الفهرس 
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Abstract
This work was carried out t o study the effect of soil addition of different rates of gypsum (lo 2 , 3 tons/feddan) or sulfur (45, 60 or 75 kgs., feddan) t slaghtlg alkalirae cltms pltantatfons, Yowg Valencia and old Succsri orange trses, planted at ChZno, Kafr El-Shsikh, were used in thds work, during the 1975 wd 1976 seasons.