Genotypic variation in growth parameters of traditional rice cultivars under nitrogen limiting condition

Abstract

Abstract : "lants with application of nitrogen (80 kg ha'1) produced the highest leaf area i idex (LAI) of 4.23 followed by that of 10 t ha-1 cowdung (4.12), while zero nitrogen resulted considerably in low LAI (3.70) at 65 days after transplanting ;DAT). Traditional cultivar Barud produced the highest LAI (4.90) followed by Basfulchikon (4.18).Crop growth rate (CGR) with added nitrogen was better, irrespective of traditional cultivars. CGR increased sharply after transplanting and reached at the peak between 55 to 65 DAT. Barud, the long duration traditional cultivar, showed the highest CGR (24.59 g g ''day1). Badiruzzman, Golapi, Malanchi and Barud maintained a higher average CGR value of 13.58 to 15.73 g g''day' during 15 to 85 DAT, while Basfulchikon was the intermediate (13.41 g g ''day*1). On the contrary, Laichi, Kamerga chikon and Tulshimala performed in lesser magnitude. The highest total dry matter (TDM) was observed in N (80 kg ha*') treatment followed by cowdung treatment, while plant with zero nitrogen produced considerably low TDM at 85 DAT. Barud produced the highest TDM, which was markedly over rated from 55 DAT and continued up to the end. Laichi and Tulshimala were ranked the lowest for TDM production. All the traditional cultivars showed almost identical trend of TDM over time under variable nutrient levels.