Studies on the Techniques for Once-over Harvesting of Processing Tomato
1. Screening of processing Tomato Cultivars
S. L. Hwang
Experiments were conducted in the field to evaluate quality of the 13 processing tomato cultivars newly introduced from the U.S.A. and the 2 local cultivars for once-over harvesting purposes. Five cultivars i.e. UC-82B, UC-82, VF-6203-1, VF-9209, and Peto-98 outyielded 63 m.t./ha of fresh fruits. Due to their high yielding potential, high once-over harvesting percentage (92.7% and 96.7%, respectively), bush type plant, early maturity and concentrated fruit setting, cultivars UC-82 and Peto-82 and Peto-98 were suitable for once-over harvesting. Cultivars UC-82B, VF-6203-1 and VF-9209 also were with had high once-over harvesting percentage (87.7%, 98.5% and 97.5%, respectively), but they were not as good as UC-82 and Peto-98 in early maturing, concentrated fruit setting and other horticultural characteristics. Advanced observations and evaluations of the promising lines are needed in the future. Rest of the introduced cultivars such as Heinz-2653 was with good firm fruit and high percentage of once-over harvesting, but they produced fewer yields with open plant type. Therefore, they were not suitable for once-over harvesting in Taiwan. The once-over harvesting percentages and yield of the 2 local cultivars TK-70 and TNS-2 were only 40.6%, and 28.4 m.t./ha, 61.7%, and 41.5 m.t./ha, respectively. They were also not suitable for once-over harvesting.