Effect of source and rate of nitrogen fertilization on yield, fruit quality and leaf mineral composition of Valencia orange trees grown in Riyadh, Saudi Arabia

Sabbah, S.M.; Bacha, M.A.; El Hamady, M.A.

Journal of King Saud University, Agricultural Sciences 9: 141-152

1997


Accession: 003113002

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Abstract
The effects of ammonium sulfate or urea at different rates (0, 250, 500, 750 or 1000 g N/tree) on yield, fruit quality and leaf mineral composition of Valencia oranges growing in Riyadh, Saudi Arabia, during 1992-93, were investigated. No significant differences in yield, physical or chemical properties of fruits were observed due to N source. N rate affected yield and most of the investigated fruit properties in both seasons. Yield and fruit properties responded positively to increasing rates of N compared with the control and the lowest rate of N. N fertilization was more effective in the second season. In leaves, the application of ammonium sulfate significantly increase in leaf N content compared with applying urea. Furthermore, increasing N rates resulted in a significant increase in leaf N content compared with the control. No obvious effect was found on leaf macro or micronutrient contents due to N source. Increasing rates of N increased leaf Mg and Cu contents, slightly increased leaf Fe and Mn contents, and decreased leaf K and Na contents compared with the control. Leaf P, Ca and Zn contents were unaffected by the different rates of N.