Effect of split application of nitrogen on growth, yield and quality of Potato (Solanum tuberosum L.)
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Date
2020-12
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present investigation was undertaken to evaluate the “Effect of split applications of nitrogen on growth, yield and quality of Potato (Solanum tuberosum L.)” at Vegetable Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) during rabi season of 2018-2019. The experiment was laid out in Randomized Block Design consisting of seven treatments with three replications. During the study, observations on per cent emergence at 30 DAP, plant height, number of haulms per hill and haulm diameter at 30, 45 and 60 days after planting (DAP), grade wise number and weight of tubers per plot and total number of tubers with weight of tubers per hectare, harvest index, dry matter content, protein content and specific gravity of tubers, available nitrogen in soil before planting and after harvesting, nitrogen content and nitrogen uptake by haulms, tubers and whole plant, nitrogen use efficiency and nitrogen apparent recovery was also recorded. Besides this, to assess the profitability of treatments, cost of cultivation, net profit and benefit: cost ratio were also worked out. The findings of present investigation revealed that performance of potato crop was significantly influenced by split application of nitrogen. Among all the treatments, 50% N of RDF as basal + 25% top dressing at 25 DAP + two foliar spray @2% urea at 40 & 55 DAP (T6) was found best with respect to overall plant growth, yield and quality parameters with a total yield (38.67 t ha-1), net profit (` 142677 ha-1) and benefit cost ratio (1.86). Based on overall performance, it could be concluded that under prevalent climatic conditions of Uttarakhand tarai region, 50% N of RDF as basal + 25% top dressing at 25 DAP + two foliar spray @2% urea at 40 & 55 DAP found best in terms of higher yield and economic return in potato. Hence, the same is recommended for commercial cultivation of potato under tarai condition of Uttarakhand, if provided all other scientific management practices are followed.