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Abstract

Allelopathy can be employed effectively for weed management in different ways; one such aspect may be its utilization for reducing the use of synthetic herbicides. Considering its importance as a natural weed control approach, a study comprising two doses of sorgaab (Sorghum bicolor L. water extract) 12 and 15 L ha-1 combined with lower doses i.e. ½ and 1/3rd (1075, 717 g a.i. ha-1) of synthetic herbicide (S. metolachlor) as pre-emergence spray against purple nutsedge was undertaken in cotton (Gossypium hirsutum L.) under irrigated conditions in central Punjab, Pakistan. Label dose of S. metolachlor (2.15 kg a.i. ha-1) and untreated treatment were maintained as control. The results of two years field trials revealed that 62-92% purple nutsedge control was achieved from sorgaab application in combination with reduced doses of herbicide. Similarly purple nutsedge dry weight was reduced by 75-88% than untreated control indicating that sorgaab with lower S. metolachlor doses was quite effective in suppressing purple nutsedge

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