Water - weed interactions in aerobic rice

Akhil T. Thomas, Deepa Thomas, Mini Abraham, C. George Thomas

Abstract


A field study was undertaken at Agronomic Research Station, Chalakudy, Kerala for developing suitable water and weed management strategies for aerobic rice. The trial was laid out with three levels of irrigation in the main plot [irrigation at 10, 20 and 30 mm CPE (cumulative pan evaporation)] and five weed management treatments in the subplot (pre emergent herbicide oxadiargyl followed by hand weeding, 2,4- D sodium salt or bispyribac sodium at 20 days after sowing (DAS), hand weeding at 20 and 40 DAS and unweeded control). Irrigation at 10 mm CPE increased crop growth, but reduced weed growth. Less irrigation (30 mm CPE) favoured the growth and density of grasses and broad leaf weeds and produced the highest weed dry matter. Sedge population was more in frequently irrigated plot (10 mm CPE). Moisture stress in 30 mm CPE resulted in 44 per cent yield loss. Weed competition caused 64 per cent yield reduction. Both water and weeds together accounted for 85 per cent yield reduction. Irrigation at 10 mm CPE recorded the highest grain yield and weed control efficiency, but lowest water productivity. Among weed management practices, hand weeding at 20 and 40 DAS recorded the highest grain yield, weed control efficiency and water productivity. However, application of oxadiargyl followed by bispyribac sodium resulted in better water productivity and recorded highest B:C ratio.

Keywords


Aerobic rice, Water productivity, Weed control efficiency

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References


Ahmed, S., Salim, M., and Chauhan, B.S. 2014. Effect of weed management and seed rate on crop growth under direct dry seeded rice systems in Bangladesh. PloS One, 9(7): p.e101919.

Bouman, B.A.M. and Tuong, T.P. 2001. Field water management to save water and increase its productivity in irrigated lowland rice. Agric. Water Manage.49(1): 11-30.

Fukai, S. and Inthapan, P. 1988. Growth and yield of rice cultivars under sprinkler irrigation in south-eastern Queensland. Aust. J. Exp. Agric. 28(2):249-252.

Jincy V.S.,Shalini Pillai P., and John, J. 2014. Aerobic rice: an option to improve the water productivity of rice. In: Proceedings of the International Symposium on Integrated Water resource management, 19-21 Feb 2014, Kozhikode, India.

Kondo, M., Murty, M.V.R., Aragones, D.V., Okada, K., Winn, T., and Kawak, K.S.1999. Characteristics of the root system and water uptake in upland rice. J. Exp. Bot. 25:117-134.

Lafitte, H.R. and Bennett, J. 2002. Requirements for aerobic rice: physiological and molecular considerations. In: Bouman, B.A.M., Hengsdijk,H., Hardy, B., Bindraban, P.S., Tuong, T.P., and Ladha, J.K. (eds), Water Wise Rice Production. Los Banos, Philippines, International Rice Research Institute, Philippines,pp.259-274.

Mahajan, G., Chauhan, B.S., Timsina, J., Singh, P.P. and Singh, K. 2012. Crop performance and water-and nitrogen-use efficiencies in dry-seeded rice in response to irrigation and fertilizer amounts in northwest India. Field Crops Res. 134:59-70.

Pasha, M.L., Reddy, M.D., Reddy, M.G., and Devi, M.U. 2013. Influence of irrigation schedule, weed management and nitrogen levels on grain yield, nutrient uptake and. Indian J. Agric. Res. 47(1): 26-34.

Singh, S., Ladha, J.K., Gupta, R.K., Bhushan, L., and Rao, A.N. 2008. Weed management in aerobic rice systems under varying establishment methods, Rice-Wheat Consortium for the Indo-Gangetic Plains, CIMMYT-India, Crop Prot. 27: 660-671.

Thomas, C.G. 2010. Land Husbandary and Water Shed Management. Kalyanipublishers,Ludhiana, 693p.

Thomas, C.G., and Abraham, C.T. 1998. Common Weeds in Rice Ecosystems of Kerala and Their Management. Kerala Agricultural University, Thrissur, 80p


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A KAU publication [CODEN: JTAGEI; ISSN 0971-636X; eISSN 0973-5399]