Vidyavathi, G. Yadahalli, Ravi M.V2, G.S. Yadahalli and Shivaleela S. Kukanur
Abstract
The suitable method of fertilizer application for Bt Cotton was studied in deep black soils of Shahapur and Shorapur taluks of Yadagir district in North-Eastern Dry Zone of Karnataka under Upper Krishna Command Project area during 2010 11 and 2011 12. The results (pooled over two years) indicated that cotton seed and dry matter yield was recorded significantly higher in the STCR approach (29.8 q/ha and 48.8 q/ ha, respectively) as compared to all other treatments and was followed by NK + 50 % & P + 25 % (27.9 and 44.8 q/ha respectively). The per cent increase in seed yield was 49 % with application of fertilizer by STCR approach followed by NK + 50 % & P + 25 % (40 %) over other treatments. The discounted net returns and B: C ratio was significantly higher in treatment receiving fertilizer by STCR approach (Rs.166788 and 4.55/ ha, respectively). This was followed by soil test based NK + 50 % & P + 25 % (Rs. 155896 and 4.43/ha, respectively). Soil available nutrients were also found significantly higher with STCR approach fertilizer recommendation.