Impact of Standardizing Macro-Nutrient (Nitrogen) Requirement in Newly Released Potato (Solanum tuberosum L.) var. Kufri Neelkanth

Present experiment was conducted during the rabi season at the, Department of vegetable science, Chandrashekhar Azad University of Agriculture and Technology, Kanpur. The experiment was carried out under in factorial randomized block design with three replications. The experiment encompassed seven treatments including a control: T1 - Nitrogen 00 kg/ha, T2 - Nitrogen 50 kg/ha, T3 - Nitrogen 100 kg/ha, T4 - Nitrogen 150 kg/ha, T5 - Nitrogen 200 kg/ha, T6 - Nitrogen 250 kg/ha, and T7 - Nitrogen 300 kg/ha, each replicated three times. Various growth characteristics were evaluated, including plant Emergence (%), plant height (cm) at 25, 50, and 75 days after planting, the number of shoots per plant at 75 days after planting, the number of compound leaves per plant at 75 days after planting, the number of tubers of different grades, Total tuber yield, and tuber dry matter content. The results demonstrated that applying nitrogen at a rate of 200 kg/ha (T5) significantly increases the plant emergence (%) viz. 96.61, tuber number of different grades viz. 320 ( 0-25 g), 402 (25-75 g), 297 (>75 g) and total tuber yield viz. 71.49 ( kg/plot) and 372.34 (q/ha), while applying nitrogen at a rate of 300 kg/ha (T7) significantly increases the plant height (cm) at different days DAP viz. 23.28 (25 DAP), 52.32 (50 DAP), 63.93 (75 DAP), No. of shoots and leaves viz. 5.92 and 37.91 at 75 DAP respectively, Fresh and dry haulm yield (kg/plot) viz. 34.46 and 4.89 respectively, while Tuber dry matter content (%) viz. 18.74 was found highest in the contol i.e. T1 having no nitrogen application.