Reduced herbicide doses in combination with allelopathic plant extracts suppress weeds in wheat

Allelopathy is gaining popularity worldwide probably for decreasing the cost of production and environment friendly weed suppressing approach. repeated field studies conducted during 2011-12 and 2012-13 at agricutural research institute tarnab,peshawar,pakistan where allelopathic water extracts of oryza sativa,parthenium hysterophorus,phragmites australis and datura alba along with reduced doses of phenoxaprop-p-ethyl and bromoxinil+mcpa were tested for controlling weeds in wheat. it was observed that weed density was encouragly suppressed whereas spike length (cm),number of spikelets spike-1 and 1000 grain weight (g) of the wheat were improved when the allelopathic plant water extracts were used in combination with lower doses of herbicides. thus,allelochemicals provide weed suppressing option in wheat. however,more studies are required to fully explore the possibility of weed management and isolation of the chemicals involved in weed suppression for environment friendly weed management in wheat. such studies may decrease the cost of crop production and total use of herbicides. © 2014,pak. j. bot. all rights reserved.