SELECTION CHARACTERISTICS FOR PREDICTING YIELD POTENTIAL OF ROBUSTA COFFEE
Twelve introduced robusta clones were compared to a local line for yield performance at Chumphon Horticultural Research Center between 2001 and 2005. Trees were grown in full sun at 2.5 x 2.5 m2, trained as a multiple stem system, and occasionally irrigated during drought period. Two of the introduced clones, FRT09 and FRT68, had high yields giving in excess of 400 kg rai-1 (2,500 kg ha-1) green bean, which was significantly different from that of the local line at 145 kg rai-1 (approx. 900 kg ha-1). Two other clones, FRT11 and FRT03, also gave acceptable high mean yields in excess of 300 kg rai-1 (1,875 kg ha-1) green bean, but their seed sizes were too small. The characteristics most highly correlated with yield in this trial were determined by stepwise linear regression analysis. The best set of characteristics can explain 67.1% of coefficient of determination or variation in yield. These characteristics were number of fruits per primary, out-turn (or conversion rate of fresh cherry to green bean), number of main stems and number of bearing primaries per main stem, which were accountable for 43.0, 15.0, 7.4 and 1.7% of coefficient of determination respectively. These indicative characteristics can be used to assist selection of new robusta clones for high yield in forthcoming selection trials.
Panyatona, S. and Nopchinwong, P. (2008). SELECTION CHARACTERISTICS FOR PREDICTING YIELD POTENTIAL OF ROBUSTA COFFEE. Acta Hortic. 787, 141-146
Coffea canephora, yield performance, yield components