Abstract
Methane fermentation digestion liquid (MFDL) possesses sufficient nitrogen contents to use as fertilizer and can be produced at farm sites, however, the existence of insoluble contents and high viscosity makes the application difficult in a greenhouse. Therefore, the authors first developed a trial model of a filtering device based on a screen filter and an application device using water pressure. Next, a field trial was conducted in a summer greenhouse using a drip fertigation system. The MFDL amount that was periodically applied to plants was decided by counting the number of leaves. Urea application was prepared as a control. As a result, the physical treatability of MFDL application improved for drip fertigation without any stacking problems throughout the cropping season. There were no significant differences in leaf counts, applied amount of nitrogen or yield between MFDL and urea application. Applied MFDL was considered to be absorbed in cucumber via degradation and nitrification soon after application. In conclusion, MFDL is available as a nitrogen fertilizer if applied appropriately.
