Effect Nitrogen Management on fertility Percentage in Rice (oryza sativa L.)

Nitrogen is the most important and the most limiting element in rice growth.This experiment was carried out in randomized complete block desing with 3 replication. Main polt was nitrogen rates including(100,200 and 300kgN/ha) applied as urea and sub plot was split application at three levelT1(1/2 basel-1/2 mid tillering), T2(1/3 basel-1/3 mid tillering-1/3 panicle initiation) and T3 (1/4 basel-1/4 mid tillering-1/4 panicle initiation-1/4 flowering).The analysis of variance showed that the different rate and split application of nitrogen fertilizer on total tiller, fertile tiller, fertile tiller percentage(%), bearin tiller percentage(%), total spikelet, fertile spikelet, fertile spikelet percentage(%), spikelet sterility percentage(%), 1000-grain weight and grain yeild were significant in different probability level. Results showed that maximum of this parameter was observed for 300 kg/ha nitrogen fertilizer except the fertile tiller precentage(%),bearin tiller percentage(%) and spikelet sterility percentage(%). also split application N-fertilizer increased the fertile spikelet percentage (%), fertile spikelet, fertile spikelet percentage(%),1000-grain weight and grain yeild but decresed in the total tiller, bearing tiller percentage% and spikelet sterility percentage(%). Nitrogen managemet (different rate and timing split) is important in improving the fertility percentage that productive high grain yield with the balance between crop N demand and applied fertilizer.