A field experiment was conducted to investigate the effect of nitrogen (N) fertilizer on growth, development and yield of Upland, IRHTN, DRR and other released rice groups. Six varieties from each group, a total of 18 genotypes were planted in randomized complete block design during dry (2011) and wet (2012) seasons with three replications at Indian Institute of Rice Research, Hyderabad. Group responses to the N-stress (N0; native nitrogen) and recommended nitrogen (N100; 100 kg N ha-1) for physiological, morphological and yield attributes were recorded. The average leaf rolling time was found 75.4% increased with N-100 in IRHTN group over N-0 in the same group and also found higher among the groups. Leaf temperature, SPAD was noticed higher in DRR and other released group with N-100. The highest plant height was observed in Upland group only, while number of tillers, effective booting tillers (EBT), filled grain weight and total dry matter (TDM), harvest index (HI), total nitrogen content (straw + grain) were found increased with N-100 in DRR and other released group.
Key words: Leaf rolling, nitrogen, rice, SPAD, grain yield.
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