C. A. AGASIMANISOMASHEKHAR S. MUTNAL2019-06-202019-06-202007-10-01TH8716http://krishikosh.egranth.ac.in/handle/1/5810109292A field experiment was conducted at Main Agricultural Research Station, University of Agricultural Sciences, Dharwad during khartf and rabi seasons of 2005-06 to study the efficiency of herbicides in groundnut- wheat cropping system. There were 7 treatment combinations in each crop and experiment was laid out in randomized complete block design with three replications. ^ In kharif groundnut weed control treatments differed significantly. The treatment butachlor @ 1.5 kg/ha PE + 2 IC at 30 and 40 DAS + 1 HW at 45 DAS ill /c/iari/'groundniil and in robi wheat triasulfuron @ 15 g/ha at 20 DAS recorded significantly lower weed population and weed dry weight next only to weed free check. In groundnut application of butachlor @ 1.5 kg /ha PE + 2 IC at 30 and 40 DAS + 1 HW at 45 DAS resulted in highest pod yield (2353 kg /ha) and was on par with pretilachlor @ 1.5 kg /ha PE + 2 IC at 30 sind 40 DAS + 1 HW at 45 DAS. alachlor @ 1.5 kg /ha PE + 2 IC at 30 and 40 DAS + 1 HW at 45 DAS and weed free check. The higher pod yield over weed free check is due to suppressing weed seed gemiination and seedling development at early stages due to the effect of pre-emergent herbicides. In wheat application of triasulfuron @ 15 g /ha at 20 DAS resulted higher grain yield (3028 kg /ha) but was on par with weed free check (3182 kg /ha). In groundnut maximum net income of Rs.20150 /ha and benefit cost ratio of 1:1.20 was obtained with butachlor, whereas, in case of wheat Triasulfuron recorded maximum net return Rs. 15996/ha and benefit cost ratioennullThesis