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ThesisItem Open Access Effect of irrigation and potash levels on yield and keeping quality of potato (Solanum tuberosum L.)(CCSHAU, 2012) Adhikari, Ram Chandra; Rana, M.K.The experiment entitled “Effect of irrigation and potash levels on yield and keeping quality of potato (Solanum tuberosum L.)”was conducted at Research Farm of the Department of Vegetable Science, CCS Haryana Agricultural University, Hisar during winter season of 2010-11 and 2011-12 to find out the optimum level of irrigation and potash for getting higher yield as well as keeping quality of potato tubers at ambient room temperature. The potato variety used for the investigation was Kufri Bahar. The treatments comprising four levels of irrigation (25, 30, 35 and 40 mm CPE) and four levels of potash (0, 100, 125 and 150 kg/ha) were laid out in a split plot design with three replications keeping a net plot size of 3.6x3.6 m. The ten competitive plants were selected randomly from each treatment to record data on various parameters, which were influenced significantly by different levels of irrigation and potash. The leaves weight per hill (g), leaf area index, weight (kg) of >25-50, >50-75 and > 75 g size tubers,total tuber yield (kg/m 2 and q/ha) and marketable tuber yield (kg/m 2 and q/ha) were registered significantly maximum with irrigation level 35 mm CPE. Likewise, the values for physiological loss in weight and decay loss of potato tubers (%) at 15, 30, 45 and 60 days after harvest was lowest with irrigation level 40 mm CPE. The maximum value for plant height at 45, 60, 75 and 90 days after planting, number of stems per hill, number of leaves per stem, leaves weight per hill (g), stem weight per hill (g), leaf area index, number and weight (kg) of >25-50, 50-75 and >75 g size tubers, total number and weight of tubers (kg) per meter square and total and marketable tuber yield (kg/m 2 and q/ha) were recorded maximum with the application of potash @ 150 kg/ha. However, the number and weight (kg) of up to 25 g size tubers was noticed maximum with no potash application. Dry matter and starch content of potato tubers (%) at harvest was recorded maximum with potash application @ 150 kg/ha, while the total ethanol soluble sugars content of potato tubers at harvest on dry weight basis (mg/100 g) was minimum with potash 150 kg/ha. The minimum value for physiological loss in weight and decay loss of potato tubers (%) at 15, 30, 45 and 60 days after harvest was recorded with potash application @ 150 kg/ha. The interaction effect of irrigation and potash levels showed remarkable variation for leaves weight, leaf area index, tuber yield and keeping quality parameters. Significantly the highest values for leaves weight per hill (g), leaf area index, weight (kg) of >25-50, 50-75 and >75 g size tubers per square meter, total weight of tubers (kg) per square meter were registered with the treatment combination of irrigation level 35 mm CPE andpotash 150 kg/ha. Similarly, significantly the minimum value for physiological loss in weight and decay loss of potato tubers (%) at 15, 30, 45 and days after harvest wasnoted with treatment combination of irrigation level 40 mm CPE and potash application @ 150 kg/ha. The two years results suggest that the irrigation level 35 mm CPE in combination with potash @ 150 kg/ha and irrigation level 40 mm CPE with potash 150 kg/ha have shown the best treatment combinations for potato production and storage at ambient room temperature, respectively under semiarid conditions of Hisar (Haryna).