~ 212 ~ International Journal of Chemical Studies 2017; 5(2): 212-214 P-ISSN: 2349–8528 E-ISSN: 2321–4902 IJCS 2017; 5(2): 212-214 © 2017 JEZS Received: 06-01-2017 Accepted: 07-02-2017 Mahendra Choudhary Department of Agronomy, Junagadh Agricultural University, Junagadh-362 001, Gujarat, India PK Chovatia Department of Agronomy, Junagadh Agricultural University, Junagadh-362 001, Gujarat, India Ramswaroop Jat Sri Karan Narendra Agriculture University, Jobner- 303329 Jaipur, Rajasthan, India Sheeshpal Choudhary Sri Karan Narendra Agriculture University, Jobner- 303329 Jaipur, Rajasthan, India Correspondence Mahendra Choudhary Department of Agronomy, Junagadh Agricultural University, Junagadh-362 001, Gujarat, India Effect of weed management on growth attributes and yield of summer groundnut ( Arachis hypogaea L.) Mahendra Choudhary, PK Chovatia, Ramswaroop Jat and Sheeshpal Choudhary Abstract An experiment was conducted to assess the effect of weed management on growth attributes and yield of summer groundnut (Arachis hypogaea L.) during summer, 2015 at the Department of Agronomy, College of Agriculture, JAU, Junagadh. The results of experiment indicated that growth parameters viz., plant height, dry matter accumulation at 60, 90 DAS and at harvest and nodules per plant (total and effective) at 60 DAS significantly higher under weed free. Significantly higher pod yield, haulm yield and biological yield under weed free. Keywords: Herbicide, groundnut, growth and yield 1. Introduction Groundnut (Arachis hypogaea L.) is an important oilseed crop of India, occupying about 24 M ha of land in about 120 countries under different agro-climatic zones between 40 0 S and 40 0 N (DGR, 2013). Indian has a diverse climate, as such groundnut is grown throughout the year in kharif, rabi, summer and spring seasons in one or other part of the country. The productivity of crops under irrigated condition is not stable due to various reasons. Among them weed infestation is considered to be one of the major problems. Yield loss due to weed infestation amounts to 80 per cent in groundnut (Murthy et al., 1994) [4] . Weeds are potential competitors with crops for nutrients, moisture, light and space. Control of weeds particularly in cropping system is vitally important not only to check the loss caused by them, but also to increase the efficiency of the applied fertilizers. Nutrient availability to crop can be increased by controlling the weeds (Devakumar and Gajendra Giri, 1999) [2] . The present investigation was therefore carried out to assess the losses caused by weeds and the extent to which these losses would be minimised by use of herbicides alone or in combination with cultural methods and their effect on crop yield. Materials and Methods The field experiment entitled “effect of weed management on growth attributes and yield of summer groundnut (Arachis hypogaea L.)” was conducted during summer 2015 at Instructional Farm, Department of Agronomy, Junagadh Agricultural University, Junagadh (Gujarat), which is situated in South Saurashtra Agro-climatic region of Gujarat state and enjoys a typically subtropical climate characterized by fairly cold and dry winter, hot and dry summer as well as warm and moderately humid monsoon. Which is situated at 221.5 0 N latitude and 70.5 0 E longitudes with an altitude of 60 m above the mean sea level. The soil was clayey in texture and slightly alkaline in reaction with pH 7.9 and EC 0.33 dS m -1 . The soil was low in available nitrogen (237.0 kg ha -1 ), medium in available phosphorus (22.5 kg ha -1 ) and high in potassium (284.0 kg ha -1 ). Total ten treatment combinations viz., weedy check (T1), hand weeding twice at 20 and 45 DAS (T2), weed free (T3), pendimethalin @ 0.9 kg ha -1 as pre-emergence(T4), oxyfluorfen @ 0.24 kg ha -1 as pre-emergence (T5), imazethapyr @ 0.07 kg ha -1 as post-emergence at 20 DAS (T6), premix sodium acifluorfen + clodinofop proprigyl @ 0.25 kg ha -1 as post-emergence at 20 DAS (T7), premix imazethapyr + imazamox @ 0.100 kg ha -1 as post-emergence at 20 DAS (T8), quizalofop-p-ethyl @ 0.04 kg ha -1 as post- emergence at 20 DAS +1 hand weeding at 45 DAS(T9) oxyfluorfen @ 0.24 kg ha -1 as pre- emergence followed by imazethapyr @ 0.07 kg ha -1 as post-emergence at 20 DAS + 1 hand weeding at 45 DAS (T10) were tested in a randomized block design (RBD) with three