Abstract
The objective of this study was to assess the possible existence of allelopathy and competition for water and nutrients of the grass Urochloa brizantha (Hochst. ex A. Rich.) Stapf cv. Marandu grown together with Schinus terebinthifolius Raddi in a greenhouse. The experimental design was completely randomized in a factorial scheme with 3 factors and the following levels: (1) one individual of the forest species with and without the presence of U. brizantha at a density of 4 individuals per pot; (2) supply of nutrients in limiting or non-limiting dose; and (3) supply of a limiting or non-limiting amount of water. We measured the height and root collar diameter of the tree seedlings, as well as the shoot and root dry weights of both species. There was competition by the grass with the tree species. The coexistence reduced the height by 30.5 cm, the root collar diameter by 1.58 mm and the shoot and root dry weights by 22.7 g and 9.5 g, respectively, of S. terebinthifolius. The greater supply of water in the pots increased the height by 18.9 cm of the S. terebinthifolius seedlings compared to the plants grown with limited water supply. Evidence was also observed of competition for nutrients, principally at the largest nutrient addition level, where the presence of the grass caused an additional decrease in the root collar diameter and shoot dry weight of the tree species, while the shoot and root dry weights of the grass increased. The results did not allow evaluating the existence of allelopathy of U. brizantha on S. terebinthifolius. terebinthifolius .
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Claims 8
Claim · model-written summary
There was competition by the grass Urochloa brizantha with Schinus terebinthifolius in the greenhouse.
- Taxon
- Schinus terebinthifoliuse0
- Interactor
- Urochloa brizantha
Urochloa brizanthae0weed - Outcome
- competition by the grasse1
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the grass Urochloa brizantha (Hochst. ex A. Rich.) Stapf cv. Marandu grown together with Schinus terebinthifolius Raddi in a greenhouse”
e1“There was competition by the grass with the tree species”
Claim · model-written summary
Coexistence with the grass reduced S. terebinthifolius height by 30.5 cm.
- Taxon
- S. terebinthifoliuse0
- Treatment
- coexistencee0
- Interactor
- U. brizanthaUrochloa brizanthae1weed
- Outcome
- heighte0
- Direction
- reducede0
- Value
- 30.5 cme0
- Comparator
- without the presence of U. brizanthae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The coexistence reduced the height by 30.5 cm, the root collar diameter by 1.58 mm and the shoot and root dry weights by 22.7 g and 9.5 g, respectively, of S. terebinthifolius”
e1“with and without the presence of U. brizantha”
Claim · model-written summary
Coexistence with the grass reduced S. terebinthifolius root collar diameter by 1.58 mm.
- Taxon
- S. terebinthifoliuse0
- Treatment
- coexistencee0
- Interactor
- U. brizanthaUrochloa brizanthae1weed
- Outcome
- root collar diametere0
- Direction
- reducede0
- Value
- 1.58 mme0
- Comparator
- without the presence of U. brizanthae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The coexistence reduced the height by 30.5 cm, the root collar diameter by 1.58 mm and the shoot and root dry weights by 22.7 g and 9.5 g, respectively, of S. terebinthifolius”
e1“with and without the presence of U. brizantha”
Claim · model-written summary
Coexistence with the grass reduced S. terebinthifolius shoot dry weight by 22.7 g.
- Taxon
- S. terebinthifoliuse0
- Organ / stage
- shoote0
- Treatment
- coexistencee0
- Interactor
- U. brizanthaUrochloa brizanthae1weed
- Outcome
- dry weightse0
- Direction
- reducede0
- Value
- 22.7 ge0
- Comparator
- without the presence of U. brizanthae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The coexistence reduced the height by 30.5 cm, the root collar diameter by 1.58 mm and the shoot and root dry weights by 22.7 g and 9.5 g, respectively, of S. terebinthifolius”
e1“with and without the presence of U. brizantha”
Claim · model-written summary
Coexistence with the grass reduced S. terebinthifolius root dry weight by 9.5 g.
- Taxon
- S. terebinthifoliuse0
- Organ / stage
- roote0
- Treatment
- coexistencee0
- Interactor
- U. brizanthaUrochloa brizanthae1weed
- Outcome
- dry weightse0
- Direction
- reducede0
- Value
- 9.5 ge0
- Comparator
- without the presence of U. brizanthae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The coexistence reduced the height by 30.5 cm, the root collar diameter by 1.58 mm and the shoot and root dry weights by 22.7 g and 9.5 g, respectively, of S. terebinthifolius”
e1“with and without the presence of U. brizantha”
Claim · model-written summary
A greater water supply increased S. terebinthifolius seedling height by 18.9 cm compared with plants grown with limited water.
Verbatim
e0“The greater supply of water in the pots increased the height by 18.9 cm of the S. terebinthifolius seedlings compared to the plants grown with limited water supply”
Claim · model-written summary
At the largest nutrient addition level, the presence of the grass caused an additional decrease in root collar diameter and shoot dry weight of S. terebinthifolius.
- Taxon
- Schinus terebinthifoliuse1
- Treatment
- presence of the grasse0
- Interactor
- Urochloa brizanthaUrochloa brizanthae1weed
- Outcome
- root collar diameter and shoot dry weighte0
- Direction
- additional decreasee0
- Qualifier
- largest nutrient addition levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“principally at the largest nutrient addition level, where the presence of the grass caused an additional decrease in the root collar diameter and shoot dry weight of the tree species, while the shoot and root dry weights of the grass increased”
e1“the grass Urochloa brizantha (Hochst. ex A. Rich.) Stapf cv. Marandu grown together with Schinus terebinthifolius Raddi in a greenhouse”
Claim · model-written summary
At the largest nutrient addition level, shoot and root dry weights of the grass Urochloa brizantha increased.
- Taxon
- Urochloa brizanthaUrochloa brizanthae1
- Treatment
- largest nutrient addition levele0
- Outcome
- shoot and root dry weights of the grasse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“principally at the largest nutrient addition level, where the presence of the grass caused an additional decrease in the root collar diameter and shoot dry weight of the tree species, while the shoot and root dry weights of the grass increased”
e1“the grass Urochloa brizantha (Hochst. ex A. Rich.) Stapf cv. Marandu grown together with Schinus terebinthifolius Raddi in a greenhouse”