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Birsa Agricultural University, Ranchi

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Subject: Agronomy × Author: ., Prerna × End date: 2019 × Start date: 2013 × Type: Thesis ×
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    ThesisItemOpen Access
    EFFICACY OF NEW HERBICIDE IN TRANSPLANTED RICE (Oryza sativa L.)
    (Birsa Agricultural University, Kanke, Ranchi, Jharkhand, 2014) ., Prerna; Singh, M.K.
    “Rice is life” is most appropriate for India as this crop plays a vital role in national food security. Among various production factors, weeds play a vital role in limiting the production of rice as presence of weeds reduces the grain yield by 20-25% in transplanted rice. The present investigation entitled “Efficacy of new herbicide in transplanted rice (Oryza sativa L.)” was carried out during kharif, 2013 at Birsa Agricultural University Farm, Ranchi, Jharkhand on clay loam soil having low in organic carbon (0.37%) and available nitrogen (253.4kg/ha) whereas medium in available phosphorus (15.9kg/ha) and potassium (137.5kg/ha) with moderately acidic ( pH 6.1). The experiment was laid out in a randomized block design with ten treatments replicated four times. Hybrid rice variety PHB -71 was grown as a test crop with spacing of 20cm x15cm. Results showed that among chemical weed control, application of flucetosulfuron 20 or 25g/ha followed by bispyribac sodium 25g/ha had similar reduction in mean weed density (26 and 28/m2, respectively) and weed dry matter (2.06 and 2.16g/m2, respectively) thereby recorded highest mean weed control efficiency (90 and 89%, respectively) at 60 days after transplanting. Application of flucetosulfuron 25g/ha followed by bispyribac sodium 25g/ha accumulated as high dry matter as under weed free situation throughout the crop growth period. The leaf area index was also higher under application of flucetosulfuron alone or in combination with bispyribac sodium 25g/ha throughout the growth period. Application of flucetosulfuron 20g/ha alone or in combination with bispyribac sodium 25g/ha produced almost similar number of effective tillers (272 and 278/m2, respectively) as weed free (295/m2). Similarly, grains per panicle under flucetosulfuron 20g/ha alone or in combination with bispyribac sodium 25g/ha (177 and 180, respectively) was as high as weed free (186) and were significantly higher to mechanical and hand weeding. Grain yield of rice with application of flucetosulfuron 20 or 25g/ha followed by bispyribac sodium 25g/ha was as high (54.58 and 55.88q/ha, respectively) as in weed free (58.48q/ha). Further, application of flucetosulfuron 20g/ha alone at 3 DAT produced similar grain yield (52.68q/ha) as in combination with bispyribac sodium 25g/ha and was significantly higher to application of bispyribac sodium 25g/ha alone as well as hand weeding to the tune of 11and 22%, respectively. Weed free rice crop and application of flucetosulfuron 20g/ha alone had similar net return (₹ 39174 and 36750/ha, respectively) and Beneft: cost ratio (1.38 and 1.46, respectively). Further, application of flucetosulfuron 20g/ha alone had significantly higher net return to the tune of 22 and 42% over mechanical and hand weeding, respectively. Based on the findings of one year experiment, it can be concluded that chemical weed control with application of flucetosulfuron 20g/ha alone at 3 DAT produced almost similar grain yield, net return and benefit: cost ratio as under weed free situation.