In order to understand variation pattern of several mineral elements when stop using chemical fertilizers,the contents of available N,P,K,Ca,Fe,Zn,Mn in Red Fuji apple Orchard soils of high quality and yield in Changping district of Beijing were studied during different growth periods.The results showed that the contents of available N were declined,the lowest in the first ten-days in September.The contents of available P were declined,the lowest in August.The content of available K was the lowest in the mi...