The objective of this study was to determine the effects of tuber size and forward speed on full automatic potato planter's performance. The results were related by linear regression. Uniformity of seed tuber spacing was determined by a computer programme and quantified by determining the ratio of misses, doubles and coefficient of variation of spacing. The trials were conducted on 4 different tuber sizes (35 < ts < 45 mm; 45 < ts < 55 mm, 55 < ts < 65 mm; 65 < ts < 75 mm (whole or cut) and at 3 different forward speeds of machine (3.60 km/h, 5.40 km/h and 8.64 km/h). It was found that seed tuber distribution pattern in the row was disturbed as tuber size and machine forward speed increased. Small tuber gave better in row tuber distribution patternthan big tubers. However, lower coefficient of variation of spacing and miss ratio were found with the usage of cut tubers than with whole tubers.
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