~ 2530 ~  International Journal of Chemical Studies 2019; 7(1): 2530-2535                     P-ISSN: 2349–8528  E-ISSN: 2321–4902 IJCS 2019; 7(1): 2530-2535 © 2019 IJCS Received: 17-11-2018 Accepted: 20-12-2018   Vilas D Gasti Department of Horticulture and Post-Harvest Technology Palli Siksha Bhavana (Institute of Agriculture) Sriniketan, Visva- Bharati, West Bengal, India Snehasish Chakravorty Department of Horticulture and Post-Harvest Technology Palli Siksha Bhavana (Institute of Agriculture) Sriniketan, Visva- Bharati, West Bengal, India Correspondence Vilas D Gasti Department of Horticulture and Post-Harvest Technology Palli Siksha Bhavana (Institute of Agriculture) Sriniketan, Visva- Bharati, West Bengal, India Efficacy of herbicidal weed management in chilli + coriander intercropping system Vilas D Gasti and Snehasish Chakravorty Abstract A field experiment was conducted at the Vegetable Division in Kittur Rani Channamma College of Horticulture, Arabhavi, University of Horticultural Sciences, Bagalkot (Karnataka) during kharif 2014 and 2015 to identify the best possible method of weed control for maximizing the productivity of chilli+ coriander intercropping system. The weed population, dry weight of weeds, weed control efficiency and yield components of chilli and coriander were significantly affected in response to weed control treatments. Among the different chemical treatments, pre-emergent application of alachlor @ 1.5 kg ai/ha + 2 HW at 45 and 60 DAT recorded the lowest pooled dry matter of weeds (3.8 g), lowest population of monocot (3.47), dicot weeds (2.82) and thus exhibited the highest weed control efficiency (83.45%). The yield per ha of chilli (285q) and coriander (73.02q) net returns (Rs. 1,33,661) and B:C ratio (2.63) were also found to be highest and it was followed by pre emergence application of pendimethalin at 1.5 kg/ha +2 HW at 45 and 60 DAT. Keywords: Chilli + coiander intercropping, weed control treatments and B: C Ratio Introduction Weed management is an important component of crop production, which improves the production potential of the crop. Out of total annual loss of agricultural produce from various biotic factors in India, weeds account for 45 per cent (Subramaniam et al., 1999) [12] . The losses due to weeds are attributed to the competition between crops and weeds for natural resources. It has been generally accepted that intercropping may have significant effect in suppressing weeds in wide row planted crops particularly characterized with slow initial growth. Besides addition yield of intercrops, there is better utilization of resources, less incidence of pest and diseases and suppression of weeds at the critical early growth stages of crop (Singh and Abraham, 2017) [2] . Chilli is an important vegetable- cum- spice crop essentially used in every Indian cuisine, due to its pungency, taste, color and aroma. Among the Indian states, Andhra Pradesh stands first in terms of production and area coverage under chilli cultivation. It alone commands for 49 per cent of the chilli production in India, with a production of around 0.27 million tonnes of chillies. Karnataka follows Andhra Pradesh, contributing 14 per cent of the country’s production. Immediately after transplanting, chilli seedlings grow slowly whereas weeds emerge fast and grow rapidly competing with the crop for growth resources, viz. nutrients, moisture, sunlight and space during entire vegetative and early reproductive stages of chilli (Isik et al., 2009) [6] . The extent of reduction in fruit yield of chilli has been reported to be in the range of 60-70 per cent depending on the intensity and persistence of weed density in standing crop (Khan et al., 2012) [7] . Coriander (Coriandrum sativum L.), belonging to the family Apiaceae is popularly known as “Dhania’’, is one of the oldest and most widely used seed spice come leafy vegetable crop, by entire mankind of the world. Chilli + coriander inter cropping is one of the preferred inter cropping system followed in some parts of Karnataka. The present study evaluates the efficacy of different herbicides treatments on weed control and growth and yield of chilli + coriander inter cropping system. Material and Methods The study was carried out at the Vegetable Division in Kittur Rani Channamma college of Horticulture, Arabhavi, University of Horticultural Sciences, Bagalkot (Karnataka) during Kharif season of 2014 and 2015 on well drained red loamy soil to find out the effectiveness of