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Field experiments were conducted at Zonal Agricultural Research Station, Gandhi Krishi Vignana Kendra, University of Agricultural Sciences, Bangalore during rabi 2020 and summer 2021 coming under eastern dry zone of Karnataka to study the efficiency of different herbicides and allelochemicals for weed management in direct seeded rice. The experiment consisted of 12 treatments replicated thrice in RCBD design. Among various herbicide treatments, significantly lowest total weed density and dry weight was recorded with Bispyribac sodium 10 SC @ 40 g a.i. ha-1 as post emergence (17.3 no. m-2 and 5.1 g m-2, respectively) and found on par with Bensulfuron methyl + pretilachlor 6.6 G @ 660 g a.i. ha-1 as pre emergence (19.3 no. m-2 and 6.9 g m-2, respectively). Significantly higher paddy grain and straw yield was recorded with Bispyribac sodium 10 SC @ 40 g a.i. ha-1 as post emergence (4987 and 6844 kg ha-1, respectively) followed by Bensulfuron methyl + pretilachlor 6.6 G @ 660 g a.i. ha-1 as pre emergence (4866 and 6716 kg ha-1, respectively) and it was on par with hand weeding at 20 and 40 DAS (5139 and 6960 kg ha-1, respectively). Lowest grain and straw yield was recorded in unweeded control (688 and 1485 kg ha-1, respectively). Application of Bispyribac sodium 10 SC @ 40 g a.i. ha-1 as post emergence has recorded higher net returns (Rs.54581 ha-1) with B: C ratio of 2.61. [ABSTRACT FROM AUTHOR]

Field experiments were carried out in summer 2017 and 2018 at Zonal Agricultural Research Station (ZARS), University of Agricultural Sciences, GKVK, Bengaluru, India on red sandy loam soil. The main objective was to evaluate the impact of rice grown in aerobic conditions intercropped with leafy vegetables on weed management, wherein the sole rice and intercrops of four leafy vegetables: palak (Spinacia oleracea L.), coriander (Coriandrum sativum L.), amaranth (Amaranthus spp L.), methi (Trigonella foenum-graecum L.) were designed in randomized complete block design (RCBD) of 9 treatments replicated four times. The results revealed that the greater the crop biomass, the higher the weed suppression achieved. Sole rice was densely populated by weeds and also had higher weed biomass compared to the intercrops. However, intercrops suppressed efficiently the weeds, increased growth and rice equivalent yield over the sole rice crop. The intercropping systems with leafy palak (spinach) were the most suppressive of weeds. The rice + leafy vegetable palak recorded significantly lower weed density (138.4 no. m-2), dry weight at harvest (148.04 g m-2), higher rice grain, rice straw and palak leaf yield (7651; 9687 and 25508 kg ha-1, respectively) and higher net monetary return (₹ 156269 ha-1) over the sole rice. [ABSTRACT FROM AUTHOR]

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