A field experiment was conducted at the Rajasthan College of Agriculture, Maharana Pratap University of Agriculture and Technology -Udaipur during Kharif season 2015 and 2016 to test the efficacy of different herbicide and herbicide mixtures against weeds in soybean. Monocot weeds were predominant (57.68 %) in the experimental field compared to Broad leaved weeds (42.31 %). However, Echinochloa colona (40.55 %) and Corchorus olitorius (23.68%) were dominant in soybean at 30 DAS. Among different weed control treatments, post-emergence and tank mix combination of propaquizafop + imazethapyr (75+75 g ha-1) and imazethapyr + quizalofop-ethyl (75+60 g ha-1) at 21 DAS were most effective in respect of reducing weed density, weed biomass, nutrient removal by weed and improving yield attributes, yield and quality of soybean compared to other treatments. Highest seed yield (2271 kg ha-1), Haulm yield (3127 kg ha-1) of soybean and maximum net return ( 51550/ha) were also recorded with propaquizafop 75 g ha-1 + imazethapyr 75 g ha-1 followed by imazethapyr + quizalofop-ethyl (75+60 g ha-1). Further, they were also found responsible for highest uptake of N, P and K in soybean and lowest uptake of these plant nutrients by weeds.

Background: A field experiment was conducted at the Instructional Farm of Rajasthan College of Agriculture, Maharana Pratap University of Agriculture and Technology, Udaipur during Rabi 2016-17 and 2017-18 to study the weed flora, growth, yield and economics of fenugreek. The experiment was laid out in split plot design with three replications having Fenugreek variety RMT-305 (25 kg ha-1) and RDF of 40 kg N and 40 kg P2O5 ha-1 (basal dose through urea and DAP). Methods: Herbicide applied as pre-emergence (PE) at one day after sowing, while post-emergence (PoE) application at 2-4 leaf stage of weeds (21 DAS) with knapsack sprayer having flat fan nozzle using 500 liters of water ha-1. Result: The pooled results revealed that pre-emergence application of oxadiargyl 100 g/ha fb hoeing at 40 DAS recorded significantly higher weed control efficiency (82.3%), plant height (59.83 cm), number of branches (6.09), number of pods (44.86), number of seeds/pod (17.33), seed weight (9.05 g/plant) of fenugreek. Also, significantly maximum seed yield (2.82 t/ha), haulm yield (6.70 t/ha) and harvest index (29.7%) of fenugreek was recorded under oxadiargyl 100 g/ha PE fb hoeing at 40 DAS which was at par with weed free treatment. Significantly higher net returns (98158 `/ha) and B C ratio (2.63) was obtained with application of oxadiargyl 100 g/ha Pre-Emergence (PE) fb hoeing at 40 DAS. Residual effect of herbicides used in fenugreek did not showed any phytotoxic effect on succeeding summer fodder maize in terms of visual phytotoxicity rating at various growth stages of maize, weed flora, dry matter of weeds as well as crop at 30 DAS and green fodder yield of summer fodder maize.