• Environmental engineer
• /
• v.24 s.256
• /
• pp.1-1
• /
• 2007

• Environmental engineer
• /
• v.25 s.259
• /
• pp.1-1
• /
• 2008

• Environmental engineer
• /
• v.22 s.230
• /
• pp.1-1
• /
• 2005

• Environmental engineer
• /
• v.24 s.246
• /
• pp.1-1
• /
• 2007

• The Korea Beekeeping Bulletin
• /
• s.211
• /
• pp.1-1
• /
• 1998

양봉인들이 이름지은 '연백초'

• Environmental engineer
• /
• v.22 s.229
• /
• pp.1-1
• /
• 2005

• Environmental engineer
• /
• v.24 s.245
• /
• pp.1-1
• /
• 2007

• Environmental engineer
• /
• v.24 s.248
• /
• pp.1-1
• /
• 2007

• Journal of Korean Society of Forest Science
• /
• v.101 no.3
• /
• pp.443-453
• /
• 2012

The objectives of this study were to find out proper potting medium and nutrient levels in the soil to promote the root nodule formation in black locust (Robinia pseudoacacia L.) seedlings. Commercial potting medium, compost, organic fertilizer, molded forest fertilizer, and compound fertilizer were used at different mixing rates to bring in various levels of mineral nutrients in the soil. Seedlings were grown in pots in a greenhouse for three months. Commercial potting medium containing peatmoss, vermiculite, and geolite was not suited for early nodule formation due to lack of nutrients, even though it produced good total dry weight. Compost was the best medium to promote both high total dry weight production and nodule formation with providing the proper levels of nitrogen and phosphorus in the soil. Molded forest fertilizer was acceptable for nodule formation. Compound fertilizer and organic fertilizer was not suited for nodule formation. The potting medium should contain optimum levels of nitrogen (0.05-0.2%) and phosphorus (100-600ppm) to promote early nodule formation in black locust seedlings.

• Journal of the Korean GEO-environmental Society
• /
• v.10 no.1
• /
• pp.43-48
• /
• 2009

This study was performed to investigate the characteristics of nutrient removal by Sequencing Batch Reactor (SBR) system, which could achieve high removal efficiencies of nitrogen and phosphorus and make it possible convenient management and operation. In this study, dissolved oxygen (DO), chemical oxygen demand (COD), nitrogen, and phosphorus in SBR system were examined by variation of anoxic-oxic phase repetition in order to optimize an operational method. The 1~4 times of anoxic-oxic phases (Run 1~4) were repeated during 1 cycle operation period. As the repetition frequency increased, it was more difficult to maintain DO condition enough for denitrification. The SBR system showed high COD removal efficiency more than 91% regardless of operational condition. About 68% of nitrogen removal rate was obtained in conditions of 2 or 3 times repetition of anoxic phases, in which NOx-N among discharged total nitrogen account for more than 99%. Approximately 40% of phosphorus was eliminated in the conditions of 1~3 times of anoxic phase repetition.