This experiment was conducted to determine the effects of applying level of pig slurry on the characteristics of runoff and leaching water in lysimeter. Treatments were broken down into five treatments such as non-chemical fertilizer, chemical fertilizer (200㎏ N/㏊) and pig slurry (200, 400, 600㎏ N/㏊), and 3-time-repeated randomized complete block design was fulfilled. The concentrations of NO₃-N was raised(p＜0.05) in proportion to the applying level of pig slurry. NO₃-N concentration of leaching water collected from soil depth 20㎝ and 40㎝ was intensified as the applying level of pig slurry was higher (p＜0.05) in pig slurry 600㎏ N/㏊ application. In conclusion, pig slurry at the volcanic ash soil in Jeju area can replace the chemical fertilizer as it is tested that applying 200㎏ N/㏊ of pig slurry and chemical fertilizer show the same productivity of sorghum×sudangrass hybrid. But more than 200㎏ N/㏊ of pig slurry may not be appropriate because it may contaminate the runoff and leaching water even though it may increase for the forage productivity.

• Nam Geon Park
• Kyung Jun Hwang
• Hyung Soo Park
• Sang Teak Song
• Moon Chul Kim