Residues of organochlorine compounds and polychlorinated biphenyls (PCBs) were analyzed by capillary gas chromatography in fish species from El-Max Bay and Maryut Lake. The values of Grand Total (GT), and Extractable Organic Matter (EOM) were reported in this study. The results revealed an increase in chlorinated hydrocarbons with increase in body size and fat content. ΣDDTs and PCBs were the most predominant contaminants occurring in the muscle tissue of fish samples. Remarkable variations in the concentrations of PCBs components were noted among the species. The concentrations of Aroclors in all fish samples were higher than that of organochlorine compounds (OCs), this result indicating by reviewing to Goldberg Index (GI) a predominance of industrial activities over agricultural activities as the source of contamination of the marine environment. Elevated PCBs concentrations were observed in muscle tissue of Sphyraena Sphyraena and Sardina Pilchardus from El-Max Bay and two Tilapia sp. from Maryut Lake. Also variations were found in the relative proportions of p,p'-, and o,p-of DDT, DDD, DDE and p,p'-TDE in all fish samples. However, through HCHs group, α and δ-HCH were detected in trace amount in compare with γ-HCH. Aroclor 1248 is the dominant compared with Aroclor 1254 and Aroclor 1260. Individual PCB congeners were also determined. Congeners 101, 138 and 153 were the most dominants congener compared to the remained studied congeners.

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The current investigation was carried out during 2018 and 2019 seasons to study the effect of some fertilizer practices on yield, fruit quality and some mineral content of Khalas date palm grown in a private farm, Luxor Governorate, Egypt. Results showed that significant improved due to use slow release fertilizers as well as comparing total soluble fertilizers in terms of vegetative growth and nutritional status yield, bunch weight and fruit quality during both seasons. Using 600 g of N and 300 g of K via slow release fertilizers form had improved the growth and nutrient status of date palms as well as increase the fertilization efficiency. Also, it could be suggested that fertilizing by 60 to 75 of RDN and RDK via slow release fertilizers to improve the nutrient status of palm and gave the high bunch weight and consequently high yield/palm. Moreover, these fertilization treatments via slow release form gave high yield with good fruit quality compared with using 100% of RDN and RDK via mineral source during both studied seasons. On the light of previous results, it could be concluded that Fertilizing the palm by 60 to 75% of recommended doses of fertilization via slow release form to get high yield with good fruit quality. In addition, reduce the environmental pollution and increase the fertilization efficiency.

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