Changes on Mineral Contents during Development of Dingao Chinese Bayberries

N,P,K,Ca,Mg,S,Fe,Mn,B,Zn and Cu in the roots,branches,leaves,and fruits of Dingao Chinese bayberry(Myrica rubra Sieb.et Zucc.)during its fruit developmental stages,from flower bud differentiation,young-fruit and fruit-expansion to senescence,were monitored.Substantial variations on the contents of N,K,Ca,Fe,Mn,B,Zn and Cu were found during the berry development.In general,these contents were higher in the young fruits and during their expansion period.In the young fruits,the highest contents of Ca and B were 3.91g·kg-1 and 54.4 mg·kg-1,respectively,found in the leaves;and those of N and K,26.07g·kg-1 and 14.33g·kg-1,respectively,in the berries.During the expansion period,the greatest content of Fe of380.7mg·kg-1 occurred in the roots;those of Ca and Zn were 4.72g·kg-1 and 751.1mg·kg-1,respectively,in the branches;and those of N and Mn,17.90g·kg-1 and 879.9 mg/kg,respectively,in the leaves.The differences and changes during the fruit development on P,Mg and S contents in the various organs were not significant.The information obtained could serve as a guideline for adequate fertilization for the cultivation of Dingao Chinese bayberries.