Studies on indigenous and exotic weed competition in wheat
2006
Tunio, S.D. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Agronomy) | Korejo, M.N. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Agronomy) | Jarwar, A.D. (Agriculture Research Inst., Tandojam (Pakistan). Plant Physiology Section) | Waggan, M.R. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Soil Science)
The experiment was conducted to evaluate the effect of indigenous and exotic weed competition in wheat at Plant Physiology Section, Agriculture Research Institute, Tandojam during rabi 2002-2003. Seven weed competition treatments viz.; wheat + broad leaf weeds, wheat + narrow leaf weeds, wheat + sedges, wheat + perennial weeds, wheat + annual weeds (narrow and broad leaf weeds), weedy check were tested. The weeds under weedy check were predominantly present in the experimental area with intensity of 25%. Other treatments, wheat + annual weeds, wheat + narrow leaf weeds, wheat + perennial weeds, wheat + broad leaf weeds and wheat + sedges were present with intensity of 21.61%, 15.38%, 11.95%, 10.53% and 1.36%, respectively. Broad leaf weeds had more competition than narrow leaf weeds. The results showed that the highest grain yield (4043 kg ha-1) was obtained under weed free treatment, which had no competition because weeds were removed and whe at crop had ideal environment for growth and development. Whereas increase in grain yield was also associated with more number of productive tillers plant-1 under weed free conditions. It is concluded that more grain yield could be obtained under weed free conditions, or keeping weeds at lower intensity to reduce their competition with main crop.
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