Atividade de herbicidas pré-emergentes em solos do cerrado, na presença e ausência de resíduos orgânicos
Nenhuma Miniatura disponível
Data
2017-06-29
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
The behavior of the herbicides in the environment is not determined solely by the
physicochemical characteristics of the products (pKa, Kow, vapor pressure, water solubility
and etc.). Soil attributes (CTC, organic matter, texture, mineralogy, pH, etc.), environmental
factors (temperature, rainfall, winds) and the practices adopted in the production systems
(cropping system, vegetation cover, chemical fertilization Or organic) also affect the behavior
of herbicides in the environment. The objective of this work was to evaluate: 1 - The effect of
the soil type on the activity of the herbicides clomazone, diclosulam, oxyfluorfen and
sulfentrazone and to determine the ideal dose of this herbicide in each type of soil, through
dose- answer; 2 - The activity of the herbicide Oxyfluorfen in soil with addition of biochar of
sewage sludge; 3 - The activity of pre-emergent herbicides, in the absence and presence of
Pennisetum glaucum straw. The soil type affected the the herbicides activities and, therefore,
should be considered when deciding the herbicide applied doses. In Cerrado soils CEC is the
most suitable soil attribute to predict the ideal herbicides doses of oxyfluorfen. The addition of
biochar from sewage sludge obtained by pyrolysis at 500 ° C increased the sorption of the
herbicide Oxyfluorfen to the soil, reducing its availability to the plants. The herbicide efficacy
of the herbicides atrazine, clomazone and diclosulam is negatively affected by the presence of
straw of Pennisetum glaucum. The presence of straw of Pennisetum glaucum does not affect
the effectiveness of the herbicides Oxyfluorfen and Sulfentrazone.
Descrição
Palavras-chave
Pré-emergentes , Bioensaio , Sorção , Biochar , Palhada , Pre-emergent , Bioassay , Sorption , Biochar , Straw
Citação
PACHECO, L. C. P. S. Atividade de herbicidas pré-emergentes em solos do cerrado, na presença e ausência de resíduos orgânicos. 2017. 101 f. Tese (Doutorado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2017.