A field experiment was conducted during kharif season of 2013-14 at department of Agronomy farm, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, to study the productivity and nitrogen use efficiency in cotton using organic nitrification inhibitors. The experiment was laid out in factorial randomized block design with three replications each having nine treatment combinations comprising three fertilizer levels viz., 75% RDF (F1), 100% RDF (F2) and 125% RDF (F3) and three nitrification inhibitors viz., neem cake @ 300 kgha-1 (N1), karanj cake @ 300 kgha-1 (N2) and control (N3). The result showed that various all growth attributes were higher in F3 over F1 and which at par with F2. In case of yield attributes and yield were significantly higher in F3over F2 and F1. Uptake of NPK kg ha-1 after harvest of cotton crop was significantly higher in F3over F2 and F1. Significantly highest nitrogen use efficiency was recorded with fertilizer level F1as compared to F2 and lowest nitrogen use efficiency was recorded with F3. Amongst nitrification inhibitors, N2 increases potentiality of growth characters, yield attributes, uptake of NPK and NUE as compared to control and at par with N1. Interaction effect between fertilizer level and nitrification inhibitors were found to be non significant at all growth attributes and uptake of nutrient but was significant in respect of seed cotton yield.
