Özet:

A field experiment was carried out during two consecutive years of 2015-16 and 2016-17 at ICAR-Central Potato Research Station, Patna, Bihar. The trial was laid out in randomized block design with four replications having objective to quantity the optimum requirement of nitrogen to potato crop. The range of plant emergence of potato tuber was recorded from 94.3 to 98.0 % during the both the years. Significantly the highest plant height was recorded with nitrogen level of 300 kg/ha. Numbers of shoot per plant of potato were noticed slightly higher with application of nitrogen compare to without nitrogen. Distributions of the smallest size of tuber yield of potato were decreasing with increasing the level of nitrogen. There was about 26.0% more yield of the smallest size tuber of potato was recorded with zero nitrogen as compare to the highest level of nitrogen i.e. 300 kg/ha. Increasing the nitrogen over the level of 150 to 225 kg per hectare, increasing the yield of tuber gradually slower rate than nitrogen level from 0 to 150 kg/ha. Total and marketable tuber yield of potato were increasing significantly with increasing level of nitrogen upto 150 kg/ha. There was no significant difference in marketable tuber yield was found for nitrogen level between 150 and 225 kg/ha. Highest (1.66) net benefit cost ratio was also recorded with level of nitrogen @ 150 kg/ha in potato. Hence, application of nitrogen @ 150 kg/ha was found statistically and economically more beneficial for potato cultivation in Eastern Indo-Gangatic plain of India.

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