Abstract:
The study was conducted at Adola Rede District, Guji Zone, in Southern Ethiopia. The objective of this study was to identify the best adaptable and high yielding Avocado (Persea americana) fruit tree varieties for Midland Agroecology of Guji Zone. Seedlings of grafted Avocado fruit tree varieties were laid out in randomized complete block design (RCBD) with three replications. A plot size of 10m x 6m was used for each Avocado fruit tree varieties. A plot consisted of two rows of grafted Avocado seedlings. On each row three grafted Avocado seedlings were planted and each plots had six grafted Avocado trees. Based on the objective of this study, vegetative growth parameters, yield and yield components data were collected during the study time. The results of this study revealed that, in terms of Vegetative growth parameters significant differences (at P<0.05) was observed among avocado varieties. In terms of survival rate, the highest survival rate was recorded from Bacon and the least one was Ettinger. The recorded stem thickness data showed that Fuerte variety was significantly higher (at P<0.05) than the others. The tree height data recorded revealed that the maximum and minimum tree heights were observed in Fuerte and Nabal varieties respectively. Moreover, there was a significance (P<0.05) difference in canopy spread among the avocado varieties was observed. Pinkerton had larger canopy spread (4.627m) and least canopy spread was recorded on variety Nabal (1.287m). Avocado fruit length, fruit width, and fruit weight was significantly (P<0.05) different among the varieties. The highest fruit length was recorded from Pinkerton (7.212cm) and the lowest value was found in Bacon (5.833cm). In terms fruit width, the highest was obtained from Bacon (8.333cm) and the least one was recorded from Hass variety (6.033cm). The largest Fruit weight was obtained from Fuerte (0.285kg) and lowest fruit weight was recorded from Hass (0.111kg) avocado. The finding of this study revealed that the average number of fruits per tree of the six improved avocado varieties was varied statistically. Hass avocado produced a significant maximum number of fruits per tree (382) and Pinkerton variety produced the minimum number of fruits per tree (131). In terms of yield per plot, the maximum fruit yield per plot was obtained from Fuerte (140 kg) and the lower number of yield per plot (110.367kg) was recorded from Ettinger. The recorded total fruit yield per hectare of Fuerte variety was significantly higher than the other varieties. The maximum fruit yield per hectare was obtained from Fuerte (14,372 kg/ha) and the minimum was obtained from Pinkerton (12,262kg/ha). Therefore, Fuerte, Bacon and Hass Avocado fruit tree varieties were recommended for Avocado Producers at Midland Agroecology of Guji Zone and for similar agroecologies.