Evaluation of Nitrogen and Silicon application on Lodging Traits, Agronomical Indices, Chemical Traits and Grain Yield in Rice

The experiment was carried out in split plot in basis of randomized complete block design with three replications at north of Iran in 2010. Main plot was nitrogen rates including (0, 50, 100 and 150 kg N ha-1) applied as urea and sub plot was silicon rates (0, 300 and 600 kg Si ha-1) applied as silicate. Results showed the least of the plant height, fourth internode bending moment, hollow spikelet, panicle per m2, grain yield (4350 kg.ha-1) and harvest index were obtained at N0, as well as most of the panicle length, panicle per m2, spikelet number, grain yield (6063 kg.ha-1) and harvest index were observed at N150. Si600 in comparison Si0 were significantly decreased hollow spikelet number. As well as, S600 increased plant height, panicle length, third internode bending moment, total tiller and fertile tiller number, spikelet number, filled spikelet percentage, cellulose, hemicellulose and lignin 7.8, 30.2, 18.7, 14.1, 15.6, 11.9, 12.4, 7.6, 34.5 and 26.3 % relation to, respectively. Therefore, N150 and Si600 treatment was cause of the most of desirable agronomical indices and due to high grain yield.

Bending moment, Chemical traits, Grain yield, Nitrogen, Rice, Silicon.