Effect of Mineral Nitrogen, Phosphorus, and Potassium Fertilizers on the Productivity of Faba Bean (Vicia faba L.) in Acidic Soils of Wolaita Zone, Southern Ethiopia

Table 5

Mean square values of the combined analysis of variance for the effects of year, mineral N, P, and K fertilizers application and their interactions on yield components and yield parameters of faba bean in Sodo Zuria District, southern Ethiopia.

Source of variations	Mean squares for yield components and yield variables
	Degrees of freedom	AGB (t ha^−1)	NPP	NSPP	GY (t ha^−1)	SY (t ha^−1)	HSW (g)	HI
Y	1	10.71	0.31^ns	2.67	0.28	7.55	1,517.52	0.03^ns
Y (R)	4	0.03^ns	2.44^ns	0.06^ns	0.02^ns	0.10^ns	14.57^ns	0.01^ns
N rate	2	156.51	91.06	1.67	25.33	56.20	808.83	0.01
P rate	2	135.39	166.00	2.93	24.41	44.85	414.04	0.01^ns
K rate	2	128.69	443.89	4.03	20.98	45.79	568.57	0.01
N rate × P rate	4	8.35	38.13	0.33^ns	1.23	3.33	31.74	0.01^ns
N rate × K rate	4	1.21	32.39	1.17	0.08^ns	0.82	45.83	0.01^ns
P rate × K rate	4	0.30^ns	11.57	0.45	0.04^ns	0.14^ns	5.00^ns	0.03^ns
N rate × P rate × K rate	8	1.40	24.54	0.39	0.32	0.58	24.97	0.02^ns
N rate × Y	2	0.02^ns	10.89^ns	0.57	0.06^ns	0.01^ns	3.11^ns	0.01^ns
P rate × Y	2	0.02^ns	1.44^ns	0.02^ns	0.02^ns	0.01^ns	16.09^ns	0.01^ns
K rate × Y	2	0.01^ns	2.04^ns	0.06^ns	0.05^ns	0.02^ns	24.38^ns	0.02^ns
N rate × P rate × Y	4	0.05^ns	3.18	0.64	0.01^ns	0.09^ns	11.22^ns	0.01^ns
N rate × K rate × Y	4	0.04^ns	2.26^ns	0.12^ns	0.01^ns	0.05^ns	1.83^ns	0.02^ns
P rate × K rate × Y	4	0.05^ns	2.77^ns	0.44	0.05^ns	0.06^ns	5.70^ns	0.01^ns
Error	104	0.18	1.16	0.14	0.06	0.14	9.97	0.01
CV (%)		5.56	9.72	11.13	7.09	8.90	3.16	9.01

Note: ns = not significant; ^,, and significant at  ≤ 0.05, 0.01, and 0.001, respectively; AGB, aboveground biomass; NPP, number of pods per plant; NSPP, number of seeds per pod; GY, grain yield; SY, stover yield; HSW, hundred seed weight; and HI, harvest index.