Interaction of nitrogen doses and establishment methods in lowland rice at Parwanipur, Bara, Nepal

Abstract

The experiment was laid out in split plot design: three establishment methods were designed (Puddled transplanted rice, Non- puddled transplanted rice, Conventional dry tillage +DSR) as a main plot and four levels of nitrogen rate (0, 60, 120, 180) as sub plot and replicated three times during summer season of 2015 and 2016 at RARS, Parwanipur. Grain yield and other yield attributes like plant height, penicle length and number of tiller per m² of rice was observed significantly differed (p<0.05) between different establishment methods and nitrogen levels. In 2015 there was not significant effect of establishment practices on grain yield but significantly highest grain yield (4603 kg/ha) was obtained from application of nitrogen@120 kg/ha and grain yield decreased with increased of nitrogen application @ 180 kg/ha (4365 kg/ha). Results reveled that significantly higher grain yield was obtained under non puddled transplanted rice (3314 kg/ha) than puddle transplanted rice (3280 kg/ha) which were at par with conventional tillage plus DSR (2123 kg/ha) and significantly highest grain yield (3424 kg/ha) was obtained from application of nitrogen@180 kg/ha during 2016. In both years the highest grain yield was obtained from puddled transplanted rice with the nitrogen application @ 120 kg/ha. Based on two years results, it can be concluded that N is limiting factor for the productivity of rice in Parwanipur. Therefore 120 kg/ha nitrogen could be optimum dose for puddled transplanting and direct seeded rice at Parwanipur condition.