This study was undertaken to clarify the effects of the amount of applied organic fertilizer 'Soilgen' and plant density on the dry matter production and the quality of cut flowers of semi-forcedlilies.
1. The solar radiation in the plant community increased and soil temperature was elevated with decreasing plant density. No significant difference was found in the mean date of flowering between sections. However, the quality of cut flowers was lowered with increasing plant density.
2. The effect of plant density on the weight of dry matter was not clearly recognized from the initial to the middle growth stage. However, the lower the plant density, the larger was the weight of dry matter after appearance of flower bud till flowering. It was not almost influenced by the amount of applied organic fertilizer.
3. As the amount of applied orgainc fertilizer increased, the dry weight of bulb at flowering tended to be large.
These results show that the influence of plant density on semi-forced-lilies of bulbous plants cropping system in the greenhouse was larger than that of the amount of applied organic fertilizer, and organic fertilizer are effective for the bulb production of next generation.