The effect of different fertilizer treatments on nutrition was studied in a long-term fixed position fertilization experiment last for twenty years.The results showed that: the content of alkaline-hydrolysable N increased by the application of N fertilizer,the content of total P and available P increased by the application of P fertilizer,and the content of available K increased by the application of K fertilizer.After 20 years,comparing with that of pre-experiment,the alkaline-hydrolysable N increased 2.61...