No abstract

The present study aimed to assess the effect of macronutrient mixtures on growth and yield of cotton, in farmer's field, Deenampalayam taluk of Coimbatore district, Tamil Nadu. The treatments comprised of NPK fertilizer mixtures having different nitrogenous fertilizers (urea, Calcium Nitrate (CN)), phosphatic fertilizers (Single Superphosphate (SSP)), potassic fertilizers (Muriate of Potash (MOP), Sulfate of Potash (SOP)), NP (Di-ammonium Phosphate (DAP), Mono Ammonium Phosphate (MAP), Ammonium Sulfate Phosphate (ASP)) with control. Application of CN + DAP + MOP (T5) as NPK sources to meet out the recommended dose of fertilizers for cotton registered maximum plant height (124.9 cm), number of sympodial branches (12.9), leaf area index (2.84), and dry matter production (8888 kg ha-1) at boll bursting stage of the crop. Highest kapas yield of 2118 kg ha-1 was recorded by the treatment T5, followed by T7 (Urea + DAP + CN + SSP + MOP) (1957 kg ha-1). Plants supplied with treatment T5 registered highest number of bolls (39.5) and boll weight (7 g). With regard to B:C ratio, highest B:C ratio of 1.70 was obtained with multiple sources of nitrogenous, phosphatic fertilizers and MOP (T7).