Production of Bt and non-Bt cotton (Gossypium sp.) and french bean (Phaseolus vulgaris) intercropping system in northern transition zone of Karnataka

摘要

Intercropping combinations of Bt and non-Bt cotton (Gossypium sp.) and french bean (Phaseolus vulgaris L.) were studied between 2005-06 and 2006-07 at Dharwad to compare productivity, economics and energetics, under rainfed condition in northern transition zone of Karnataka. French bean was grown for grain and vegetable purpose with Bt and non-Bt cotton in 2 row ratios (1:2 and 1:3), 4 sole crops (french bean for grain and vegetable, Bt-and non-Bt cotton) and Bt-non-Bt cotton + soybean (recommended intercropping of this area) were evaluated. Intercropping of Bt-cotton + french bean in 1:3 row ratio either for grain or vegetable recorded significantly higher cotton equivalent yield (2.54 and 2.51 t/ha, respectively), land equivalent ratio (1.38 and 1.37, respectively), system productivity index (2.44 and 2.42 t/ha respectively), when compared with other systems. The intercropping of Bt-cotton + french bean in 1:3 row ratio for grain recorded significantly higher area time equivalent ratio (1.16), protein (0.96 t/ha), carbohydrate (0.41 t/ha), energy yield (6.83 x 1.0(6) k cal/ha), net output energy (72.06 x 10(3) MJ/ha) and energy use efficiency (139.92 kg/10(3) MJ) when compared with Bt-cotton + french bean for vegetable in the same row ratio.