Assessing the Economic Impact of Inversion Tillage, Cover Crops, and Herbicide Regimes in Palmer Amaranth (Amaranthus palmeri) Infested Cotton

Table 5

Analysis of variance and variance-component estimates for the net returns from cotton production by year.

Fixed effects	2009			2010			2011
	DF	value		DF	value		DF	value
Tillage	1, 10	31.29	<0.001	1, 2	0.02	0.909	1, 4	0.25	0.646
Cover	2, 10	2.92	0.100	2, 8	1.35	0.312	2, 8	9.79	0.007
Tillage cover	2, 10	0.82	0.468	2, 8	0.92	0.435	2, 8	0.04	0.960
Herbicide	2, 24	13.14	0.0001	2, 24	2.19	0.134	2, 24	0.22	0.806
Tillage herbicide	2, 24	4.09	0.030	2, 24	3.39	0.051	2, 24	2.01	0.156
Cover herbicide	4, 24	1.95	0.134	4, 24	2.01	0.126	4, 24	1.15	0.356
Tillage cover herbicide	4, 24	2.02	0.123	4, 24	1.40	0.263	4, 24	1.67	0.190
Random effects		Estimate	Std. err.		Estimate	Std. err.		Estimate	Std. err.
Rep		24446	34715		3128	13900		0	0
Rep tillage		0	0		8129	16781		67626	55729
Rep cover (tillage)		33428	27832		13962	12594		19791	16627
Residual		79268	22883		31465	9083		37953	10956

Numerator degrees of freedom, denominator degrees of freedom.