Changes of Potential NPK Input by Chemical Fertilizers and Livestock Manure from 1990 to 2011 in Korea

Abstract

The livestock manure is a good source of major plant nutrients such as nitrogen, phosphorus and potassiumand micronutrient that plants require. As aspect of establishment of nutrient management policy in nationscale, the use of livestock manure for agricultural purpose is a key factor for improving national nutrientbalance. In this study, we evaluated the tendency of livestock manure production and amount of chemicalfertilizer used in Korea from 1990 to 2011. The number of pig and chicken has been increased about two timesin 2011 compared with 1990 and therefore livestock manure continually increased with the lapse of year, butcattle and dairy was not changed significantly. The chemical fertilizer consumption of nitrogen, phosphorusand potassium per hectare arable land was decreased by 54.6, 66.0 and 63.2% in 2011 compared with 1990,respectively. In contrast, the potential input of nitrogen, phosphorus and potassium to arable land throughlivestock manure was increased by 220, 210 and 210% during this period, respectively. Therefore we need areasonable strategy for nutrient management such as combination of both manure and chemical fertilizers innear future.