椪柑果实在生长发育期中的养分积累规律

对Bing柑果实生长发育期间的养分积累规律进行了研究，结果表明：8月份以后，Bing柑果实中干物质净积累量占全生育期总累积量的86．93％；N、P、K、Ca、Mg、Cu、Zn、Fe、B等营养元素随Bing柑果实的生长发育而不断积累，在幼果期各种营养元素的净累积量和积累强度小，果实迅速膨大期以后各种营养元素的净累积量和积累强度增大。N、P、K元素在果实迅速膨大期以后的积累率分别为81．52％，80．0％和76．34％；Ca、Mg元素主要是在果实迅速膨大期以前积累较多，大部分Cu、Zn、Fe元素主要是在果实缓慢生长期和迅速膨大期积累，B元素在着色成熟期的累积率为75％。8月上旬以后，Bing柑果实中各种营养元素多次出现负积累。本文还对导致营养元素负积累的原因进行了分析讨论。

Regularity of Nutrient Element Accumulation in Pankan Fruit During Growth and Development

The regularity of dry matter and nutrient element accumulation in Pankan fruit have been studied. The results showed that percentage of net accumulation of dry matter account for 86.93% of Pankan fruit total accumulation amount after August. The accumulation of N, P, K, Ca, Mg, Cu, Zn, Fe, B in the fruit showed a tendency of increase from fruit setting to harvesting. Net accumulation amount and accumulative intensity of nutrient elements were small in young fruit, and increased after period of the fruit speedy growth. Percentage of accumulative amount of N, P, K in the stage after period of the fruit speedy growth in total accumulation of whole growth and development period in Pankan fruit were 81.52%, 80.0% and 76.34%. It was before the fruit speedy growth period that Ca and Mg accumulated largely. The majority of Cu, Zn, Fe accumulated from slow growth period to speedy growth period of the fruit. Percentage of accumulative amount of B during mature period in total accumulation of whole growth and development period in Pankan fruit was 75.0%. After first ten days of August, the nutrient elements above all presented negative accumulation frequently. Some problems about nutrient elements negative accumulation frequently were discussed.