Os herbicidas com elevado período residual, podem vir a provocar danos às espécies subsequentes, que apresentem sensibilidade a esses compostos. O objetivo foi avaliar o grau de fitotoxicidade do P. glaucum, após remediação da C. juncea. Cultivaram-se plantas de C. juncea em vasos até seu florescimento, aonde procederam-se a separação do solo rizoférico (previamente cultivado) e solo não rizosférico (não cultivado). Os tratamentos foram compostos pela combinação entre dois tipos de solo e quatro níveis de contaminação pelo sulfentrazone, disposto em esquema fatorial 2x4, após período de incubação, realizou-se a semeadura do P. glaucum. Notou-se melhor desenvolvimento e estabelecimento da planta bioindicadora em solos previamente cultivados, especialmente na dose de 200 g ha-1, enquanto para o solo não cultivado, o nível de fitotoxicidade de 100%. Após avaliação, observou-se a eficiência na remediação do composto pela C. juncea e a sensibilidade do P. glaucum.
There is currently a lack of information regarding the performance of cover crops grown in the Coastal Tablelands region in the North of the Brazilian state of Espírito Santo, where zero tillage is increasingly being adopted. The objective of this study was to evaluate the agronomic performance of six cover crops (ruzi grass, jack bean, and the millets ADR 300, ADR 500, ADRf 6010, and BRS 1501) under two irrigation regimes. A field experiment setup was based on randomized blocks with split plots and four repetitions. Shoot dry matter content, plant height, leaf area, chlorophyll fluorescence, and root growth of the cover crops were evaluated. The irrigation regime influences the agronomic performance of most of the cover crops, with the exception of jack bean and ADRf 6010 millet, which were tolerant to water deficiency, based on our evaluations of the variables shoot dry matter, plant height, and leaf area. In terms of biomass production, ADRf 6010 millet is the most suitable crop for use in conservation systems under conditions of water stress in this region.
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