Response of rice (Oryza sativa) varieties to different levels of nitrogen under rainfed aerobic ecosystem

摘要

A field experiment was conducted during 2011 and 2012 at Jagdalpur on the response of rice (Oryza sativa L) varieties to different levels of nitrogen. Plant height, leaf area-lndex, root volume and dry matter production were the highest with ‘Tulsi’at 90 kg N/ha. Panicles/m~2, filled grains/panicle, grain (4.50 tonnes/ha) and straw yield and nitrogen uptake by grain and straw were also significantly higher with Tulsi’. Increasing levels of nitrogen enhanced panicles/m~2, filled grains/panicle, grain and straw yield and nitrogen uptake by grain and straw only up to 90 kg N/ha. Varieties and nitrogen levels interacted significantly and the highest grain yield and economics were recorded with Tulsi’ at 90 kg N/ha and it was found to be optimum combination for aerobic rice.