الفهرس 
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Abstract
ffoot of Rate and Date of Nitrogen Fertilization
Yield of Naval Drang Trees
This work took placo in Naval orange orchard near
Bolbis, Sharkia governorate.
The aiia of this work was to study the offoct of the Rate and Date of Nitrogen fertilization in increasing Navel orange production in this area and to reduco fruit DROPping.
The work was conducted. in o successive seasons
1973, 1974.
The experiment contained 6 treatments as follows:
1. 690 of actual nitrogen/tree in Nov., Jan., March.
2., 690 in Mar., May , July.
3. 1035 ‘ in Nov., Jan., March..
4. 1035 in Mar., May, July.
5. 1035 ‘ in Nov., Dcc., Jan.,
Feb., Mar., April.
6. Untreated (Control).
The study dealt with the following major approaches:
1. Effect of nitrogen fertilization on yield. and fruit quality.
2. “ on fruit setting.