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International Journal of Agronomy
Volume 2014, Article ID 931840, 6 pages
Research Article

Control of Echinochloa sp. in the Irrigated Rice Crop

1Federal University of Pelotas, Campus Universitário, s/n, CP 354, 96010-900 Pelotas, RS, Brazil
2Federal Technological University of Paraná, Estrada para Boa Esperança, Km 04, 85660-000 Dois Vizinhos, PR, Brazil
3Federal University of Santa Maria, Avenida Roraima No. 1000, 97105-900 Santa Maria, RS, Brazil

Received 27 August 2013; Accepted 10 December 2013; Published 14 May 2014

Academic Editor: Robert J. Kremer

Copyright © 2014 Luís Eduardo Panozzo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The species of Echinochloa (barnyardgrass) stand out among major weeds infesting rice cropping and damages are variable depending on the weed population, rice cultivar, and management practices adopted by rice farmers. The objective of this work was to measure the control of barnyardgrass in rice cropping, cultivar Qualimax 1, due to the early times of flood irrigation, application times, and doses of penoxsulam. The experiment was conducted in the field, where the experimental design used a randomized block design with a split plot design with four replications. The treatments consisted of two application periods (early and late) of penoxsulam three times of irrigation start (1, 15 and 30 days after treatment application—(DAT)) and herbicide doses (0, 24, 36, 48 and 60 g ha−1). The herbicide penoxsulam revealed that combined with irrigation starting 15 days after herbicide application promoted efficient control of barnyardgrass.