This study is designed to identify the possibility of bedsoil materials for effective microorganisms, and establish the most optimal environmental conditions to raise organic seedlings. Effective microorganisms were isolated by utilizing rhizosphere soil and crop roots at the plantations of red hot peppers, cucurbitaceae and crucifers of Dunnae-myeon, Gangwon Province, Eumseong-gun and Cheongju City, Chungbuk Province, and Suwon, Gyeonggi Province.
First chosen were twenty-two microorganisms which seem to be antagonistic to plant pathogens. Plus 22 microorganisms first picked, the second selection comprised five vegetable pathogenes - R. solani, B. cinerea, C. acutatum, F. oxysporum, and P. capsici, and four microorganisms of Bacillus sp. (JE21-1, JE21-2, ES3-3, ES4-2) featuring the vitality of broad, strong antifungal and the growth stimulation of tobacco by the test resulting from active antifungal through replacement culture, and growth stimulation through replacement culture with tobacco seeds. The seedlings of cabbages and lettuces raised by blending OHM-1 bed soils with secondly-selected four microorganisms were grown at 72-hole and 128-hole trays respectively, showing the treatment plots mixing OHM-1 bed soils with JE21-1 microorganisms were the most effective for the growth of cabbages and lettuces. The 72-hole tray has turned out to be most effective in tray size. As a result, Bacillus sp. JE21-1, an effective microorganism, were finally selected. By experimenting with fluorescent light and white LED to set up the light conditions, cabbages were raised on the bed soils, fluorescent light proved to be more effective than white LED ones. By experimenting with bottom watering and hand watering (spraying 250 ml, 500 ml, 1000 ml per tray) to explore spraying methods and its amount, spraying 500 ml at a time by hand watering has been shown to be the most effective for the growth of cabbages. Organic horticultural bed soils were manufactured by adding OHM-1 bed soil, and peat moss and elvan to Bacillus sp. JE21-1 microorganism finally selected. By using organic gardening bed soils, the seedlings of cabbages and red hot peppers were raised, indicating that organic Horticultural bed soils at large were effective for the growth of cabbages and red hot peppers. In conclusion, it has turned out that organic horticultural bed soils can be used as bed soils for production of organic seedlings.