Abstract
Biomass production, dry matter partitioning and nutrient accumulation of 3 Brachiaria species (B. brizantha, B. decumbens and B. dictyoneura) were investigated under 3 photon fl ux densities (100, 57 and 29%) and 2 levels of soil N availability (with and without N added). Plants were grown in a controlled greenhouse under shade cloths in pots containing a mixture (1:1) of fi soil and perlite. Measurements were carried out at the end of 2 growth periods: 34 days after planting (GP) and 41 days after cutting (RGP). Artifi cial shade reduced biomass production during both growth periods but the effect was greater during GP. Nitrogen availability played an increasing role only as the study progressed. A light intensity × N interaction was observed in B. brizantha and B. decumbens, but not in B. dictyoneura. Shading increased plant allometric ratios and leaf N concentration. At 57% sunlight, total plant biomass in B. brizantha and B. decumbens was similar to that at full light conditions, when no N was added to the soil. B. dictyoneura had the lowest potential to adjust to restricted light conditions. The implications of these results in terms of forage yield and quality, and persistence under defoliation are discussed.
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Claims 7
Claim · model-written summary
Artificial shade reduced biomass in both growth periods, especially the first.
- Taxon
- Brachiaria species
Brachiariat0 - Treatment
- Artifi cial shadee0
- Outcome
- biomass productione0
- Direction
- reducede0
- Qualifier
- effect was greater during GPe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Artifi cial shade reduced biomass production during both growth periods but the effect was greater during GP”
t0“Brachiaria species”
Claim · model-written summary
The role of nitrogen availability increased as the study progressed.
- Taxon
- Brachiaria speciesBrachiariat0
- Treatment
- Nitrogen availabilitye0
- Outcome
- rolee0
- Direction
- increasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen availability played an increasing role only as the study progressed”
t0“Brachiaria species”
Claim · model-written summary
Light intensity and nitrogen interacted in B. brizantha and B. decumbens.
- Taxon
- B. brizantha and B. decumbens
Urochloa brizantha.jpg?width=60)
Urochloa decumbense0 - Treatment
- light intensity × Ne0
- Outcome
- interactione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“A light intensity × N interaction was observed in B. brizantha and B. decumbens”
Claim · model-written summary
No light by nitrogen interaction was found in B. dictyoneura.
- Taxon
- B. dictyoneuraUrochloa dictyoneurae0
- Outcome
- interactione1
Not reportedTreatmentDirection
Verbatim
e0“but not in B. dictyoneura”
e1“A light intensity × N interaction was observed in B. brizantha and B. decumbens”
Claim · model-written summary
Shade increased plant allometric ratios and leaf nitrogen concentration.
- Taxon
- Brachiaria speciesBrachiariat0
- Treatment
- Shadinge0
- Outcome
- plant allometric ratios and leaf N concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading increased plant allometric ratios and leaf N concentration”
t0“Brachiaria species”
Claim · model-written summary
At 57% sunlight without added nitrogen, B. brizantha and B. decumbens had biomass similar to full light.
- Taxon
- B. brizantha and B. decumbensUrochloa brizanthaUrochloa decumbense0
- Treatment
- 57% sunlighte0
- Outcome
- total plant biomasse0
- Direction
- similare0
- Qualifier
- when no N was added to the soile0
- Comparator
- full light conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 57% sunlight, total plant biomass in B. brizantha and B. decumbens was similar to that at full light conditions, when no N was added to the soil”
Claim · model-written summary
B. dictyoneura had the least capacity to adjust to restricted light.
- Taxon
- B. dictyoneuraUrochloa dictyoneurae0
- Outcome
- potential to adjust to restricted light conditionse0
- Direction
- loweste0
Verbatim
e0“B. dictyoneura had the lowest potential to adjust to restricted light conditions”
The same questions in other papers
light · growth · Urochloa brizantha (palisade grass)Positive and negative results
1 in the opposite direction
- positive
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 · yield · BrachiariaResults agree
1 paper in the same direction as this paper
- negative
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.