glycine max (L.) Merr.]. The experiment was a 23 × 3 factorial with three replicates, i.e., 23 soils and 3 Mn levels (0, 15, and 30 mg/kg soil as manganese sulfate). Extractable Mn of the untreated soils were determined before planting by nine different procedures. Dry matter yield, Mn concentration of soybean tops, and Mn uptake were used as the measure of plant response. Multiple regression equations showed that the most influencial soil properties in extractability of Mn in highly calcareous soils are cation exchange capacity (CEC) and calcium carbonate equivalent (CCE). Application of Mn increased dry matter, Mn concentration and Mn uptake of soybean plants in most soils. The Mn concentration of plants on some of the soils, however, decreased following the application of Mn. This was attributed to dilution effect caused by enhanced growth. The recovery of applied Mn in all soils was low, persumably due to conversion of the applied Mn to unavailable forms. Regression equations were developed to predict dry matter, Mn concentration, and Mn uptake by plants from soil Mn extracted by water, hydrochloric acid, disodium‐EDTA, and EDTA‐ammonium acetate.
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Claims 9
Claim · model-written summary
CEC and CCE most influenced extractable Mn in highly calcareous soils.
- Taxon
- soybean [Glycine max (L.) Merr.]
Glycine maxe2 - Outcome
- extractability of Mne0
- Setting
- highly calcareous soilse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the most influencial soil properties in extractability of Mn in highly calcareous soils are cation exchange capacity (CEC) and calcium carbonate equivalent (CCE)”
e1“the most influencial soil properties in extractability of Mn in highly calcareous soils are cation exchange capacity (CEC) and calcium carbonate equivalent (CCE)”
e2“greenhouse study with soybean [Glycine max (L.) Merr.]”
Claim · model-written summary
Mn application increased soybean dry matter in most soils.
- Taxon
- soybean plantsGlycine maxe0
- Treatment
- Application of Mne0
- Outcome
- dry mattere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Mn increased dry matter, Mn concentration and Mn uptake of soybean plants in most soils”
Claim · model-written summary
Mn application increased soybean Mn concentration in most soils.
- Taxon
- soybean plantsGlycine maxe0
- Treatment
- Application of Mne0
- Outcome
- Mn concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Mn increased dry matter, Mn concentration and Mn uptake of soybean plants in most soils”
Claim · model-written summary
Mn application increased soybean Mn uptake in most soils.
- Taxon
- soybean plantsGlycine maxe0
- Treatment
- Application of Mne0
- Outcome
- Mn uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Mn increased dry matter, Mn concentration and Mn uptake of soybean plants in most soils”
Claim · model-written summary
Mn application decreased plant Mn concentration in some soils.
- Taxon
- soybeanGlycine maxt0
- Treatment
- application of Mne0
- Outcome
- Mn concentratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Mn concentration of plants on some of the soils, however, decreased following the application of Mn”
t0“soybean”
Claim · model-written summary
The decrease in Mn concentration was attributed to growth dilution.
- Taxon
- soybeanGlycine maxt0
- Outcome
- Mn concentratione2
- Qualifier
- dilution effect caused by enhanced growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was attributed to dilution effect caused by enhanced growth”
t0“soybean”
e1“This was attributed to dilution effect caused by enhanced growth”
e2“Application of Mn increased dry matter, Mn concentration and Mn uptake of soybean plants in most soils”
Claim · model-written summary
Recovery of applied Mn was low across all soils.
- Taxon
- soybeanGlycine maxt0
- Outcome
- recovery of applied Mne0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The recovery of applied Mn in all soils was low”
t0“soybean”
Claim · model-written summary
Low Mn recovery was attributed to conversion to unavailable forms.
- Taxon
- soybeanGlycine maxt0
- Outcome
- recovery of applied Mne2
- Qualifier
- conversion of the applied Mn to unavailable formse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“persumably due to conversion of the applied Mn to unavailable forms”
t0“soybean”
e1“persumably due to conversion of the applied Mn to unavailable forms”
e2“The recovery of applied Mn in all soils was low”
Claim · model-written summary
Regression equations were developed to predict plant dry matter, Mn concentration and Mn uptake from extracted soil Mn.
- Taxon
- soybeanGlycine maxt0
- Outcome
- dry matter, Mn concentration, and Mn uptake by plantse0
- Comparator
- soil Mn extracted by water, hydrochloric acid, disodium‐EDTA, and EDTA‐ammonium acetatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regression equations were developed to predict dry matter, Mn concentration, and Mn uptake by plants from soil Mn extracted by water, hydrochloric acid, disodium‐EDTA, and EDTA‐ammonium acetate”
t0“soybean”
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See all 32 papers →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.