Production and Application of High-nitrogen Compost Extract as Liquid Fertilizer for Leafy Vegetable and Microalgae

This study aimed to produce high-nitrogen compost extract and applicate it land plants microalgae, a candidate crop for biofuel high value-added material production, as part of low-salinity production system. For this purpose, we selected komatsuna, leafy vegetable, Botryococcus braunii, microalga, the test species. Nitrogen-added compost, which was used deodorizing ammonia released from composting, had higher amount inorganic nitrogen than potassium, unlike general dairy cattle manure compost. The extraction efficiency fertilizer elements nitrogen-added did not increase by extending time (5 min) or increasing solvent ratio 4, except phosphoric acid. That acid increased with up 100. moisture content discharged screw press tended be lower that slurry. In culture could an alternative chemical fertilizers supplementing deficient extracts also although phosphorus deficiency observed in late stage.