Abstract
This study aimed to determine the most suitable planting distace and dose of phospate fertilizer for the growth and yield of yam. The reasearch was conducted at Jln. Setia Budi, Simpang Selayang, Medan Tuntungan at ± 25 meters above sea level from April until August 2012. The research used the factorial completely randomized block design with two factors, namely phospate fertilizer (0g, 5,3g, 10,67g, and 16 g/plot) and planting distance (20x15 cm, 20x20 cm, and 20x25 cm). Parameters observed were plant length, number of branches, tuber weight per sample, tuber weight per plot, tuber diameter , root volume and and harvest index. The results showed that phospate fertilizer treatment did not show any significant effects for all parameters. Longer planting distance significantlly increased plant lengths only at 3 and 4 WAP, but not at other ages, and for all other parameters as well. Similirlly, there was no significant interaction effect of the two treatments for all parameters. Key words : phospate fertilizer, planting distance, yam
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