injúria potencial de herbicidas de solo ao girassol: i - clomazone potential sunflower injury by soil applied herbicides: i - clomazone
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ID: 156996
1993
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Abstract
Conduziu-se um ensaio de campo na Estação Experimental Agronômica da Universidade Federal do Rio Grande do Sul, em Eldorado do Sul, RS, em 1989/90. O objetivo deste trabalho foi determinar o efeito residual potencial do herbicida clomazone, aplicado em três doses à superfície do solo (PRE) ou incorporado no mesmo (PPI), sobre a cultura de girassol. Através de ensaio complementar, realizado em casa-de-vegetação em 1990, procurou-se determinar o local de absorção de clomazone por plântulas de girassol. A localização de clomazone no solo foi muito importante na determinação de sua injúria para o girassol. A campo, clomazone promoveu injúria mais acentuada nas plântulas, quando aplicado em PRE do que em PPI. Clomazone, aparentemente, foi mais absorvido pelo hipocótilo do que pelo sistema radicular das plantulas de girassol. No entanto, nas maiores doses, a fitotoxicidade em PPI se acentuou com o decorrer do tempo, a ponto de desaparecerem as diferenças entre épocas de aplicação.
A field experiment was carried out during 1989/90 at the Eldorado do Sul Experimental Station of Federal University of Rio Grande do Sul, Brazil, with the objective of evaluating potential injury to sunflower by clomazone applied at three different dosages in pre-emergence (PRE) or preplant incorporated (PPI). A greenhouse trial was carried out in 1990 to determine the site of uptake for clomazone from the soil. Clomazone placement in the soil was very important in determining the level of injury to the plants. The leved of injury to seedlings was higher when clomazone was sprayed in PRE as compared to PPI. Apparently, more clomazone was absorbed through the sunflower hypocotyl than by the root system. Late season assessments indicated that higher dosages were equally phytotoxic under both application methods.
A field experiment was carried out during 1989/90 at the Eldorado do Sul Experimental Station of Federal University of Rio Grande do Sul, Brazil, with the objective of evaluating potential injury to sunflower by clomazone applied at three different dosages in pre-emergence (PRE) or preplant incorporated (PPI). A greenhouse trial was carried out in 1990 to determine the site of uptake for clomazone from the soil. Clomazone placement in the soil was very important in determining the level of injury to the plants. The leved of injury to seedlings was higher when clomazone was sprayed in PRE as compared to PPI. Apparently, more clomazone was absorbed through the sunflower hypocotyl than by the root system. Late season assessments indicated that higher dosages were equally phytotoxic under both application methods.
| Reference Key |
vidal1993plantainjria
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|---|---|
| Authors | ;Ribas A. Vidal;Nilson G. Flecks |
| Journal | anti-cancer agents in medicinal chemistry |
| Year | 1993 |
| DOI |
10.1590/S0100-83581993000100006
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