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Seasonal Changes in Nitrate Uptake Efficiency in Young Potted Citrus Trees

Author

Listed:
  • Belen Martinez-Alcantara
  • Ana Quinones
  • Eduardo Primo-Millo
  • Francisco Legaz

Abstract

Fertilizer isotope labelling (15N) of young Lane Late potted orange trees with differential N rates at three phenological periods (end of flowering, fruit set and fruit growth) was used to determine patterns of N uptake response and N efficiency (NUE) along the growing cycle. In a first experiment trees were fed with a saturating N solution in order to determine seasonal variations in N requirements. The second experiment tested four N rates which were equal to (N1), two (N2), three (N3) and four-fold (N4) the N requirements at each period. Increasing N rate diminished NUE being the decrease more acute at flowering as a consequence of the lower response in N uptake to increased N supply in this period. Theoretical NUE corresponding to a fertilizer rate that fulfills plant requirements in each period was calculated, being highest at the end of fruit set period (72%), which contrasted with the value obtained for flowering (28%), when potential nitrogen leaching reached therefore its maximum (71%).

Suggested Citation

  • Belen Martinez-Alcantara & Ana Quinones & Eduardo Primo-Millo & Francisco Legaz, 2012. "Seasonal Changes in Nitrate Uptake Efficiency in Young Potted Citrus Trees," Journal of Agricultural Science, Canadian Center of Science and Education, vol. 4(8), pages 1-11, June.
    • Handle: RePEc:ibn:jasjnl:v:4:y:2012:i:8:p:11
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    JEL classification:

    • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
    • Z0 - Other Special Topics - - General

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