Received: August 15th, 2023 ; Accepted: October 18th, 2023 ; Published: November 5th, 2023 ; Correspondence: [email protected] present study aims to investigate the impact of various nitrogen concentrations on
young Clementine Sidi Aissa citrus trees (Citrus reticulata Blanco), grafted on five citrus
rootstocks namely Moroccan Carrizo citrange, French Carrizo citrange, Troyer citrange, Citrus
macrophylla, and sour orange (Citrus aurantium L.). The experiment took place in greenhouses
at the Experimental station of El Menzeh INRA-Morocco, with the young trees grown in
containers. We applied five different nitrogen treatments (expressed as mg L-1 of N-P2O5-K2O):
(0–0–0), (0–25–50), (25–25–50), (50–25–50), and (100–25–50). The split-plot experimental
design was used with three replications.
The findings demonstrate that the nitrogen enrichment resulted in enhanced plant growth, marked
by increased plant height, rootstock and scion stem diameters, diameter and shoot length, relative
water content (RWC), as well as leaf chlorophyll and proline content. Optimal growth of the
Clementine Sidi Aissa trees was observed under the 100–25–50 (mg L-1 of N-P2O5-K2O)
treatment.
The study also found that leaf nitrogen concentration increased in line with the quantity of
nitrogen added, whereas the percentages of phosphorous and potassium in the leaves decreased.
The most significant growth increase across the majority of the studied parameters was noted in
Clementine Sidi Aissa trees grafted on Moroccan Carrizo citrange and Troyer citrange rootstocks
