IRRIGATION WITH DIFFERENT SEWAGE WATER AND ITS EFFECT ON PRODUCTIVITY AND QUALITY OF EGYPTIAN MANDARIN ( CITRUS RETICULATA) UNDER NEWLY RECLAIMED AREAS

Abstract

Field experiments were carried out one the representative areas at E I-Salhiya which inigated with Nile water (control), EI­ Gabal EI-Asfar area, irrigated with sewage water of Cairo city and Balu EI-Bakar area, irTigated with combined drainage water, planted with unique species varieties (Egyptian mandarin) in three seasons during 1995-1997.ln an attempt to study the effect of irrigations with different water resources on growth and productivity of Egyptian mandarin trees.

The effects of prolonged irrigation by waste water (sewage and combined drainage waters) on heavy metal s accumulation in soil and plant (Egyptian mandarin) were studied in Egypt. The results indicated that the concentration of Fe, Mn, Zn, Cu, Cd, Ni, Co and Pb in irrigation water samples were below than the maximum. permissible limits.

The highest values of Pb, Co, Ni, Cd, Zn, Mn, Cu and Fe were produced in leaves, shoots, fruits and peel oftrees inigated with sewage and combined drainage waters. However the levels of heavy metals in tested parts of Egyptian m andarin arc considered to be within the pennissible limits and rather below their side toxic effects on plant.

The concentration of total amino acids in leaves and fruits of mandarin trees itTi gated with the waste water was significantl y higher than those inigated with Nile water.

Peroxidase activity increased in leaves and fruits produce of trees irTi gated with combined drainage and sewage waters as compared to value the amount of peroxidase activity in those iniga ted with Nile water.

The protein patterns (SDS) of Egyptian mandarin leaves and fmits changes according to inigation water resources, since water pollution alternate the number and the area of protein fraction.