Influence of integrated weed-management practices on productivity and profitabil- ity of wet-seeded rice (Oryza sativa)
DOI:
https://doi.org/10.59797/ija.v53i1.4835Keywords:
Productivity, profitability, Weed management, Wet-seeded riceAbstract
A field experiment was conducted at Coimbatore during 2000-2001 and 2001-2002 to study the effect of seeding methods (surface and anaerobic), in-situ incorporation of dhaincha (Sesbania aculeata) and time of pretilachlor-plus application on productivity and profitability of wet-seeded rice (Oryza sativa L.). Treatments in- cluded two seeding methods, viz. surface wet seeding and anaerobic seeding, with two intercropping levels, viz. sole rice and rice + dhaincha; and four weed-control treatments, viz. pretilachlor-plus @ 0.30 kg/ha 2 days after sowing (DAS) followed by (fb) 1 hand-weeding (HW) at 45 DAS, pretilachlor-plus @ 0.30 kg/ha 5 DAS fb 1 hand- weeding at 45 DAS, hand-weeding twice at 20 and 45 DAS, and unweeded check. Surface and anaerobic drill seeding were comparable in terms of weed density, growth and productivity of rice. Conjoint cropping of rice + dhaincha and incorporation of the latter at 37 DAS using con0 weeder proved better in terms of reducing the total weed density, increasing the crop growth, productivity (5.1 tlha) and weed-smothering efficiency (25.5%) of wet- seeded rice. Pre-emergence application of pretilachlor-plus @ 0.30 kg/ha on 2 DAS + hand-weeding at 45 DAS registered lower total weed density (53.6/m2) and higher weed-control efficiency, as well as markedly improved the growth and yield parameters and grain yield (5.6 ttha). Anaerobic seeding, rice + dhaincha and pretilachlor-plus at 2 DAS gave better profit (Rs 13,892lha). It was concluded that anaerobic seeding, dual cultivation of rice + dhaincha and pretilachlor plus @ 0.30 kg /ha on 2 DAS + hand-weeding at 45 DAS is an efficient method for im- proving weed control, productivity and profitability of wet-seeded rice.References
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Ravisankar, N., Raja, R., Din, M., Elanchezhian, R. and Chaudhuri,
S. Ghoshal. 2007a. Evaluation of green manure intercropping in wet-seeded and transplanted rice under Island ecosystem, Oryza 44(3): 231-233.
Ravisankar, N., Raja, R., Din, M., Elanchezhian, R. and Chaudhuri,
S. Ghoshal. 2007b. Response of rice (Oryza Sativa) varieties and super rice cultures to anaerobic wet seeding in Bay Is- lands. Indian Journal ofAgriculturalSciences 77(1): 14-17.
Suganthi, M., Kandasamy, O.S., Subbian, P. and Jayakumar, R. 2005. Relative efficacy of pretilachlor 50 EC for weed control in lowland transplanted rice-rice cropping system. Indian Jour-
ratio (2.16) than at 5 DAS and hand-weeding (Table 3). nal of Weed Science 37(1-2): 105-106.
i Awan, Tahir Hussain, Inalyat Ali, Safdar, M. Ehsan, Ashaf Mirza
M. and Yaqub, Muhammad. 2007. Economic effect of differ- ent plant establishment techniques on rice (Oryza sativa) production. Journal of Agricultural Research 45(1): 73-81.
Balakrishnan, M., Ravisankar, N., Meena, K., Elanchezhian, R. and Zami~,Ahmed S.K 2007. Yield prediction though feed for- ward neural network approach for direct seeded rice (Olyza sativa) in Bay Islands. In: Proceedings of YdIndian Znterna- tional Conference on Artificial Intelligence (IICAI-07) NU, held at Pune, during 17-19, December, pp.1533-1541.
Bhandari, D.C. 1981. Weed vegetation analysis. In: Paper pre- sented at Cropping System Training Programmes, Interna- tional Rice Research Institute, Los Banos, Philippines.
Borlagdan, P.C., Yamauchi, M., Quick, G.R. and Aragones, D.V. 1993. Design and development of anaerobic seeder for direct seeding of rice. Philippine Technology Journal 18(3): 77-95.
Milberg, P and Hallgren, E. 2004.Yield loss due to weeds in cereals and its large-scale variability in Sweden. Field Crops Re- search 86(2-3): 199-209.
Ravisankar, N., Raja, R., Din, M., Elanchezhian, R. and Chaudhuri,
S. Ghoshal. 2007a. Evaluation of green manure intercropping in wet-seeded and transplanted rice under Island ecosystem, Oryza 44(3): 231-233.
Ravisankar, N., Raja, R., Din, M., Elanchezhian, R. and Chaudhuri,
S. Ghoshal. 2007b. Response of rice (Oryza Sativa) varieties and super rice cultures to anaerobic wet seeding in Bay Is- lands. Indian Journal ofAgriculturalSciences 77(1): 14-17.
Suganthi, M., Kandasamy, O.S., Subbian, P. and Jayakumar, R. 2005. Relative efficacy of pretilachlor 50 EC for weed control in lowland transplanted rice-rice cropping system. Indian Jour-
ratio (2.16) than at 5 DAS and hand-weeding (Table 3). nal of Weed Science 37(1-2): 105-106.
