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Dinâmica da vegetação em pastagem nativa, submetida a diferentes métodos de controle de espécies indesejáveis e adubação Vegetation dynamics in native pasture submitted to control methods for weeds species and fertilization
| Content Provider | Semantic Scholar |
|---|---|
| Author | Pellegrini, Luiz Giovani De Nabinger, Carlos Neumann, Mikael Ost, Paulo Roberto |
| Copyright Year | 2007 |
| Abstract | Em area de pastagem nativa representativa da transicao entre a Serra do Sudeste e a Depressao Central do Rio Grande do Sul, foram testados os efeitos associativos de quatro metodos de controle de plantas indesejaveis 1 - sem controle (SC); 2 - controle mecânico - rocada de primavera (CMP); 3 - controle mecânico - rocada de outono (CMO) e 4 - controle quimico - herbicida comercial a base de Picloram (64 g.l -1 ) + 2,4-D (240 g.l -1 ), na dosagem de 5 l p.c.ha -1 (CQT)), dois sistemas de fertilizacao (1 - sem-adubo e 2 - com adubo), duas datas de avaliacao (1 - primeira data - 16/05/2003 e 2 - segunda data - 26/03/2004 ) e dois toques na pastagem (1 - estrato superior e 2 - estrato inferior) sobre a composicao floristica e frequencia de especies. As leguminosas nativas ocupam, com maior frequencia, o estrato inferior da pastagem (5,9%), as indesejaveis, ao contrario das leguminosas, ocupam o estrato superior (5%). O controle quimico proporcionou aumento na frequencia de gramineas a medida que diminuiu a participacao de leguminosas. A graminea com maior participacao na composicao da pastagem foi o Paspalum notatum com diminuicao especialmente de Desmodium incanum dentre as leguminosas no CQT. A ad뫊o favoreceu a participacao da leguminosa Trifolium polymorphum (2,0% vs 1,1%, com ad뫊o e sem-ad뫊o, respectivamente). O controle mecânico proporcionou aumento na frequencia de Vernonia nudiflora no estrato inferior (5,7%) da pastagem comparando-se ao SC (3,6%). O controle mecânico de outono, com apenas uma rocada durante o periodo experimental, foi mais eficiente que o mecânico de primavera. Abstract In a representative natural pasture area in the transition between the Serra do Sudeste and Depressao Central in Rio Grande do Sul, the associated effects of four methods for controlling undesirable species were tested (1 = without control (SC), 2 = mechanical control – spring mowing (CMP), 3 = mechanical control – autumn mowing (CMO) and 4 = chemical control – commercial herbicide Tordon, composed by Picloram (64 g.l -1 ) + 2,4-D (240 g.l -1 ), in the dosage of 5 l p.c.ha -1 (CQT)), associated to two systems of fertilization ( 1 = without fertilizer and 2 = with fertilizer). Two evaluation times (05/16/03 and 03/26/04) and two touch in pasture (1 = first touch and 2 = second touch) were considered on aspects related to the floristic survey and species frequency. The native leguminous plants generally appear in the lower stratus of the pasture (5.9 %), the undesirable ones appear in the upper stratus (5.0%). The chemical control promoted an increase in the grass frequency, as well as decreased the leguminous presence. The Paspalum notatum is the most frequent grass, and Desmodium incanum , mainly, decreased (among the legumes) in CQT. The fertilization favored the Trifolium polymorphum participation (2.0% vs 1.1% with and without fertilization, respectively). The mechanical control increased the frequency of Vernonia nudiflora in lower pasture stratus (5.7%) comparing to SC (3.6%). The autumn mechanical control with only one application during the experience time was more effi cient than the spring mechanical control. |
| Starting Page | 297 |
| Ending Page | 309 |
| Page Count | 13 |
| File Format | PDF HTM / HTML |
| Volume Number | 3 |
| Alternate Webpage(s) | https://revistas.unicentro.br/index.php/ambiencia/article/download/369/pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
