الفهرس 
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Abstract
The present investigation was carried out in the farm of the Department of Horticulture, Faculty of Agriculture, Kafr El-Sheikh, Tanta University during 1978 and 1379 seesons. Ths aim of the present work was to study the effect of different levels of irrigation on growth characters, osmotic pressure, water fractions and traspiration rate, of young ’jilashil?gcn Navel orange trees. Also the work included the study of the effect of N, NP, md NPK fertilLzers on such characters and indices.