In order to study the effect of potash un the growth and yields of Soybean at different level of soil fertility and application of fertilizer (nitrogen, phosphate and calcium), 2³factorical experiment was carried out by pat culture with variety $quot;Chang-dan-baec-muc$quot; which is most spreaded variety in Korea. The experiment consisted of five replications in a randomized block experiment with three factors (soil, fertilization and potash). Treatment were at two levels; infertile and fertile soil, none and some of fertilization and potash. Thus, the experiment comprised eight treatment combinations which consisted of all combinations. The results of this experiment are as follows:
1. No effect of each of three factors on flowering date was found.
2. Leaf-yellowing and maturing date was quickened on the fertile soil but no effect of fertilization and potash was found.
3. More premature leaf-yellowing was found on the fertile soil.
4. Deeper leaf colour cuss showed on the fertile soil and in the case of fertilization but no effect of potash was found.
5. Increasing tendency of following character: length and width of leaf, height and dia of stem, number of branches and pods; was most remarkable on the fertile soil. Application of fertilizer showed also remarkable tendency of increasing, while increasing tendency of potash was the least.
6. Same tendency was found with following charactors; weight of total plant. stem and shell, and commercial grains, weight of 100 grain and number of commercial grains.
7. As the results of analysis of variance for weight of commerical grain it, was found the teach of the three factors increased soybean yields significantly (weight of commercial grain) but the effect of potash was less than the other two factors. No significant interaction was found among three factors.
8. Greater effect of potash on increasing soybean yields was found on the fertile soil, and in the case of fertilization.
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