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EFFECT OF SOME AMINO ACIDS ON THE PHYSIOLOGICAL CHARACTERISTICS OF
MAIZE PLANT UNDER SOIL SALT STRESS CONDITIONS IN EGYPT AND TUNISIA
EC of the soil (1: 2.5) extract was 2.65 dS.m-1 (as a mean values).
This means that the accumulation of salts is attributed to using salt

water for irrigation. The amount of total soluble salts in all layers of
the investigated soil profiles, are classified as saline soil. Mean values

of soil pH range from 8.24 to 9.92. Mean values of cations (Ca++,
Mg++, Na+ and K+) were (4.28, 2.65, 18.21 and 1.33 meq.l-1) re-

spectively, while anions (HCO3-, Cl- and SO4=) were (5.89, 17.53
and 3.05 meq.l-1), respectively, (Table.1). Also, available macro-nu-

trients nitrogen, phosphorous and potassium (N,P and K) content are
generally very low and irregular with soil depths . Available contents

of nitrogen, phosphorus and potassium (N, P and K) are (4.24, 2.59
and 72.70 mg/Kg), respectively. Consequently, the concentrations of

these elements in the different soil are low, as depicted in Table. 1.

3.2. Water quality for irrigation assessment

3.2.1. Hydrogen ions activity (pH value).

Data presented in Table (2) exhibited that the pH value is (7.88).
It means that the pH of irrigation water is within the permissible lim-
its for irrigation according to Ayers and Westcot (1985).

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