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|Title||Leaching Potential of Linuron and Diuron in Selected Soils from Gaza Governorates, Palestine|
The increasing use of pesticides inGazagovernorates raises the potential risk of groundwater contamination, thus the Adsorption and leaching potential of two phenyl-ureas herbicide, diuron and linuron in selected soil samples fromGazagovernorates soil were studied. The adsorption behavior was studied using the batch equilibrium technique and UV-Spectrophotometer method was used to determine the concentration of the both herbicides. Soil samples from three locations inGazagovernorates from the top30 cmlayer were selected. Primary investigations of selected soil indicate that the clay fraction was ranged 10% - 27.5%. The content of organic matter was found less than 1%. Columns technique and bioassay method were used to determine the leaching potential of the herbicides in the selected soils. Mulukhia was used as a test plant in the bioassay method. Results of adsorption experiment showed that linuron and diuron are adsorbed in various amount inGazasoils according to variation in pH, organic matter and clay content. Fitting the adsorption data to Freundlich equation showed that the Freundlich constant “k” increases in the same order as the organic matter. The leaching results showed that linuron and diuron were retained in the soil columns and field plots at various depths of soil. Bioassay technique detected high concentration of diuron and linuron in the top soil layer (0-13 cm) of Middle Governorate and in the top soil layer (0-10 cm) of Khanyounis Governorate and North Gaza Governorate. The results were also evident by severe growth inhibition restricted in the top soil layers (0-10 cm) generally whereas showed normal growth at deeper layers in soil columns and field plots. A bioassay technique was a sensitive tool and detected diluted concentration of diuron and linuron at deeper layers.
|Publisher||الجامعة الإسلامية - غزة|
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