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Plant and Soil

, Volume 75, Issue 1, pp 41–49 | Cite as

Nitrogen fertigation of Shamouti oranges

  • S. Dasberg
  • H. Bielorai
  • J. Erner
Article

Summary

The effects of different amounts of nitrogen fertilizer supplied in the irrigation water on nitrogen uptake, orange yield and quality of Shamouti oranges was studied in a field experiment in a mature orange grove. Nitrogen was supplied as ammonium nitrate in three concentrations (15, 35 and 60 ppm) resulting in resp. 100, 170 and 310 kg N/ha. Significant effects of nitrogen were found during four years of fruit yields and on the number of fruits per tree. The average fruit weight was not affected. The high nitrogen rates caused thicker peels and later development of orange colour. The leaf nitrate content was closely related to the fruit yield. Soil solution samples taken with ceramic cups gave a good indication of the soil nitrate content. It was shown that the spring flush of leaves is based mainly on tree nitrogen reserves, and not on nitrate uptake from the soil.

Key words

Citrus Fruit quality Leaf analysis Nitrate Nitrogen uptake Soil solution sampling 

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Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1983

Authors and Affiliations

  • S. Dasberg
    • 1
  • H. Bielorai
    • 1
  • J. Erner
    • 1
  1. 1.Institute of Soils and Water (S.D., H.B.) and Division of Citriculture (J.E.)Agricultural Research Organization, The Volcani CenterBet DaganIsrael

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