Genetic Variability of Coffee (Coffea arabica L.) Germplasm in Biennial Bearing and Its Influence on Selection Efficiency

Table 7

Biennial bearing and selection of promising lines at Tepi.

Access.	Rank (2YRS)	RP1	Rank (3YRS)	PR2	Rank (4YRS)	RP3	Rank (5YRS)	RP4	I
T 21/11	15	0.23	15	11.90	15	28.83	10	47.87	0.22
T 22/11	14	79.20	8	5.88	7	39.31	7	28.88	0.38
T 36/11	13	63.32	7	10.00	8	49.45	6	44.90	0.42
T 37/11	2	45.50	4	11.11	4	46.83	1	56.23	0.40
T 38/11	5	64.63	11	22.22	10	43.63	2	66.91	0.49
T 40/11	1	73.79	3	33.33	3	40.44	4	39.33	0.47
T 41/11	7	10.74	6	26.43	6	56.40	8	28.77	0.31
T 42/11	4	56.09	2	4.76	2	35.01	5	43.28	0.35
T43/11	3	9.16	1	15.79	1	22.05	3	48.99	0.24
T51/11	12	9.78	5	36.10	5	51.68	9	4.66	0.26
≤10 HY in %	70		80		90		100

Rank (2YRS): ranks of the top 10 genotypes using the mean of over two years (2016 and 2017), 3YRS: the mean of over three years (2016–2018), 4YRS: the mean of over three years (2016–2019), 5YRS: the mean of over five years (2016–2020), RP1-5: relative percentage bienniality between consecutive years, ≤15 HY in %: the top 15 high yielder in percentage, and I: biennial bearing intensity. Note: over the top 15 high yielders selected using the average mean of yield over five harvesting seasons. The bold values or selection efficiency in the percentage show the experts’ efficiency in selecting promising line across harvesting season. Also, the values predict how much promising lines could be excluded from the selection due to their bienniality nature; additionally, the values manifest the appropriate time or harvesting season of selecting promising lines or at the time when high selection efficiency is achieved. This part is highly important to create awareness for coffee experts not to simply select advanced line during selection and bold-out the influence of bienniality to the experts. In general, all these were clearly discussed in the article text or body.