Abstract
Abstract Glycine max (L.) Merr. cv Essex was grown hydroponically in a greenhouse in a factorial combination of 4 levels of P (6.5, 13, 26 and 52 μM P) ‐2 ‐1 and 2 levels of ultraviolet‐B (0 and 2500 J m day biologically effective UV‐B) radiation. Plants were grown through the full expansion of the 4th trifoliolate leaf. Decreased supply of P decreased plant biomass, and the uptake and concentration of other macronutrients. Decreased P supply also reduced allocation of biomass to leaves and stems but increased allocation to roots. The effect of UV‐B radiation depended upon P supply. At the lowest P supply (6.5 μM) UV‐B radiation did not affect any of the parameters measured, except biomass allocation. UV‐B radiation increased biomass allocation to leaves but decreased allocation to stems and roots. At higher levels of P supply, UV‐B radiation significantly decreased plant bioraass, uptake of Ca and Mg, and increased concentrations of N, P, K, and Mg in plant dry matter. UV‐B radiation did not affect the uptake of N, P, K nor Ca concentration. The effects of P supply and UV‐B on nutrient concentration and uptake was through its indirect effect on dry matter production and allocation, and anion‐cation balancing.
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Claims 12
Claim · model-written summary
Reduced phosphorus supply decreased soybean biomass.
Not reportedTaxonComparator
Verbatim
e0“Decreased supply of P decreased plant biomass, and the uptake and concentration of other macronutrients.”
t0“soybean”
Claim · model-written summary
Reduced phosphorus supply decreased macronutrient uptake and concentration.
- Treatment
- Decreased supply of Pe0
- Outcome
- uptake and concentration of other macronutrientse0
- Direction
- decreasede0
Not reportedTaxonComparator
Verbatim
e0“Decreased supply of P decreased plant biomass, and the uptake and concentration of other macronutrients.”
t0“soybean”
Claim · model-written summary
Reduced phosphorus supply decreased biomass allocation to leaves and stems.
Not reportedTaxonComparator
Verbatim
e0“Decreased P supply also reduced allocation of biomass to leaves and stems but increased allocation to roots.”
t0“soybean”
Claim · model-written summary
Reduced phosphorus supply increased biomass allocation to roots.
Not reportedTaxonComparator
Verbatim
e0“Decreased P supply also reduced allocation of biomass to leaves and stems but increased allocation to roots.”
t0“soybean”
Claim · model-written summary
At the lowest phosphorus supply UV-B did not affect measured parameters except allocation.
- Treatment
- UV‐B radiatione0
- Outcome
- parameters measurede0
- Direction
- did not affecte0
- Qualifier
- lowest P supply (6.5 μM)e0
Not reportedTaxonComparator
Verbatim
e0“At the lowest P supply (6.5 μM) UV‐B radiation did not affect any of the parameters measured, except biomass allocation.”
t0“soybean”
Claim · model-written summary
UV-B increased biomass allocation to leaves.
Not reportedTaxonComparator
Verbatim
e0“UV‐B radiation increased biomass allocation to leaves but decreased allocation to stems and roots.”
t0“soybean”
Claim · model-written summary
UV-B decreased biomass allocation to stems and roots.
Not reportedTaxonComparator
Verbatim
e0“UV‐B radiation increased biomass allocation to leaves but decreased allocation to stems and roots.”
t0“soybean”
Claim · model-written summary
At higher phosphorus supply UV-B significantly decreased biomass.
- Treatment
- UV‐B radiatione0
- Outcome
- plant bioraasse0
- Direction
- decreasede0
- Qualifier
- higher levels of P supplye0
Not reportedTaxonComparator
Verbatim
e0“At higher levels of P supply, UV‐B radiation significantly decreased plant bioraass, uptake of Ca and Mg, and increased concentrations of N, P, K, and Mg in plant dry matter.”
t0“soybean”
Claim · model-written summary
At higher phosphorus supply UV-B significantly decreased calcium and magnesium uptake.
Not reportedTaxonComparator
Verbatim
e0“At higher levels of P supply, UV‐B radiation significantly decreased plant bioraass, uptake of Ca and Mg, and increased concentrations of N, P, K, and Mg in plant dry matter.”
t0“soybean”
Claim · model-written summary
At higher phosphorus supply UV-B increased nitrogen, phosphorus, potassium and magnesium concentrations in dry matter.
- Treatment
- UV‐B radiatione0
- Outcome
- concentrations of N, P, K, and Mg in plant dry mattere0
- Direction
- increasede0
Not reportedTaxonComparator
Verbatim
e0“At higher levels of P supply, UV‐B radiation significantly decreased plant bioraass, uptake of Ca and Mg, and increased concentrations of N, P, K, and Mg in plant dry matter.”
t0“soybean”
Claim · model-written summary
UV-B did not affect nitrogen, phosphorus or potassium uptake or calcium concentration.
Not reportedTaxonComparator
Verbatim
e0“UV‐B radiation did not affect the uptake of N, P, K nor Ca concentration.”
t0“soybean”
Claim · model-written summary
The authors attributed nutrient changes to dry matter production, allocation and ion balancing.
- Outcome
- nutrient concentration and uptakee0
- Qualifier
- dry matter production and allocation, and anion‐cation balancinge0
Not reportedTaxon
Verbatim
e0“The effects of P supply and UV‐B on nutrient concentration and uptake was through its indirect effect on dry matter production and allocation, and anion‐cation balancing.”
t0“soybean”