In 2017, we examined the effect of different planting methods (flat and ridge planting) on the yield of the sweet potato variety Ásotthalmi 12 under different ecological conditions (Deszk = heavy alluvial soil, Debrecen = mid-heavy adobe soil). The production region determined the yield level of sweet potato. In the experiment of favourable soil endowments, the tuber yield of Ásotthalmi 12 ranged between 23.233–32.200 t ha-1, while in the less favourable experiment with the heavier soil in Deszk, the obtained yield ranged between 16.482–22.056 t ha-1, depending on the given planting method and fertiliser dose. The applied planting method had a reverse effect at the experiment site. In Debrecen, significantly higher yield was obtained (32.200 t ha-1) in the case of flat planting than ridge planting (23.233 t ha-1). On the contrary, yield obtained from ridge planting in the Deszk experiment (18.286–22.056 t ha-1, depending on the given fertiliser dose) was significantly higher than in the case of ridge planting (16.482–18.257 t ha-1).

Keywords: sweet potato, planting method, small plot experiment, ridge, Ásotthalmi-12