Abstract
Abstract Short‐term, split‐root experiments were conducted in a growth chamber with ‘Lee’ soybeans ( Glycine max ). The upper portion of the root medium was a limed, fertilized sandy loam surface soil; the lower portion was a nutrient solution. Calcium concentration of 0.25 ppm was sufficient to obtain maximum growth rates in a nutrient solution at pH 5.6. More than 2.5 ppm of Ca was required at a solution pH of 4.5, and 5 ppm of Ca was insufficient when the pH was 4.0. High concentrations of Mg [ratios of Ca/(Ca + Mg) of 0.1 or less] also reduced growth. Replacing half of the Mg with K at low ratios of Ca/total cations produced more rapid elongation than the Ca + Mg systems, but had no effect at the higher ratios. Aluminum in the nutrient solution reduced root growth when the ratio of activities of Al to Ca was greater than 0.02.
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Claims 7
Claim · model-written summary
At pH 5.6, 0.25 ppm calcium was sufficient for maximum soybean root growth rates.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Calcium concentratione0
- Outcome
- maximum growth ratese0
- Direction
- maximume0
- Value
- 0.25 ppme0
- Qualifier
- pH 5.6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calcium concentration of 0.25 ppm was sufficient to obtain maximum growth rates in a nutrient solution at pH 5.6”
t0“Soybean”
Claim · model-written summary
At pH 4.5, more than 2.5 ppm calcium was required for soybean root growth.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“More than 2.5 ppm of Ca was required at a solution pH of 4.5”
t0“Soybean”
Claim · model-written summary
At pH 4.0, 5 ppm calcium was insufficient for soybean root growth.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“5 ppm of Ca was insufficient when the pH was 4.0”
t0“Soybean”
Claim · model-written summary
High magnesium concentration at calcium-to-calcium-plus-magnesium ratios of 0.1 or less reduced root growth.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- High concentrations of Mge0
- Outcome
- growthe0
- Direction
- reducede0
- Qualifier
- ratios of Ca/(Ca + Mg) of 0.1 or lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High concentrations of Mg [ratios of Ca/(Ca + Mg) of 0.1 or less] also reduced growth”
t0“Soybean”
Claim · model-written summary
At low calcium-to-total-cation ratios, replacing half the magnesium with potassium increased root elongation versus calcium and magnesium solutions.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Replacing half of the Mg with Ke0
- Outcome
- elongatione0
- Direction
- more rapide0
- Qualifier
- low ratios of Ca/total cationse0
- Comparator
- Ca + Mg systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Replacing half of the Mg with K at low ratios of Ca/total cations produced more rapid elongation than the Ca + Mg systems”
t0“Soybean”
Claim · model-written summary
At higher calcium-to-total-cation ratios, replacing half the magnesium with potassium had no effect on root elongation.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Replacing half of the Mg with Ke0
- Outcome
- elongatione0
- Direction
- no effecte0
- Qualifier
- higher ratiose0
- Comparator
- Ca + Mg systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Replacing half of the Mg with K at low ratios of Ca/total cations produced more rapid elongation than the Ca + Mg systems, but had no effect at the higher ratios”
t0“Soybean”
Claim · model-written summary
Aluminum reduced soybean root growth when the aluminum-to-calcium activity ratio exceeded 0.02.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Aluminum in the nutrient solutione0
- Outcome
- root growthe0
- Direction
- reducede0
- Qualifier
- ratio of activities of Al to Ca was greater than 0.02e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aluminum in the nutrient solution reduced root growth when the ratio of activities of Al to Ca was greater than 0.02”
t0“Soybean”
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