Table 2. Parameter values of dose–response curves to penoxsulam for E. crus-galli high and moderate resistant populations.

Population	Regression parameters				GR50a (g a.i. ha-1)	RIb
	C	D	b	R2
18-ETF	−23.8498	98.0456	0.9278	0.9839	750.7525	2,668.87
18-DDX	−8.5765	100.5771	1.3927	0.9971	153.1344	544.38
18-WLH	12.2321	99.3802	1.1526	0.9912	56.0235	199.16
18-WMJ	19.3313	99.8202	1.4147	0.9920	24.3758	86.65
18-WJJ	−2.318	99.9599	1.0902	0.9982	15.5061	55.12
18-QZW	−1.0278	100.6300	2.1266	0.9977	11.1338	39.58
18-JPX	5.0945	100.2026	1.1199	0.9929	10.7240	38.12
18-JJCY	−3.4679	101.3554	1.6238	0.9919	9.4823	33.71
18-YTW	8.3816	99.9890	1.1374	0.9968	8.9614	31.86
18-HDD	1.8565	99.9810	1.8835	0.9988	6.9076	24.56
18-XYCZ	6.7458	100.1820	2.3899	0.9983	5.2352	18.61
18-JWZ	6.7779	100.1665	1.7734	0.9890	4.8596	17.28
18-JZWD	0.7337	100.0367	1.7694	0.9981	4.0714	14.47
18-XYXS	0.4137	100.0031	1.7502	0.9992	3.5175	12.50
18-JJXJ	4.1401	99.2003	2.358	0.9982	2.8776	10.23
18-NJ	−2.5043	100.0538	−1.0260	0.9913	0.2812	1.00

Notes.

^aGR₅₀, herbicide rate causing 50% growth reduction of plants.

^bRI (resistance index) = GR₅₀ value of R population/GR₅₀ value of S population.

Resistance classes: RI≤3, susceptible; 3<RI≤10, low resistance; 10<RI≤100, moderate resistance; RI>100, high resistance.