The studied area during the period of investigation (2005) for El-Arish
characterized by moderate temperature during the growth period, which were favorable
for plant growth. Mean while the total annual amount of rainfall was 21.8 mm during
the period of investigation. The soil supporting Isatis microcarpa indicated that the soil
was alkaline in reaction with pH 8.20 at surface layer (0-20 cm) and 8.42 at bottom
layer and sandy in texture at Wadi Om Sheihan, North Sinai.