In order to check the efficiency of some of pre-and post-emergence herbicides for weed control in maize. Total 14 weed control treatments carried out during two season 2017 and 2018 Preemergence as :Metribuzin, Acetochlor, Atrazine, Acetochlor, Remusulfuron, Pendimethalinand and Post-emergence as: Foramsulfuron, Nicosulfuron, Flumetsulam, Clopyralid, Diuran, Nicosulfuron and hand hoeing twice and untreated (control) .The obtained results showed that the dominant species were as the annual summer weed were Setaria verticilata (15.09%), Corchorus olitorius (14.15%), Cenchrus ciliaris(9.43 %), Echinochloa colona (8.49 %) and the perennial species were Cynodon dactylon (11.32%) and Convolvulus arevensis (9.43%). For most maize yield components, the pre-emergence herbicides were superior to post-emergence herbicides during both seasons. The higher grain yield ardab/fed treatments were produced by using pre-emergence i.e. Acetochlor (24.7 and 25.4)., Atrazine (23.7 and 24.9), Metribuzin (22.2 and 23.3) and Pendimethalin (20.3 and 22.7) Acetochlor (17.8 and 22.8) and for, post-emergence were Nicosulfuron the highest (19.6 and 20.8) and hand hoeing twice at 3 and 6 week after sowing was (21.2 and 20.4) in both season respectively. The higher efficiency in controlling weeds compared to weedy check (control) treatment or other weed control treatments. Weed control treatment pre-and post-emergence herbicides and hoeing significantly improved grain yield in both season. It could be concluded that as pre-emergence herbicides Metribuzin, Acetochlor, Arazine, Acetochlor, Remusulfuron, Pendimethalin and Nicosulfuron as post-emergence under doses and environmental conditions and also hoeing twice improved grain yield and reduced number and fresh weight of weeds.

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Egyptian Journal of Agronomy http://agro.journals.ekb.eg/ 7 E GYPT, Is considered as one of the bigger country importing for grain wheat. As, weeds cause many problems in agriculture reducing grain yield, the grass weeds are the most weed issue. Hence we tested some herbicides in wheat viz Clodinafop-Propargyl (WP 15%) at 0.050 kg a.i ha -1 , Pinoxaden (OD 10%) 0.06kg a.i. ha _1 , Pinoxaden (EC 0.06 %) 0.078kg a.i. ha _1 and newly Tralkoxydim at 0.12kg a.i. ha -1 , during two successive seasons 2020 and 2021 applied at 2-3leaf stage before tillering stage. The dominant grasses were (Wild oat) Avena fatua, (Ryegrass) lolium temulentum and (Canary grass) phalaris minor. The results showed increased grain yield by all herbicides applications over weedy check, Tralkoxydim (EC 10% a.i.) 8.53 t ha -1 and Pinoxaden (EC 6 % a.i.) 8.31t ha -1 and Pinoxaden (OD 10% a.i.) 8.14t ha -1 were superior. The maximum grain index (1000-grain weight) was in Clodinafoppropargyl WP 15% at 0.050 during both seasons (42.4g and 40.8g), respectively. Herbicides were effective for weed control parameters, weed population/m 2 , fresh weights and dry weights g/m 2 .

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