Characteristics of Nutrient Input/Output and Nutrient Balance in Different Regions of China

Clearance of nutrient input/output and balance in farmland in different regions of China is critical for nutrient management,scientific distribution and application of fertilizer resources,and improving nutrient use efficiency,etc.Based on existed literatures this paper systematically analyzed and discussed the current nutrient resources and application status,estimated the amount of manures,crop straws and their potential amount of nutrients NPK.The characteristics of nutrient input,output and balance in different regions of China were analyzed and evaluated.Strategies and suggestions on nutrient management were discussed based on the existed issues of nutrient input and output.