Efficacy of weed management practices in transplanted rice under southern dry zone of Karnataka

Dhanapal, G. N.; Bai, S. Kamala; Sanjay, M. T.; Nagarjun, P.; Sandeep, A.

doi:10.5958/0974-8164.2018.00063.1

Cited by 4 publications

(8 citation statements)

References 3 publications

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“…Significantly higher weed density was noticed in weedy check which was attributed to initial deposition of weed seeds in the soil from the previous seasons which has led to increased weed seed bank in the soil which is undisturbed for any activity after sowing. These findings are in accordance with the findings of Dhanapal et al [11].…”

Section: Weed Density (No M -2 )supporting

confidence: 94%

Bio-Efficacy of Post Emergent Herbicides on Weeds in Direct Seeded Rice (Oryza sativa L.)

Bindushree,

Ramesha,

Siddaram

et al. 2023

IJECC

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A field experiment was conducted to study the bio-efficacy of post emergent herbicides on weeds in direct seeded rice in medium black clay soil at Agricultural Research Station, Dhadesugur, University of Agricultural Sciences, Raichur, Karnataka during Kharif 2022. The experiment was laid out in Randomized complete block design with three replications. There were eight treatments consisting of five post emergent herbicides sprayed at 25 DAS, hand weeding at 20 and 40 DAS, weed free check and weedy check in direct seeded rice and the variety RNR 15048 was used in this trial. Application of cyhalofop butyl 5.1 % + penoxsulam 1.02 % OD @ 2000 ml ha-1 recorded significantly lower weed density, weed dry weight, weed index and higher weed control efficiency compared to all the other treatments. It also produced higher number of productive tillers (409.4 m-2), panicle weight (3.89 g), filled grains per panicle (243.1), lower number of unfilled grains per panicle (8.4), higher grain yield (6058 kg ha-1) and straw yield (6935 kg ha-1) in direct seeded rice. So it can be concluded that application of cyhalofop butyl 5.1 % + penoxsulam 1.02 % OD @ 2000 ml ha-1 at 25 DAS (weeds at 2-3 leaf stage) was most effective in managing the weeds with higher weed control efficiency. It also resulted in higher growth and yield components of direct seeded rice leading to higher grain yield.

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Section: Weed Density (No M -2 )supporting

confidence: 94%

Bio-Efficacy of Post Emergent Herbicides on Weeds in Direct Seeded Rice (Oryza sativa L.)

Bindushree,

Ramesha,

Siddaram

et al. 2023

IJECC

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“…The increase in rice grain yield over weedy check owing to different treatments was attributed to the reduced density and biomass of weeds at all stages of crop growth, which re-sulted in increased dry matter of rice and number of panicles/m 2 . These results confirm the findings of Dhanapal et al (2018) and Sunil et al (2010), who reported 50-75% increase in grain yield of rice owing to sequential application of pre-and post-emergence herbicides as compared to unweeded check. Reduced competition for moisture, space, light and nutrients between crop and weeds along with effective suppression of weeds by combination of herbicides has helped in obtaining higher yield in both the years, as also reported by Upasani et al (2012).…”

Section: Growth and Yield Of Aerobic Ricesupporting

confidence: 91%

“…The WCE at 30 and 60 DAS was the maximum in hand-weed thrice at 20, 40 and 60 DAS and this was closely followed by pyrazosulfuron ethyl @ 25 g/ha (pre) fb bispyribac sodium @ 25 g/ha (post) in 2014 and 2015, and this was the best treatment among the herbicides in terms of higher WCE (Tables 3 and 4). Our results support the findings of Dhanapal et al (2018) and Ramesha et al (2019). The pre-emergence application of herbicides followed by 1 hand-weeding at 40 DAS were failed to control the all types of weeds due to weed growth during critical period of crop growth (Yogananda et al 2019).…”

Section: Weed-control Efficiencysupporting

confidence: 84%

“…There was a considerable reduction in weed emergence at the initial crop-growth stage due to pre-emergence application of herbicides, resulting in vigorous seedling establishment, However, the later emerging weeds were effectively controlled by bispyribac-sodium (post). The initially vigorous crop stand provided spatial advantage to crop in suppressing the weeds below threshold level even at later stages Dhanapal et al (2018).…”

Section: Weed Dry Weightmentioning

confidence: 99%

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Performance of sequential application of pre and post-emergence herbicides for management of weeds in aerobic rice (Oryza sativa)

S.B. YOGANANDA,

P. THIMMEGOWDA,

G.K. SHRUTHI

2022

IJA

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A field experiment was conducted during the rainy (kharif) season of 2014 and 2015 at Zonal Agricultural Research Station, V.C. Farm, Mandya, Karnataka, India, to study the performance of sequential application of herbicides in aerobic rice (Oryza sativa L.). Among the weed-management practices, hand-weeding at 20, 40 and 60 days after sowing (DAS) resulted in significantly lower density and dry weight of all categories of weeds, ensuing higher grain yield (5.57 and 5.42 t/ha, respectively); this was closely followed by pre-emergence application of pyrazosulfuron ethyl @ 25 g/ha and by post-emergence application of bispyribac-sodium @ 25 g/ha at 20 days after sowing (5.20 and 5.12 t/ha, respectively) during both the years. However, the higher net returns (`48,210 and 47,040/ha, respectively) and benefit: cost ratio (2.62 and 2.58, respectively), during both the years were obtained from sequential application of herbicide treatment. Uncontrolled weed growth caused about 51% reduction in grain yield of aerobic rice during 2014 and 2015.

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“…The stale seedbed technique should not be viewed as a stand-alone treatment that maintains weed suppression during the entire cropping cycle and thus may often require it be part of an integrated weed management (IWM) programme. Herbicide combinations consisting of two or more herbicides having greater activity on diverse weed flora due to differential modes of action have become ~ 417 ~ popular in recent years (Dhanapal et al, 2018) [4] . The new generation herbicides that are available in the market are essential for better weed control.…”

Section: Introductionmentioning

confidence: 99%

Studies on the effect of stale seedbed technique and herbicides in transplanted rice

Karri,

Balasubramanian

2024

Int. J. Res. Agron.

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Nadu during Late samba season (September, 2022 -February, 2023 in a randomized block design with nine treatments and replicated thrice. Among the different treatments, Stale seedbed technique fb Hand weeding which is statistically on par with Stale seedbed technique fb Triafamone 20% + ethoxysulfuron 10% WG @ 220 g ha -1 at 8 DAT recorded the lower weed count, weed dry matter production and the higher weed control index favouring higher growth attributes and grain yield of rice while maximum nutrient uptake was recorded under weed free check. Higher plant height, dry matter production and higher grain yield were recorded under the treatment Stale seedbed technique fb one hand weeding at 25 DAT practice might be due to maintenance of weed free environment, particularly throughout vital growth stages of crop, cut back crop weed competition helped in higher growth and development leading to higher grain yield.

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Efficacy of weed management practices in transplanted rice under southern dry zone of Karnataka

Cited by 4 publications

References 3 publications

Bio-Efficacy of Post Emergent Herbicides on Weeds in Direct Seeded Rice (Oryza sativa L.)

Bio-Efficacy of Post Emergent Herbicides on Weeds in Direct Seeded Rice (Oryza sativa L.)

Performance of sequential application of pre and post-emergence herbicides for management of weeds in aerobic rice (Oryza sativa)

Studies on the effect of stale seedbed technique and herbicides in transplanted rice

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