Background and Objective: The G 0 ʻMedianʼ potato was designed to adapt in medium-altitude land and to produce seed tuber instead of food material. This study aimed to evaluate the growth and production of G 0 ʻMedianʼ potato under different media composition and fertilizer application methods in medium-altitude land. Materials and Methods: Two weeks old post acclimatization plantlet of G 0 ʻMedianʼ potato was prepared as plant material and then arranged in a split-plot design with two factors (growing media and chemical fertilizer application method) and three replications. Results: The result showed that the less proportion of soil in growing media could improve the field capacity, porosity, air space and water holding capacity, resulting in more loose structures suitable for potatoes (GM 1 >GM 2 >GM 3 ). The interaction of GM 1 +F 2 produced the significantly heaviest plant biomass (dry weight of plant and root). However, the best treatment was GM 2 +F 2 with the highest number of tuber per plant, i.e., 6 tuber per plant. Conclusion: High frequency (10x) of diluted granular fertilizer by using watering method (F 2 ) was suitable to improve not only the number of stolon and tuber but also the quality of harvested tuber as indicated by the lower percentage of small seed tuber.

Background and Objective: The use of pruning, nitrogen and cytokinin application to regulate plant growth and yield. The induction of stolon in potato plants is aimed to increase the number of tubers. The present study aimed to evaluate the effect of pruning, cytokinin and nitrogen application on stolon induction, growth and yield of G0 potato tuber (Solanum tuberosum L.) cv. Median in the medium-altitude land. Materials and Methods: This study was carried out at the screenhouse of Rancabango village, Tarogong Kaler Subdistrict, Garut District, West Java Province, Indonesia (700 m above sea levels). This study is arranged in split-plot design, with 2 factors, 12 combination treatments and 3 replications. The 1st factor was the pruning (P) consisted of 3 levels, i.e., no pruning (P0), pruned at 20 DAP (P1), pruned at 30 DAP (P2). The 2nd factor was the cytokinin and nitrogen application (H) that consisted of 4 levels, i.e., control (H0), 50 ppm cytokinin (H1), 100% nitrogen ZA (H2), 50 ppm cytokinin+100% nitrogen ZA (H3). Results: The results showed that there was an interaction effect between pruning, nitrogen and cytokinin on growth variables, such as leaf area, stomatal conductance, photosynthetic rate and production variables, such as number of stolons, percentage of stolons, number of tubers per plant, tuber weight per plant and plant dry weight. Conclusion: Pruning at 30 DAP combined with cytokinin and nitrogen application produced the best result, for about 9.33 tubers per plant.