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The aim of this study was to investigate the biomass formation and nitrogen (N) uptake trends during vegetative period in Clementine mandarin ( Citrus reticulata  Blanco). In this study, the organs (branch, leaf, flower, bud and fruit) of shoots &lt;12 and &gt;12 month-old were analyzed for biomass formation and distribution, N concentration and uptake amounts for 2 years. Results showed that biomass accumulation was 9.7 kg/tree at the beginning of production season, 62.8 kg/tree before harvest and 46.9 kg/tree at the end of production season. Nitrogen concentration showed a decreasing trend in leaves and fruits of shoots &lt;12 month-old while a decreasing trend was observed in fruits and an increasing tendency for leaves in shoots &gt;12 month-old. It is concluded that 1377 g N/tree accumulated in the shoots (&lt;12 and &gt;12 month) of the Clementine mandarin trees through one production season (262 days). This amount was provided by both soil and fertilizer N in addition to remobilization. In consideration of total N and organic matter values of the soils in the research groves and the amounts of N-containing fertilizer that were applied, it may be seen that remobilization may have a significant part of the supply of N for different organs in total throughout the production season or based on different periods. These results show that improvement in biomass and N allocation can be achieved in Clementine mandarins through proper tracking of N uptake during different growth stages and in different plant organs.

Clementine mandarin: biomass formation, distribution and nitrogen uptake trends