Author(s):

G Thiyagarajan, Balaji Kannan, M Manikandan and M Nagarajan

Abstract: Rice is the most stable food crop in the world and in Asiamore than two billion people are getting 60-70% of their food energy from rice and its derived products. Tamil Nadu is one of the biggest producer’s of rice. The Cauvery Delta Zone (CDZ) of the composite Thanjavur district is known as the Rice Bowl of South India. In Cauvery Delta Zone, rice is grown in three seasons <em>viz., Kuruvai </em>(June- September), <em>Samba</em> (August – January) and <em>Thaladi</em> (October-February). Rice is the principal crop of CDZ. Owing to increasing water scarcity, it is highly essential to find out alternate methods of rice cultivation which require less water. One of the approaches that lead to a considerable amount of water saving in rice production is drip irrigation. With this view, research experiment was conducted to standardize the lateral spacing and pestigation techniques for higher productivity of drip irrigated rice at Soil and Water Management Research Institute, Thanjavur. Two lateral spacings <em>viz.,</em> 80 cm and 110 cm of 12 mm diameter lateral with 4 lph drippers spaced at 30 cm apart with four pestigation treatments to control nematode namely soil application of carbofuran (33 kgha^-1), pestigation with carbofuran (33 kgha^-1) and cartaphydrochloride (10 kgha^-1) and control were tested in two rice varieties <em>viz.,</em> CORH 3 and ADT 45 during <em>Kharif</em> 2013 and Summer 2014. Irrigation was given at 150 % PE throughout the crop period in every alternate day. Pestigation with equal splits was given on 10 and 30 DAS. The quantity of water consumed through drip upto 10 days prior to harvest was 977.4 mm (<em>Kharif</em> 2013) and 1104.8 mm (Summer 2014). Among the rice varieties, CORH 3 performed better with higher grain yield of 4932 kg ha^-1which was found superior over ADT 45 with a grain yield of 4698 kg ha^-1. Within the lateral spacings, the 80 cm lateral spacing recorded higher yield of 4935 kg ha^-1 than 110cm lateral spacing (4695 kg ha^-1). Pestigation with carbofuran @ 33kg ha^-1was found to be effective in managing the rice root nematode. Drip layout of 80 cm lateral spacing with 4 lph drippers spaced at 30 cm apart for CORH 3 hybrid rice along with the pestigation of carbofuran @ 33kg ha^-1in equal splits on 10 and 30 DAS found to be the best suitable combination for drip irrigated rice in the CDZ.

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