Persistência do herbicida sulfentrazone em solo cultivado com cana-de-açúcar

Abstract

RESUMOO objetivo do trabalho foi determinar o comportamento do herbicida sulfentrazone em solo francoargilo-arenoso cultivado com cana-de-açúcar. O delineamento experimental foi o de blocos ao acaso com cinco repetições e três tratamentos de sulfentrazone (0,0; 0,6 e 1,2 kg ha -1 ), aplicado como pré-emergente. Foram coletadas periodicamente amostras de solo (0-10 cm), em 23 épocas entre 0 e 704 dias após o tratamento (DAT). O comportamento do herbicida sulfentrazone foi avaliado por bioensaios usando a beterraba como planta-teste, sendo determinada que para a menor dose (0,6 kg ha -1 ), o herbicida persistiu até 601 DAT. Para a dose de 1,2 kg ha -1 , até o fim do ensaio aos 704 DAT, o herbicida ainda persistia. A persistência do herbicida sulfentrazone no solo é longa e proporcional à dose aplicada. Palavras-chave: resíduo, bioensaios, persistência, Saccharum sp ABSTRACT PERSISTENCE OF THE HERBICIDA SULFENTRAZONE IN SOIL CULTIVATED WITH SUGARCANEThe objective here was to determine the behavior of sulfentrazone in sandy clay soil cultivated with sugar cane. The experimental design was randomized blocks with five replications and three treatments of sulfentrazone (0.0, 0.6 and 1.2 kg ha -1 ), applied as pre-emergent. Samples of soil (0-10 cm), were regularly collected at 23 times between 0 and 704 days after treatment (DAT). The behavior of sulfentrazone was evaluated by bioassays using sugar beet as test plant, and analysis indicated that for the lower dose (0.6 kg ha -1 ), the herbicide persisted until 601 DAT. At the end of the test, 704 DAT, the herbicide still persisted for the dose of 1.2 kg ha -1 . The persistence of sulfentrazone in soil is long and proportional to applied dose.

Pseudomonas spp. as growth promoting agents of sunflower and jack bean in soil with sulfentrazone

“…Moreover, the permanence of the product in the soil for a long time (Blanco et al, 2010) increases the risks of leaching (Melo et al, 2010a) and contamination of groundwater (Santos et al, 2015). In this sense, the concern is to prevent or remedy the negative effects of the presence of this herbicide in the soil.…”

“…Sulfentrazone(N-{2,4-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl]phenyl}methanesulfonamide) is an herbicide that has residual soil activity (Melo et al, 2010b;Blanco et al, 2010) and is recommended for pre-emergence application in soybean, sugarcane, coffee, eucalyptus, citrus, tobacco and pineapple crops (AGROFIT, 2017). It presents the following physicochemical characteristics: high solubility in water (780 mg L -1 at pH 7.0), low vapor pressure (1 x 10 -9 mmHg at 25 ºC), low sorption (Koc = 43), dissociation constant (PKa) of 6.56 and partition coefficient (Kow pH7) of 9.79 (IUPAC, 2017), with microbial degradation in the soil as the major degradation pathway (Martinez et al, 2010).…”

Residual effect of pre-emergent herbicides on the initial development and biochemical composition of snap bean seedlings

“…This herbicide has excellent pre-emergent activity in soil to control of several dicotyledonous and some monocotyledon weeds, being widely used in the control of plants resistant to ALS inhibitors (Blanco et al, 2010). Dan et al (2010) studying the action of pre-emergent herbicides, verified that the residual activity of sulfentrazone was high, exceeding 200 days, which may cause damage to subsequent crops.…”

Vinasse Effect on Herbicides Clomazone and Tebuthiuron Availability in Different Kinds of Soils

“…Most herbicides are recommended for application in preemergence just after harvesting (Blanco et al, 2010); among the doi: 10.1590/S0100-83582015000400015 products used are clomazone and tebuthiuron, which are used to control monocotyledonous and dicotyledonous weeds.…”