Author(s):

Roopashree M, Rajkumara S, Amrutha TG, Nalina CN, Shilpa HD and Varshitha V

Abstract: A field experiment was carried out in vertisols at Irrigation Water Management Research Centre (IWMRC) Belvatagi, Dharwad during kharif 2015-16 to compare surface and sub surface drip irrigation methods in Bt cotton (Gossypium hirsutum L.) with different Etc. levels.Three levels of drip irrigation viz., irrigation at 1.0 Etc., 0.8 Etc. and 0.6 Etc. and two methods of drip irrigation viz., surface drip and subsurface drip irrigation were compared with alternatively alternate furrow method of irrigation. Sub surface drip irrigation recorded numerically higher seed cotton yield (3,109 kg ha^-1) compared to surface drip irrigation (2,758 kg ha^-1). Etc. levels did not influence seed cotton yield significantly. Interaction effect of method of irrigation and Etc. levels was significant. Sub surface drip irrigation with1.0 Etc. significantly increased plant height (98.08 cm), number of monopodia (3.58), number of sympodia (17.68), total number of bolls per plant (39.03) and seed cotton yield (3,471kgha^-1). Similarly higher water use efficiency was recorded at 0.6 Etc. 6.87 kg ha^-1-mm over 0.8 and 1.0 Etc. (29.3 and 43.4 per cent increase respectively).

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