<div>Background: Soybean being a rainy season crops, is heavily infested with weeds thus ultimately affect the crop yield and economic return. 
 
Methods: Field experiment was conducted at Birsa Agricultural University, Ranchi during rainy season of 2019 and 2020 under randomized block design replicated thrice with eight different weed control methods viz., imazathapyr 75 g/ha at 20 days after sowing (DAS), imazathapyr 35% + imazamox 35% ready mix (RM) 75 g/ha at 20 DAS, quizalofop ethyl 50 g/ha at 20 DAS, sodium acifluorfen 16.5% + clodinafop propargyl 8% (RM) 125 g/ha at 20 DAS, imazathapyr 2% + pendimethalin 30% (RM) 1 kg/ha at 20 DAS, hand weeding at 20 and 40 DAS, weed free (three hand weeding at 20, 40 and 60 DAS) and weedy check.&nbsp; 
 
Result: Among herbicides, application of quizalofop ethyl 50 g/ha recorded higher growth and yield attributes of soybean due to reduced weed density and weed dry matter which resulted in higher weed control efficiency, weed management index, agronomic management index, thereby recorded maximum soybean yield (2065 kg/ha), net return (₹ 54,743/ha) and B:C ratio (2.50). The soybean yield was negatively correlated with weed dry matter particularly with grassy as well as total weed dry matter while plant dry matter accumulation was strongly correlated with soybean yield.</div>

Weed Dynamics, Growth, Yield and Correlation Study as Affected by Weed Control Methods in Soybean [Glycine max (L.) Merril.]

<div>The present study was conducted in kharif seasons of 2015, 2016 and 2017 at experimental farm of Rajasthan Agricultural Research Institute, Durgapura, Jaipur (Rajasthan) to study efficacy of different weed management practices in clusterbean. Three years result shows that compared to weedy check (6.82 m-2) application of Pendimethalin @ 0.75 kg a.i. ha-1 as PE fb one hand weeding recorded lowest weed density (3.58 m-2). Among herbicidal treatments, Pendimethalin @ 0.75kg a.i/ha as PE fb one hand weeding at 25 DAS (83.7%) and Pendimethalin @ 0.75 kg a.i./ha as PE+ Imazathapyr+ Imazamox @ 40g a.i./ha PoE (74.0%) recorded highest weed control efficiency. Likewise, application of Pendimethalin @ 0.75kg a.i/ha as PE fb one hand weeding at 25 DAS and Pendimethalin 0.75kg/ha at PE fb Imazathapyr + Imazamox @ 40g a.i. ha-1 recorded significantly higher seed (1136 kg ha-1 and 1009 kg ha-1), haulm (3304 kg ha-1 and 2943 kg ha-1) and biological yield (4440 kg ha-1 and 3953 kg ha-1), respectively over other herbicidal treatments. Economic evaluation indicated that application of Pendimethalin @ 0.75kg a.i/ha as PE fb one hand weeding at 25 and which was followed by with Pendimethalin @ 0.75 kg a.i./ha as PE+ Imazathapyr+ Imazamox@ 40g a.i./ha recorded, gross return (INR 55352 ha-1 and INR 49189 ha-1) net returns (INR 38852 ha-1 and INR 34289 ha-1) and B:C ratio (2.35 and 2.20), respectively. Whereas, minimum cost of cultivation (INR 10000 ha-1) and gross returns (INR 25632 ha-1), net returns (INR 15632 ha-1) and B:C ratio (1.56) were recorded under weed check. So looking to the laborious pressure of hand weeding, cost effectiveness ease of application of chemical herbicides, application of Pendimethalin 0.75 kg ha-1 fb one hand weeding can be an effective weed control option in cluster bean crop with higher seed and haulm yield under Semi-arid and Arid regions of Rajasthan.</div>

Weed Dynamics, Growth, Yield and Correlation Study as Affected by Weed Control Methods in Soybean [Glycine max (L.) Merril.]

Effect of Different Weed Management Practices on Weed Dynamics, Productivity and Farm Profitability of Cluster Bean