~ 1279 ~ International Journal of Chemical Studies 2020; 8(5): 1279-1282 P-ISSN: 2349–8528 E-ISSN: 2321–4902 www.chemijournal.com IJCS 2020; 8(5): 1279-1282 © 2020 IJCS Received: 28-06-2020 Accepted: 12-08-2020 Vipul Y Patel Department of Agronomy, BACA, AAU, Anand, Gujarat, India BD Patel Agronomist & PI, AICRP Weed Management, BACA, AAU, Anand, Gujarat, India VJ Patel Associate Professor, Sheth M. C. Polytechnic in Agriculture, AAU, Anand, Gujarat, India DD Chaudhari Jr. Agronomist, AICRP Weed Management, BACA, AAU, Anand, Gujarat, India NJ Chaudhari Assistant Professor (Agronomy), Department of Ag. Meteorology, AAU, Anand, Gujarat, India Corresponding Author: Vipul Y Patel Department of Agronomy, BACA, AAU, Anand, Gujarat, India Effect of herbicide combinations on growth, yield and nutrient uptake by weeds in irrigated wheat Vipul Y Patel, BD Patel, VJ Patel, DD Chaudhari and NJ Chaudhari DOI: https://doi.org/10.22271/chemi.2020.v8.i5r.10478 Abstract An experiment was carried out for two consecutive rabi season of the year 2017-18 and 2018-19 to investigate the “Effect of herbicide combinations on growth, yield and nutrient uptake by weeds in irrigated wheat. Results showed that post emergence application of pre-mix herbicides sulfosulfuron + metsulfuron 30 + 2 g/ha, clodinafop + metsulfuron 60 + 4 g/ha and mesosulfuron + iodosulfuron 12 + 2.4 g/ha recorded significantly lower density and dry biomass of weeds, improve the promising yield attributing viz., number of effective tillers/m 2 , number of total tillers/m 2 , tiller conversion index and grain yield as well as straw yield with minimum nutrient uptake by weeds than other treatments. Sequential application of pendimethalin (PE) 500 g/ha fb sulfosulfuron (PoE) 18 g/ha, twice hand weeding at 20 and 40 DAS and tank mix formulation of sulfosulfuron + 2,4-D (SS) (PoE) 25 + 250 g/ha was stood second best treatment during both the years. Keywords: Premix, tank mix, monocot, dicot, tiller, TCI, uptake Introduction In India wheat is second most important staple food crop after rice. The major wheat growing states in India are Uttar Pradesh, Punjab, Madhya Pradesh, Haryana, Rajasthan, Bihar and Gujarat. The average productivity of wheat in India was to the tune of 3216 kg/ha. In Gujarat, the average productivity of wheat was 2751 kg/ha (Anon., 2018) [2] which is lower than northern states like Punjab and Haryana as the shorter duration of winter season in Gujarat does not provide much congenial climatic condition for its growth. Another major factor responsible for low productivity in wheat is weed infestation because it competes with crop for all necessary resources viz., soil moisture, nutrient, sunlight and space. Weed infestation also leads to deteriorate quality of crop product and hazardous to human and animal health also. Improper weed management or Uncontrolled weeds are reported to cause up to 66% reduction in wheat grain yield (Angiras et al. 2008) [1] . As the crop is badly infested with narrow and broad leaved weeds like Parthenium hysterophorus, Portulaca oleracea, Euphorbia mollis, Amaranthus viridis, Convolvulus arvensis, Commelina benghalensis, Chenopodium album, Cyperus rotundus and Sonchus arvensis etc., those are appears regularly because of intensive cultivation with frequent irrigation and dominance of monotony cropping system. However, continuous use of same herbicide with improper dose and faulty application can leads to develop weed resistance to herbicides. Avoidance of weed resistance to herbicide and effective control of weed flora is possible through using herbicide combination because it require lower dose, broad spectrum and increase the activity on targeted weed without causing any crop injury and also cost effective and time saving as compared to hand weeding and mechanical method. Looking to this the experiment was planned. Materials and methods The experiment was conducted at the farm of AICRP-Weed Management, B. A. College of Agriculture, Anand Agricultural University, Anand (Gujarat) during rabi-summer season of the year 2017-18 and 2018-19 on loamy sand soil. The experiment was laid out in randomized block design with three replication and tried different twelve treatment viz., T 1 : Pendimethalin PE (750 g/ha), T 2 : Pendimethalin + metribuzin (Tank mix) PE (500 + 175 g/ha), T 3 : Pendimethalin PE (500 g/ha) fb sulfosulfuron PoE (18 g/ha), T 4 : Sulfosulfuron PoE (25 g/ha), T 5 : Sulfosulfuron + 2,4-D (SS) (Tank mix) PoE (25 + 250 g/ha), T 6 : Sulfosulfuron +