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ThesisItem Open Access Effect of seed size and plant spacing on seed production of potato cv. Kufri Khyati(CCSHAU, 2019) Anil Kumar; Phor, S.K.The experiment entitled “Effect of seed size and plant spacing on seed potato production cultivar Kufri Khyati.” was conducted at Vegetable Seed Production and Research Farm, KVK Sonipat during winter season of the year 2017-18. The experiment comprising of five seed sizes (15-30 g, 31-60 g, 61-90 g, 91-120 g and 121-150 g) and three plant spacing (60x20, 60x30 and 60x40 cm) was laid out in a random block design with three replications keeping net plot size 4.8x3.6 m. Five competitive plants were selected randomly from each experimental treatment to record data on various parameters, which were influenced significantly by different seed size and plant spacing. The per cent plant emergence, plant height, number of stems per hill, number of leaves per hill, weight of stems, weight of leaves, number of tubers of up to 25 g, weight of tubers up to 25 g, tuber dry matter content were statistically higher with the seed size 121-150 g and the number of tubers >25-50 g grade, weight of tubers >25-50 g, harvest index, percent seed tuber were maximum with the seed size 61-90 g. However, the value for number of tubers >50-75 g and >75 g grade, weight of tubers >50-75 g and >75 g grade and total tuber yield were maximum with the seed size 91-120 g. Different plant spacing exhibited significant difference growth and yield parameters. The maximum value for plant emergence, plant height, number of tubers up to 25 g, >25-50 g, >50-75 g and >75 g grade, weight of tubers up to 25 g, >50-75 g and >75 g grade, tuber dry matter content, percent seed tuber and total tuber yield were maximum with 60x20cm plant spacing. However, number of stems per hill, number of leaves per hill, weight of stems, weight of leaves and harvest index was found maximum with plant spacing 60x40 cm. Significantly highest value was registered for number of stems, number of leaves, weight of stems, weight of leaves, with seed size 121-150 g in combination with spacing of 60x40 cm. Maximum value for number and weight of tubers up to 25 g found with seed size 121-150 g in combination with spacing of 60x40 cm while maximum value for number and weight of tubers >75 g grade, total tuber yield was found with seed size 91-120 g in combination with spacing of 60x20 cm. Significantly maximum value for number of tubers >25-50 g and >50-75 g and weight of tubers >25-50 g and >50-75 g found with seed size 61-90 g in combination with spacing of 60x20 cm. Effect of seed size and plant spacing showed remarkable variation for growth and yield for all the parameters. Kufri Khyati produced highest total tuber yield (358.60 q/ha) when 91-120 g seed tubers were planted at a spacing 60x20 cm which was followed by total tuber yield of 338.61 q/ha with 61-90 g seed size planted at 60x20 cm plant spacing.