Study on the Fruit Development of Specially Late-Maturing Longan Lidongben I.Requirement and Distribution of Mineral Nutrition

The experimental results showed that:there were two peak periods of N requirement in fruit,they were flowering and rapid growth stage ; K requirement peak period in fruit occured at rapid growth stage of false episperm; P requirement in fruit was relatively stable. Correlationship of N, P and K mineral nutrition between fruit and leaf was showed as followings: there was no significant correlation-ship of N,but significant correlationship of P and weakly negative correlationship of K. Distribution of each element in difterent issues of fruit was showed that : N content was high in fruit coat and nucleus;there was much K in mesocarp; most Ca and Mg occured in fruit coat; the distribution of P was relatively balance.