Author(s):

KC Sharma, PS Parmar, KS Solanki and Upendra Singh

Abstract: The field experiments were conducted at Research Farm of ICAR-IARI, Regional Station, Indore, Madhya Pradesh for two consecutive years during rabi season of 2011-12 and 2012-13 to find out the efficacy of different post emergence herbicides to control the complex weed flora in wheat (Triticum aestivum). Data collected on weed dynamics indicated that weeds density (both broad and narrow leaved weeds) observed at 60 and 120 days after sowing (DAS) decreased significantly in both the years as compared to weedy check. Post emergence application of ready mix Clodinafop + Metsulfuron (30 days after spray) at 60 DAS and Clodinafop + Metribuzin at 120 DAS recorded maximum values of weed control efficiency (WCE) to the tune of 87.4 and 89.4 per cent, respectively. It was also noted that herbicides ready mix Clodinafop + Metsulfuron recorded negative value -7.7% of weed index (WI) in first year and lowest value i.e. 0.5% during second year, where negative value indicates higher grain yield as compared to weed free treatment. Grain (6.46 and 4.16 t ha^-1) and biological yields (15.77 and 8.89 t ha^-1) recorded with Clodinafop + Metsulfuron in both the years were significantly at par with weed free and under application of Sulfosulfuron and Mesosulfuron + Iodosulfuron. Application of ready mix herbicide Clodinafop + Metsulfuron recorded higher values of energy ratio (9.61and 5.70) and energy productivity (293.8 and 197.0 g MJ^-1) in both the years over others including weed free treatment. Thus, it can be concluded that for getting efficient control of multiple weed flora and higher economical and energy efficient wheat yield, Clodinafop + Metsulfuron @ 60 + 4 gha^-1 should be applied in wheat at four week crop stage in vertisols of Central India.

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