الفهرس 
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Abstract
This study was planted to evaluate :
1-the efficiency of certain herbicides on weed vegetation in potato and cotton in Minia region .
2-the effect of these herbicides on some growth traits and yield characters of potato and cotton .
3-the time behaviour of the residues of some soil –applied herbicides in potato and cotton .
1-potato Experiment
2-cotton experiments
3-herbicide residues