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Effect of some pre- and post-emergence herbicides on weeds and yield of barley



Effect of some pre- and post-emergence herbicides on weeds and yield of barley



Research Bulletin, Faculty of Agriculture, Ain Shams University (2068): 23



Barley Giza 119 grown on clay loam during 1977-80 was given N as calcium ammonium nitrate at 33 kg N/feddan just before the 1st irrigation; the following herbicide treatments were applied: 2,4-D amine at 0.24, 0.48 or 0.72 kg; chlortoluron at 0.4, 0.8 or 1.2 kg; dinoseb-acetate at 0.5, 1.0 or 1.5 kg bromofenoxim at 0.25, 0.50 or 0.75 kg; chlorfenprop-methyl at 0.5, 1.0 or 1.5 kg; lumeton (methoprotryne + simazine + mecoprop) + simazine at 0.72 or 1.44 + 2.16 kg; bromoxynil at 0.24, 0.48 or 0.72 kg a.i./feddan. The predominant annual broadleaved weeds included Chenopodium album, Cichorium pumilum, Malva parviflora, Medicago hispida Melilotus indica, Sonchus oleraceus and Vicia calcarata. Pre- or post-em. application of dinoseb-acetate at 1.5 kg provided most effective control followed by bromoxynil at 0.72 kg and bromofenoxim at 0.75 kg a.i./feddan. Post-em. application of chlorfenprop-methyl, lumeton at 2.16 kg or chlortoluron at 1.2 kg a.i./feddan were effective against annual grasses. The highest grain yield of 1.515 t was obtained with 2,4-D amine at 0.48 kg, followed by 1.506 t/feddan with chlortoluron at 1.2 kg a.i./feddan. Grain yields were increased by c. 20% over the hand weeded treatment and by c. 70% over the unweeded treatment. The number of grains/ear was significantly increased

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