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Research Article

Response of Yield and Yield Components of Tef [Eragrostis tef (Zucc.) Trotter] to Tillage, Nutrient, and Weed Management Practices in Dura Area, Northern Ethiopia

Table 4

Pooled data analysis (2008-2009) results of the separate and interaction effects of the treatments on yield and yield components of tef crop.


Treatment	TL	PH (cm)	PL (cm)	GY (t ha⁻¹)	AGB (t ha⁻¹)	HI (%)

Tillage (T)
Conventional tillage (6 times) passes =T1	4.4^c	83^b	14^b	1.2^b	4.9^c	0.24^b
Four times tillage passes = T2	5.9^a	100^a	22^a	1.7^a	6.0^a	0.28^a
Reduced tillage (single tillage pass) = T3	4.7^b	83^b	16^b	1.2^b	5.3^b	0.23^b
Fertilizer (F)
No fertilizer = F1	4.3^c	66^e	13^c	0.81^d	3.9^d	0.21^b
23 kg N ha⁻¹ = F2	6.4^b	87^d	19^b	1.1^c	6.1^c	0.18^c
23 kg N ha⁻¹ and 10 kg P ha⁻¹ = F3	6.8^a	103^a	22^a	1.7^a	7.4^a	0.23^a
23 kg N ha⁻¹ and 2.5 t ha⁻¹ manure = F4	6.7^a	97^b	21^a	1.4^b	6.6^b	0.21^b
2.5 t ha⁻¹ manure = F5	6.4^b	93^b	19^b	1.1^c	6.0^c	0.18^c
Weed control practices (W)
Hand weeding = W1	6.6^a	94^a	21^a	1.6^a	5.5^a	0.31^a
2,4D at 0.75 kg ha⁻¹ at five-leaf stage = W2	6.1^b	87^b	18^b	1.3^b	4.4^b	0.30^a
2,4D at 0.75 kg ha⁻¹ at six-leaf stage = W3	5.3^c	82^c	15^c	1.0^c	4.0^c	0.25^c
2,4D at 150 kg ha⁻¹ at five-leaf stage = W4	5.3^c	84^c	14^cd	1.1^c	3.9^cd	0.28^b
2,4D at 150 kg ha⁻¹ at six-leaf stage = W5	4.6^d	78^d	12^d	1.0^c	3.6^d	0.28^b
Interaction
T × F	*	*	**	**	**	*
T × W	*	ns	*	*	*	*
F × W	ns	*	*	**	*	ns
T × F × W	**	**	**	**	**	*

Means within columns with different letters are significantly different at .
Significant at the 0.05 probability level; significant at the 0.01 probability level; ns: nonsignificant at .
× indicates interaction; TL: tiller number per plant counted just before harvesting; PH: plant height; PL: panicle length; GY: grain yield; AGB: above ground biomass yield; HI: harvest index.