Abstract
Application of raw dairy manure causes a serious problem of weed seed dispersal to crop lands. The objective of this study was to clear the effect of exposure to anaerobic fermantation on the survival of seeds of broadleaf dock (Rumex obtusifolius L.) contained in dairy slurry. Two fermentation temperatures (35 and 42.5℃) and 3 retention time (10, 15, and 20 days) were applied to determine the percentage of seed germination, assuming that the anaerobically stabilized waste would be applied as a manure after release of methane gas. The results were summarized as follows : 1. Anaerobic fermentation lowered the seed survival ratio of broadleaf dock. 2. Exposure to temperature of 42.5℃ decreased the seed survival ratio more than 35℃. 3. Compined fermentation with temperature of 42.5℃ and retention time 10 days completely suppressed seed viability. From these findings, it is suggested that anaerobic fermentation may have a similar effects on other seed types.
