Abstract
Spring rice plays important role in ensuring food self-sufficiency by complementing the production of main season rice in Nepal. To assess the optimal level of nitrogen, phosphorous and potassium in spring rice, a field experiment was conducted in Kanchanpur district, during Feb- June 2023. The experiment was laid out in randomized complete block design with three replications and seven treatments viz., (T1), 120:40:40 NPK kg/ha, (T2), 180:40:40 NPK kg/ha, (T3), 60:40:40 NPK kg/ha, (T4), 120:60:40 NPK kg/ha, (T5), 120:20:40 NPK kg/ha, (T6), 120:40:60 NPK kg/ha and (T7), 120:40:20 NPK kg/ha. Hardinath-1 variety of rice was transplanted at spacing of 20 cm × 15 cm in all the plots. Data for growth parameters, yield attributes, and yield were collected and analyzed. Analysis of variance for all the parameters was done and treatments were compared at 5% level of significance. The statistical analysis revealed that the treatment T2, 180:40:40 NPK kg/ha was statistically superior in terms of yielding plant height, effective tillers, panicle length, grain yield and straw yield (P< 0.05). An increase of 20.52%, 30.19% and 50.68% was observed in number of effective tillers, grain yield and straw yield respectively in T2 over the recommended dose of government i.e. T1 (120:40:40 NPK kg/ha). Similarly, T2; 180:40:40 NPK kg/ha, where nitrogen level was increased by 50 % on government recommendation, provided highest gross return, net return and the benefit cost ratio of 2.35. Therefore, the fertilizer dose 180:40:40 NPK kg/ha is suggested for better productivity of spring rice in Kanchanpur, Nepal.
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