The effect of calcareous soil (collected from Tushki) on some metabolic aspects and on the fiber yield of Flax (Linum usitatissimum) was studied under normal field conditions, either alone or in combination with water hyacinth dry manure at three concentration levels (0.25%, 0.5% and 1%) to improve the growth and the fiber yield of flax. The results obtained ,showed that ,the calcareous soil caused a decrease in photosynthetic pigments, endogenous phytohormones like IAA, 3 GA and total Zeatin.

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... reversible situation was found in ABA and IAA oxidase activity .more, there was an increase in phenol, lipid peroxidation and antioxidant enzymes (CAT,SOD,PPO and POX) activities. The rate of transport of elements(Jj) for K,showed a significant decrease. Na and Ca showed an increase compared with the corresponding control. However, Tushki soil caused a variable changes in fiber properties. The inhibitory effects of calcaerous soil on the metabolic activities and fiber yield of flax plants can be improved by addition of 1% dry manure