International Journal of Agronomy

Research Article

Control of Echinochloa sp. in the Irrigated Rice Crop

Table 1

Percentage control Echinochloa sp. (barnyardgrass) in irrigated rice, due to periods of flooding, application times, and doses of penoxsulam, Rio Grande, RS, Brazil.


Dose (g·ha⁻¹)	Beginning of irrigation	Application time
		Premature	Late	Premature	Late	Premature	Late	Premature	Late
		10 DAT¹		20 DAT		30 DAT		81 DAT	65 DAT

0	1 DAT	0 Aa²	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa
	15 DAT	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa
	30 DAT	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa	0 Aa

24	1 DAT	98 Aa	78 Ab	100 Aa	88 Ab	100 Aa	98 Aa	100 Aa	98 Aa
	15 DAT	75 Ba	64 Ba	81 Ba	85 Aa	91 Ba	92 Aa	98 ABa	98 Aa
	30 DAT	72 Ba	60 Bb	68 Cb	75 Ba	78 Cb	86 Ba	96 Ba	94 Bb

36	1 DAT	98 Aa	84 Ab	100 Aa	91 Ab	100 Aa	99 Aa	100 Aa	99 Aa
	15 DAT	86 Aa	68 Bb	85 Ba	90 Aa	99 Aa	98 Aa	100 Aa	99 Aa
	30 DAT	88 Aa	71 ABb	86 Ba	83 Aa	91 Ba	94 Aa	98 Aa	96 Ba

48	1 DAT	99 Aa	91 Aa	100 Aa	95 Aa	100 Aa	100 Aa	100 Aa	99 Aa
	15 DAT	88 Aa	71 Bb	93 ABa	92 Aa	99 Aa	98 Aa	100 Aa	99 Aa
	30 DAT	87 Aa	75 Bb	91 Ba	88 Aa	95 Aa	95 Aa	99 Aa	97 Aa

60	1 DAT	99 Aa	93 Aa	100 Aa	96 Aa	100 Aa	100 Aa	100 Aa	100 Aa
	15 DAT	96 Aa	80 Ab	98 Aa	96 Aa	100 Aa	99 Aa	100 Aa	100 Aa
	30 DAT	95 Aa	81 Ab	92 Aa	90 Aa	97 Aa	97 Aa	99 Aa	99 Aa

Days after treatment application.²Means followed by the same capital letters in the column in each application time compare times of early irrigation within dose and followed by the same lowercase line, compare application time within herbicide and times start of irrigation, and do not differ by Tukey’s test ().