The field experiments were conducted during two consecutive rabi seasons (October – February) during 2019–20 and 2020–21 at ICAR-Central Potato Research Institute Regional Station, Gwalior, Madhya Pradesh, India located in west central plains of India. Highest emergence of potato plants was recorded with the planting of 40 g whole tubers. Growth attributes viz. plant height (58.6 cm) and number of compound leaves (56.7) were recorded highest with 40 g seed piece/whole tuber. Planting of 120 g seed tubers, 10 cm intra row spacing and 114 days haulm cut recorded highest number of small tubers i.e. 3,43,000 ha-1, 3,07,000 ha-1 and 3,26,000 ha-1, respectively. Highest total number of tubers was recorded at 114 DAP haulm cut (9,08,000 ha-1), planting of 120 g seed tubers (9,62,000 ha-1) and 10 cm intra row spacing (8,53,000 ha-1). Highest total tuber yield was recorded with 114 DAP haulm cut (59.1 t ha-1), 120 g planted seed tubers (55.5 t ha-1) and 20 cm intra row spacing (49.7 t ha-1). Highest cost of cultivation was recorded with the use of 120 g seed (Rs. 386483 ha-1) and intra row spacing of 10 cm ` 264261 ha-1. Highest net return (Rs. 364084 ha-1) was recorded with 114 DAP haulm cut, planting with 40g seed size tubers (` 329822 ha-1) and intra row spacing of 20 cm (Rs. 322499 ha-1). Highest benefit-cost ratio was recorded with 114 DAP haulm cut (2.6) planting with 20 g seed size tubers (3.3) and intra row spacing of 20 cm (2.8).
Potato (Solanum tuberosum L.) varieties, viz. Kufri Lauvkar (early maturing), Kufri Gaurav and Kufri Jyoti (medium maturing) were examined during the years 2018–19 and 2019–20 for the seed size tubers production with 3 dates of haulm killing, viz. 70, 80, and 90 days after planting under West-Central Indian conditions at ICAR-Central Potato Research Institute, Regional Station Gwalior, Madhya Pradesh. Haulm killing at 80 (15.05 t/ha) and 90 days (14.60 t/ha) noticed significantly greater seed size tubers weight over 70 days' haulm killing (12.13 t/ha). Kufri Gaurav recorded substantially greater number of seed size tuber (288 t/ha) and weight (15.76 t/ha) than the other two varieties. Eighty days haulm killing was observed to be the best seed significantly: non-seed ratio (1.088 by numberand 0.659 by weight) followed by 70 days (1.140 by number and 0.734 by weight) over the poorest 90 days haulm killing (1.121 by number and 0.946 by weight). Therefore, for achieving high seed-size potato tubers, haulm cutting should be done at 80 DAP.
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