Effect of different seedling density and amount of nitrogen on yield and agronomic traits ofthe rice promising line8608

In order to determine appropriate planting spaces¡ and nitrogen fertilizer levels on rice promising line 8608¡ a field experiment was carried out at the Rice Research Institute of Iran– Deputy of Mazandaran (Amol) during 2008 and 2009. The experiment was laid out as factorial based on a Randomized Complete Block Design with 3 replications. There were three levels for planting spaces (16×30¡ 20 20 and 25×25 cm) and nitrogen fertilizer had four levels(0¡ 92¡ 115 and 138 kg N ha-1¡ respectively). Some agronomical traits such as length of panicle¡ number of filled and unfilled grains¡ totalnumber of grains per panicle¡ 1000 grains weight and economic yield were measured.Results showed that Planting spaces and nitrogen levels had significant effects on grain yield and the highest grain yield was obtained from the Planting spaces of20×20 cm and application of 115 kg N ha-1.