Abstract
Abstract Irradiance and soil nitrogen effects on growth, net photosynthesis and radiation use efficiency (RUE) of B rachiaria decumbens were investigated in fertilized and non‐fertilized stands. Three levels of photosynthetic photon flux ( PPF : S 0 = 100%, S 1 = 50% and S 2 = 30%) and two N supplies, with ( N +) and without ( N −), were used. Forage biomass and nutrient accumulation, specific leaf area ( SLA ), leaf area index ( LAI ), fractional intercepted photosynthetic photon flux (f PPF ), leaf photosynthetic response to light and efficiency of radiation use at leaf ( A / Q ) and canopy ( RUE ) levels were measured. Shade effects were mostly independent of soil N . Final yield was decreased by 34% ( S 1) and 57% ( S 2). Shade increased SLA (25–46%), so maximum LAI (2·4–3·3) was similar among light regimes. In N − stands, reductions in leaf biomass (14%), SLA (17%) and LAI (27%) were recorded, although forage yield was similar between soil N conditions. Under shade, peaks of A were comparable to those at full light, so A / Q was higher around midday. Derived parameters of the A ‐ PPF curves were similar between S 0 and S 2. A maximum f PPF = 0·8 ( S 0 N +, S 1 N +) was recorded at LAI = 3–4. Under limited sunlight, relatively high RUE (1·6–2·8 g MJ −1 ) were observed over both soil N conditions. We concluded that B . decumbens had a high plasticity to shade, thus explaining its success under silvopastoral systems.
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Claims 15
Claim · model-written summary
Shade effects on B. decumbens were mostly independent of soil N.
- Taxon
- Brachiaria decumbens
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Urochloa decumbenst0 - Outcome
- Shade effectse0
- Qualifier
- mostly independent of soil Ne0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Brachiaria decumbens”
e0“Shade effects were mostly independent of soil N”
Claim · model-written summary
Final yield of B. decumbens decreased by 34% under S1 shade (50% PPF) relative to full light.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- S 1e1
- Outcome
- Final yielde1
- Direction
- decreasede1
- Value
- 34%e1
- Comparator
- S 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“Three levels of photosynthetic photon flux ( PPF : S 0 = 100%, S 1 = 50% and S 2 = 30%)”
e1“Final yield was decreased by 34% ( S 1) and 57% ( S 2)”
Claim · model-written summary
Final yield of B. decumbens decreased by 57% under S2 shade (30% PPF) relative to full light.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- S 2e1
- Outcome
- Final yielde1
- Direction
- decreasede1
- Value
- 57%e1
- Comparator
- S 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“Three levels of photosynthetic photon flux ( PPF : S 0 = 100%, S 1 = 50% and S 2 = 30%)”
e1“Final yield was decreased by 34% ( S 1) and 57% ( S 2)”
Claim · model-written summary
Shade increased specific leaf area of B. decumbens by 25-46%.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- Shadee0
- Outcome
- SLAe0
- Direction
- increasede0
- Value
- 25–46%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“Shade increased SLA (25–46%)”
Claim · model-written summary
Maximum LAI (2.4-3.3) of B. decumbens was similar among light regimes.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- light regimese0
- Outcome
- maximum LAIe0
- Direction
- similare0
- Value
- 2·4–3·3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“so maximum LAI (2·4–3·3) was similar among light regimes”
Claim · model-written summary
Leaf biomass of B. decumbens was reduced by 14% in N-free stands.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- N −e1
- Outcome
- leaf biomasse1
- Direction
- reductionse1
- Value
- 14%e1
- Comparator
- N +e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“two N supplies, with ( N +) and without ( N −)”
e1“In N − stands, reductions in leaf biomass (14%), SLA (17%) and LAI (27%) were recorded”
Claim · model-written summary
Specific leaf area of B. decumbens was reduced by 17% in N-free stands.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- N −e1
- Outcome
- SLAe1
- Direction
- reductionse1
- Value
- 17%e1
- Comparator
- N +e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“two N supplies, with ( N +) and without ( N −)”
e1“In N − stands, reductions in leaf biomass (14%), SLA (17%) and LAI (27%) were recorded”
Claim · model-written summary
Leaf area index of B. decumbens was reduced by 27% in N-free stands.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- N −e1
- Outcome
- LAIe1
- Direction
- reductionse1
- Value
- 27%e1
- Comparator
- N +e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“two N supplies, with ( N +) and without ( N −)”
e1“In N − stands, reductions in leaf biomass (14%), SLA (17%) and LAI (27%) were recorded”
Claim · model-written summary
Forage yield of B. decumbens was similar between soil N conditions.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- soil N conditionse0
- Outcome
- forage yielde0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“forage yield was similar between soil N conditions”
Claim · model-written summary
Under shade, peaks of leaf photosynthesis A in B. decumbens were comparable to those at full light.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- shadee0
- Outcome
- peaks of Ae0
- Direction
- comparablee0
- Comparator
- full lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“Under shade, peaks of A were comparable to those at full light, so A / Q was higher around midday”
Claim · model-written summary
Under shade, leaf radiation use efficiency A/Q of B. decumbens was higher around midday.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- shadee0
- Outcome
- A / Qe0
- Direction
- highere0
- Qualifier
- around middaye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“Under shade, peaks of A were comparable to those at full light, so A / Q was higher around midday”
Claim · model-written summary
Derived parameters of the A-PPF curves of B. decumbens were similar between S0 and S2.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Treatment
- S 2e0
- Outcome
- Derived parameters of the A ‐ PPF curvese0
- Direction
- similare0
- Comparator
- S 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“Derived parameters of the A ‐ PPF curves were similar between S 0 and S 2”
Claim · model-written summary
A maximum fractional intercepted PPF of 0.8 was recorded at LAI 3-4 in the S0N+ and S1N+ stands.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Outcome
- maximum f PPFe0
- Value
- 0·8e0
- Qualifier
- LAI = 3–4e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“A maximum f PPF = 0·8 ( S 0 N +, S 1 N +) was recorded at LAI = 3–4”
Claim · model-written summary
Under limited sunlight, relatively high canopy RUE (1.6-2.8 g MJ-1) was observed over both soil N conditions in B. decumbens.
- Taxon
- Brachiaria decumbensUrochloa decumbenst0
- Outcome
- RUEe0
- Value
- 1·6–2·8 g MJ −1e0
- Qualifier
- Under limited sunlighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brachiaria decumbens”
e0“Under limited sunlight, relatively high RUE (1·6–2·8 g MJ −1”
Claim · model-written summary
The authors concluded that B. decumbens had a high plasticity to shade, explaining its success under silvopastoral systems.
- Taxon
- B . decumbensUrochloa decumbense0
- Outcome
- success under silvopastoral systemse0
- Qualifier
- high plasticity to shadee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We concluded that B . decumbens had a high plasticity to shade, thus explaining its success under silvopastoral systems”
The same questions in other papers
light · growth · Urochloa decumbensPositive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- no effect
1 paper more in this group
See all 5 papers →shade · growth · Urochloa decumbensResults agree
1 paper in the same direction as this paper
- positive
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.