Journal of FARM SCIENCES, Vol 28, No 1 (2015)

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Productivity and profitability of Bt cotton as influenced by refuge crops or cropping systems management under irrigation

M.A. Basavanneppa, V.V. Angadi, D.P. Biradar

Abstract


A field trial was conducted at the Agricultural Research Station, Siruguppa for two successive kharif seasons (2007-08 and 2008-09) to study the refuge crop management in Bt cotton under irrigated situation. The trial was laid out in Randomized Complete Block Design with seven treatments viz., (T1)  Bt cotton (100%), (T2) Bt cotton (80%) + non-Bt cotton (20% as border crop as per GEAC  recommendation), (T3) Bt cotton + non-Bt cotton (8:2 row proportion), (T4) Bt cotton + okra-chickpea (8:2 row proportion), (T5) Bt cotton + pigeonpea (8:2 row proportion), (T6) Bt cotton + maize (One week advance sowing)- chickpea (8:2 row proportion), (T7) Bt cotton + maize (simultaneous sowing)- chickpea (8:2 row proportion). Results revealed that significantly higher seed cotton yield (1942 kg ha-1) was recorded in T1 (100% Bt cotton) than other treatments. Significantly higher Bt cotton equivalent yield (BCEY) (2446 kg ha-1) and gross returns (` 68481 ha-1) were recorded in T4 (Bt cotton + okra-chickpea (8:2 row proportion)) and it was on par with T1 (100% Bt cotton) (2427 kg ha-1 and gross returns of ` 67957 ha-1) as compared to rest of treatments. Significantly higher net returns (` 46962 ha-1) and BC ratio (3.24) were registered in T1 (100% Bt cotton) as compared to rest of refuge crops or cropping systems and it was on par with T4 (Bt cotton + okra-chickpea (8:2 row proportion)). So, it is suggested to adopt Bt cotton with okra-chickpea (8:2 row proportion) for higher production and monetary benefits.

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