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Received: February 1, 2017 Revised: February 22, 2017 Accepted: February 28, 2017 In this study, we evaluated the nitrogen (N) mineralization potential and Nitrogen use efficiency (NUE) of oil-cake, compost, hairy vetch and barley, which are the most widely used organic amendments in South Korea. The N mineralization potential (No) for organic fertilizers treated soil was highest for the hairy vetch treatment with a value of 18.9 mg N 100 g -1 , followed by oil-cake, barley and compost. The amount of pure N mineralization potentials in hairy vetch, oil-cake, barley and compost treatments were 8.42, 7.62, 3.82 and 3.60 mg N 100 g -1 , respectively. The half-life (t1/2) of organic N in soil amended with oil-cake fertilizer mineralized quickly in 17 days. While, t1/2 values of organic N for the compost and barley treatments accounted to 44.4 and 44.1 days, respectively. Oil-cake was good in supplying nutrients to plants. Compost and barley inhibited plant growth in the beginning growth stage and this is attributed to N immobilization effect. The results of this study highlight that compost and barley could be used as potential slow release fertilizers in conventional agriculture.

Potential Nitrogen Mineralization and Availability in Upland Soil Amended with Various Organic Materials