Effect of Nitrogen and Phosphorus Fertilizer on spikelet Structure and yield in rice(oryza sativa L).

ABSTRACT: In order to investigate the effect of nitrogen and phosphorus fertilizer on spikelet Structure and yield in rice(oryza sativa), an experimental design in north of iran in 2011 cropping season. Nitrogen fertilizer at 50,100 and 150 kg/ha was main plot and phosphorus fertilizer at 4 level 0(control), 30, 60 and 90kg/ha as sub plot. Using randomized complete block desing(RCBD) with 3 replication. The results showed that spikelet number, fertile spikelet , fertile spikelet percentage(%), Spikelet sterility percentage(%), biological and grain yield increased significantly with nitrogen and phosphorus fertilizer. Interesting in comparison to 50 and 100 kg/ha level application of higher N-fertilizer 150 kg/ha showed a positive respond to application of high nitrogen for taroom hashemi cultivar. Effect of different application of P-fertilizer were significantly on this parameter, increase application of phosphorus increase parameter above. The interaction effect of nitrogen and phosphorus fertilizer no significant effect in other parameter.