Effect of nitrogen fertilizer management on growth analysis of rice cultivars.

TLDR: Results indicated that cultivar and nitrogen fertilizer significantly effected on grain yield, and Khazar and Ali Kazemi have the highest grain yield among cultivars.

Abstract: In order to study the effects level of nitrogen fertilizer on yield and physiological traits of rice cultivars (Oryza sativa L.), an experiment as factorial in RCBD with three replications was conducted during 2009 year in the Rice Research Institute, Iran, Rasht, central of Guilan and Rudsar, East of Guilan. Factors were cultivar (Khazar, Ali Kazemi and Hashemi), and nitrogen fertilizer levels (0, 30, 60, and 90 Kg N/ha). Characters measured were: leaf area index (LAI), Total of dry weight (TDW), leaf dry weight (LDW), Crop growth rate (CGR), relative growth rate (RGR), net assimilation rate (NAR), leaf area duration (LAD), leaf area ratio (LAR), leaf weight rate (LWR), specific leaf area (SLA), grain yield. Growth parameters were calculated during six growth stages by harvesting samples from leaf area index, leaf dry and total weight dry weight in all treatments. The comparison of calculated and measured amounts of growth indexes with use determination of regression coefficients (R2). Results of growth analysis indicated that, nitrogen increasing rates of fertilizer caused the increment of growth indexes. Khazar and Ali Kazemi Hashemi showed higher growth indices rather than Hashemi. Results indicated that cultivar and nitrogen fertilizer significantly effected on grain yield. Khazar and Ali Kazemi have the highest grain yield among cultivars. Also, Results indicated with increasing nitrogen fertilizer application, grain yield increased significantly (17،13 and 57 %). * Corresponding Author: Maral Moraditochaee  m.a4444@yahoo.com International Journal of Biosciences | IJB | ISSN: 2220-6655 (Print) 2222-5234 (Online) http://www.innspub.net Vol. 4, No. 5, p. 35-47, 2014