In order to determine the difference of seedling vigor in heterotrophic phase of seed by different size of radish seeds, that is, large, medium and small, growth rate and emergence percent were measured using the rolled filter paper method and sand method, respectively. The results obtained were summarized as follows:
1) Emergence percent obtained from germination test using sand method was higher in larger seeds, though there was no statistical significance among three classes of seed size.
2) The elongation of hypocotyl and root, in seven days after seeding, was not markedly effected by different size of seeds, but the larger seeds promoted the elongation of cotyledon in comparison with the smaller seed.
3) Each fresh weight of cotyledon, hypocotyl and root and their total fresh weight, and each dry weight of hypocotyl and root increased in the larger seeds and when the days after seeding were passed away. And dry weight of cotyledon was also higher in the larger seeds but it was decreased gradually when the days after seeding were passed away.
4) From the above results, it is concluded that the larger seeds make the higher emergence percent and growth rate in heterotrophic phase of seeds.
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