Genetic Gain Trend in Yield and Advanced Selection of Yayo Coffee (Coffea arabica L.) Land Race Collection

Table 4

Variance components and heritability of coffee yield for six harvesting seasons.

GVC	Harvesting years (set-I)							Harvesting years (set-II)
	2015	2016	2017	2018	2019	2020	Mean	2015	2016	2017	2018	2019	2020	Mean
σ^2g	57912	34153	20742	149168	104326	78494	49622	9845	9939	31963	237569	−93912	344586	49622
GCV (%)	24.78	27.09	9.17	24.07	16.82	15.87	15.70	20.68	18.33	14.84	26.05	—	29.11	14.79
σ^2e	37486	32952	82263	208595	176374	627352	31107	27669	21165	74983	201293	315450	162701	23177
σ^2p	95399	67105	103005	357764	280701	705847	80729	37514	31104	106947	438863	221538	507287	56359
PCV (%)	31.81	37.97	20.43	37.28	27.60	47.59	20.02	40.37	32.43	27.14	35.40	36.90	35.32	19.27
H^2	60.71	50.90	20.14	41.69	37.17	11.12	61.47	26.24	31.95	29.89	54.13	-42.39	67.93	58.88
Ft			Ns			Ns		Ns	Ns	Ns		Ns

GVC-genetic variance component, σ²g -genotypic variance, σ²e -environmental variance, σ²p -phenotypic variance, GCV-genotypic coefficient of variance, PCV-phenotypic coefficient of variance, H²-broad sense heritability, Ft-F-test, - highly significant, - significant, and ns-non-significant.