Inoculation Experiment of Azospirillum brasilense as Supplement of Urea Nitrogen for Aman Rice Production in Tripura
Roy Mihir Lal1, Srivastava Ramesh C2
1Tripura State Council for Science and Technology, Gorkhabasti, Agartala – 799 006, Tripura (West), India. 2Plant Physiology and Biochemistry Research Laboratory, Department of Botany, Tripura University, Suryamaninagar – 799 130, Tripura (West), India.
The response of inoculation of Azospirillum brasilense as supplement of urea nitrogen was examined in field condition on aman rice production in Tripura. The experiment conducted in paddy field in rainy autumn season (Kharif – Aman, July–Nov) in 2008 with test variety cv NDR–359. Split-plot experimental design with 20 treatments and 3 replications was carried out. Two factors viz four levels of nitrogen fertilizer (20, 40, 60, 80 kg h–1) and three forms of inoculation (seed inoculation, root dipping and basal application) were applied. Substantial increase in all growth parameters, dry matter yield and grain yield parameters was noticed due to inoculation. The finding showed potential of Azospirillum brasilense to save 20 kg N ha–1. At zero or low level of nitrogen fertilizer (20/40 kg ha–1) inoculation of Azospirillum brasilense by root dipping was found more effective and at increased dose of nitrogen fertilizer (60/80 kgha–1), basal application resulted better.