الفهرس 
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Abstract
Two field experiments were conducted during 1997/98 and 1998/99 seasons in the Experimental Station of Sakha (Kafr EI-Sheikh Governorate).
The principal aim was to investigate the effect of planting date and some weed control programs and their interaction on abundance of weeds, weed control, growth characteristics, yield and yield components of sugar beet crop (Beta vulgaris L.). The investigation was extended to assess the toxic residues of sugar beet herbicides on two sensitive plants.
Each field experiment included 21 treatments representing the interaction between three planting dates (mid-Sep., mid Oct. and mid-Nov.) and seven weed control programs (Each of chloridazon, Pyradur, metamitron + one hoeing, Betanal Progress preceded or followed with one hoeing, conventional three hand-hoeings and unweeded treatments)
The most important results could be summarized as follow:
1- Planting dates of sugar beet, weed control programs and their interaction with relation to weed abundance:
A- After 10 weeks from planting
1- The major weed species with sugar beet crop in both seasons under the three planting dates were mostly broad leaved and some annual grassy as follow: wild beet (Beta vulgaris, L.), dentated dock (Rumex dentatus, L.); burclover