Estimating the impact on maize production by the weed Parthenium hysterophorus in Pakistan

Table 2 ANOVA table showing results of linear and quadratic regression models for measuring the effect of Parthenium hysterophorus density on maize (Zea mays ‘CORTEVA 30K08’) yield loss (%), yield (Kg of grains per ha), number of cobs per plot, number of cobs per plant, number of grains per cob, and weight of 1000 grains per treatment

Response variable	Figure	Variable	Estimate	SE	t-value	Pr( >\|t\|)
Yield	Figure 1A	Intercept	3936.78	156.66	25.13	< 0.001	***
		Weed_density	− 261.16	62.16	− 4.2	0.025	*
		Weed_density^2	9.96	3.72	2.68	0.075
Cobs per plot	Figure 1B	Intercept	14.89	0.14	108.77	< 0.001	***
Cobs per plot	Figure 1B	Weed_density	− 0.17	0.02	− 9.12	0.001	***
Cobs per plant	Figure 1C	Intercept	1.06	0.02	48.7	< 0.001	***
		Weed_density	− 0.03	0.01	− 3.3	0.046	*
		Weed_density^2	0	0	1.94	0.147
Grains in row	Figure 1D	Intercept	14.89	0.14	108.77	< 0.001	***
Grains in row	Figure 1D	Weed_density	− 0.17	0.02	− 9.12	0.001	***
Grains per cob	Figure 1E	Intercept	564.77	9.09	62.1	< 0.001	***
Grains per cob	Figure 1E	Weed_density	− 7.09	1.21	− 5.88	0.004	**
Grain weight	Figure 1F	Intercept	269.1	2.47	109.11	< 0.001	***
		Weed_density	− 5.48	0.98	− 5.6	0.011	*
		Weed_density^2	0.23	0.06	4	0.028	*
Yield loss	Figure 2	Intercept	5.65	3.62	1.56	0.216
		Weed_density	6.52	1.44	4.54	0.020	*
		Weed_density^2	− 0.25	0.09	− 2.94	0.061

ISSN: 2662-4044