Low soil moisture content and soil fertility are the major problems constraining productivity of potato (Solanum tuberosum L.) in the eastern highlands of Ethiopia. Therefore, a field experiment was conducted to investigate the effect of drip irrigation regimes and fertilizer rates on tuber yield, as well as nitrogen, phosphorus, and water use efficiencies of potato during the off-season of 2019/2020. The experiment was laid out as a split-plot design with three replications. Three levels of irrigation regimes, viz. 50%, 75% and 100% (full) of ETc were assigned to the main plots. Seven rates of fertilizer [control; 65 kg N + 242 kg NPS ha⁻¹(recommended rate); 50% of the recommended N + 75% of the recommended NPS along with 10 ton FYM ha⁻¹; 75% of the recommended N + 50% of the recommended NPS along with 10 ton FYM ha⁻¹; 75% of the recommended rate of N and NPS along with 5 ton FYM ha⁻¹; 75% of the recommended rate of N and NPS along with 10 ton FYM ha⁻¹ and 111 kg N + 92 kg P2O5 ha⁻¹] were assigned to the sub-plots. The results indicated that the optimum total tuber yield (48.38-ton ha⁻¹) and marketable tuber yield (47.80 ton ha⁻¹) were obtained in response to the application of 75% of the recommended rate of N and NPS along with 5 ton FYM ha⁻¹ together with 75% ETc. These total and marketable tuber yields exceeded the total and marketable tuber yield obtained in response to 50% ETc together with no fertilizer application by about four-fold. The above-mentioned treatment combination also resulted in the optimum agronomic nitrogen and phosphorus use efficiencies. Water use efficiency was improved by 3 kg m⁻³ in response to the application of 75% of the recommended rates of N and NPS along with 5-ton FYM ha⁻¹ together with 50% ETc compared to the same rate of the fertilizer treatment combined with 100% ETc. It is concluded that application of 75% ETc combined with 75% of the recommended rate of N and NPS along with 10 ton FYM ha⁻¹ increased potato yield, water productivity and N and P use efficiencies in Haramaya district.

土壤含水量低、土壤肥力低是制约埃塞俄比亚东部高地马铃薯（ Solanum tuberosum L.）生产力的主要问题。因此，通过田间试验，研究滴灌制度和施肥量对2019/2020年淡季马铃薯块茎产量以及氮、磷和水分利用效率的影响。该实验采用裂区设计，重复三次。三个级别的灌溉制度，即。50%、75% 和 100%（全部）的 ETc 被分配给主地块。七施肥率【对照；65 kg N + 242 kg NPS ha ⁻¹（建议比率）；推荐 N 的 50% + 推荐 NPS 的 75% 以及 10 吨 FYM ha ⁻¹；推荐 N 的 75% + 推荐 NPS 的 50% 以及 10 吨 FYM ha ⁻¹；N 和 NPS 推荐用量的 75% 以及 5 吨 FYM ha ⁻¹；推荐施用量的 75% 和 NPS 以及 10 吨 FYM ha ⁻¹和 111 kg N + 92 kg P2O5 ha ⁻¹ ] 被分配给子地块。结果表明，施用75%推荐施用量的氮肥和NPS，并施用5吨肥料，可获得最佳块茎总产量（48.38吨ha ^-1）和商品块茎产量（47.80吨ha ^-1 ）。 FYM ha ^-1与 75% ETc 一起。这些块茎总产量和可销售块茎产量超过了响应 50% ETc 且不施肥时获得的总块茎产量和可销售块茎产量的约四倍。上述处理组合还产生了最佳的氮肥和磷肥农艺利用率。与相同施肥量相比，施用建议用量的 75% N 和 NPS 以及 5 吨 FYM ha ⁻¹和 50% ETc 后，水分利用效率提高了 3 kg m ⁻³与 100% ETc 结合。结论是，施用 75% ETc 与 75% 推荐施用量的 N 和 NPS 以及 10 吨 FYM ha ⁻¹一起，提高了 Haramaya 地区的马铃薯产量、水分生产率以及 N 和 P 的利用效率。