STUDY ON THE DIFFERENCE OF NUTRIENTS IN STABLE ORCHARD AND UNSTABLE ORCHARD

The difference of nitrogen,phosphorus and potassium in Qu Shou-peng's stable orchard and Wang Chun-zhen's unstable orchard by red FuJi' trees were studied.The contents of N,P and K in leaves were down to low level during the annual periodic both in the two orchards.The contents of N,P and K in leaves were highest at sprouting period and lowest after harvest.The contents of P and K in leaves were higher in stable orchard than that in unstable orchard all around year.Before First Fruit rapid-swelling period,the content of N in unstable orchard was higher than thats in stable orchard,but it was contrary after First Fruit rapid-swelling period.Form new shoot growing period to Fruit maturity period,the contents of N and P in stable orchard were higher,the change was little,and the content decreased rapidly after harvest.After first Fruit rapid-swelling period the contents of N and P of unstable orchard were down to low level.The dynamic change of soil available nutrients(N and K) was the same between stable orchard and unstable orchard,and the difference between the two orchards was not obvious.The content of P in unstable orchard changed greatly between different phenophase,but it changed very little in stable orchard.