Singh, V.K.Saha, Pritam2021-01-292021-01-292020-11https://krishikosh.egranth.ac.in/handle/1/5810160688A field experiment was conducted during kharif season of 2019 in pulse agronomy (D6) block of N.E. Borlaug crop research centre of G.B pant University of Agriculture and Technology, Pantnagar (UK) to evaluate the efficacy of different post emergence herbicides application on weeds and growth, yield and quality of urdbean. Pantnagar enjoys sub humid, sub tropical climate with hot and dry summer and severe cold winters. The soil of experimental field was silty clay loam having high organic carbon(0.76 %), medium available nitrogen (315.6 kg N /ha) and available potassium(266.7 kg k /ha) but high available phosphorus (26.4 kg P/ha) contents with neutral in reaction(pH-6.9).The experiment,comprising of 10 treatments ( viz; unweeded control (T1), hand weeding, 20 and 40 DAS(T2) pendimethalin at 1 kg / ha, PE (T3),pendimethalin at 1 kg / ha, PE + hand weeding, 20 DAS (T4) ,propaquizafop at 33.33 g + imazethapyr 50 g / ha (Ready mix ), PoE, 20 DAS(T5) , aciflourfen sodium at 140 g + clodinafop propargyl 70 g / ha (Ready mix), PoE, 20 DAS(T6), Fomesafen at 220 g + fluazifop - p - butyl 220 g / ha (Ready mix), PoE, 20 DAS(T7), Pendimethalin 1 kg / ha as PE + propaquizafop 33.33 g + imazethapyr 50 g / ha (Ready mix), PoE, 20 DAS(T8), pendimethalin 1 kg / ha as PE + aciflourfen sodium 140 g + clodinafop propargyl 70 g / ha (Ready mix), PoE, 20 DAS(T9), pendimethalin 1 kg / ha as PE + fomesafen 220 g + fluazifop -p-butyl 220 g / ha (Ready mix), PoE, 20 DAS(T10) was laid out in Randomized Block Design with three replications. Variety pant u-31 was sown in rows , 30 cm apart, on july 24,2019 and harvested on oct. 24, 2019. Cyperus rotundus and Echinochloa colona were the pre-dominant weeds species in the experiment field contributing 33 and 27 per cent to the total weed density and 28.5 and 23 per cent to total dry matter of weeds. Effective control of weeds (in terms of weed density, dry matter of weeds and weed control efficiency ) was achieved in hand weeding, 20 and 40 DAS, followed by pendimethalin 1 kg / ha as PE + fomesafen 220 g + fluazifop -p-butyl 220 g / ha (Ready mix), PoE, 20 DAS (T10).Nutrients ( N,P,K) uptake by weeds was recorded lower under hand weeding twice 20 and 40 DAS followed by pendimethalin 1 kg / ha as PE + fomesafen 220 g + fluazifop -p-butyl 220 g / ha (Ready mix), PoE, 20 DAS (T10) compared to other herbicidal treatments. Hand weeding twice 20 and 40 DAS produced 80.5% more number of pods per plant, 24.8 % higher test weight and 126.4 % more grain yield per plant over unweeded control. Similarly, application of pendimethalin 1 kg/ ha, PE + fomesafen 220 g + fluazifop-p-butyl 220 g / ha PoE , 20 DAS (Ready mix) (T10) recorded 67.3 % more number of pods per plant, 24.8 % higher test weight and 96.4% more grain yield over unweeded control. It was computed that hand weeding twice 20 and 40 DAS yielded 111% higher grain yield (kg/ha) over unweeded control while pendimethalin 1 kg/ ha, PE + fomesafen 220 g +fluazifop-p-butyl220 g / ha PoE , 20 DAS (Ready mix) (T10) increased the grain yield to the tune of 78 % over unweeded control. Hand weeding twice at 20 and 40 DAS recorded significantly higher nutrients (N, P, K) uptake by grain and crop than remaining treatments. Among herbicidal treatments pendimethalin 1 kg / ha as PE + fomesafen 220 g + fluazifop -p-butyl 220 g / ha (Ready mix), PoE, 20 DAS (T10) was recorded higher nutrients uptake by grain and crop. Similar result was found in protein yield. Hand weeding twice 20 and 40 DAS (B:C ratio 2.0)EnglishThesis