Abstract: 【Objective】To investigate the effects of partial substitution of chemical fertilizers with different types of organic fertilizers on potato yield in the dry farming area of the northern foothills of the Yinshan Mountains in Inner Mongolia,providing a reference for potato cultivation in this region.【Methods】Five treatments were established,application of nitrogen,phosphorus,and potassium fertilizer（NPK）,NPK+liquid fertilizer（NPK+LM）,NPK+granular fertilizer（NPK+GM）,NPK+sheep dung fertilizer（NPK+SM）,and NPK+bio-organic fertilizer（NPK+BM）. The impact of these treatments on potato yield and its components,growth indicators,nutrient uptake of nitrogen,phosphorus and potassium by plants,soil water use efficiency,and nutrient content in the plow layer soil were analyzed.【Results】The NPK+BM treatment resulted in the highest potato yield,commercial tuber yield,number of commercial tubers,individual tuber weight,and commercial tuber rate,which were 30.83 t/hm²,20.34 t/hm²,84 700 tubers/hm²,162.86 g/tuber,and 65.96%,respectively;during the tuber bulking stage,the plant height and leaf area index of potatoes were the highest,at 82.89 cm and 8.06,respectively,showing significant differences compared to the NPK treatment（P<0.05）;at harvest stage,the dry matter accumulation in the stems,leaves,and tubers of potatoes were the highest,at 75.51,67.36,and 145.81 g/plant,respectively;at harvest stage,the highest uptake of nitrogen,phosphorus,and potassium by plants,at 296.83,36.09,and 285.92 kg/hm²,respectively. The NPK+LM treatment had the highest water use efficiency,at 128.95 kg/（hm²·mm）,followed by the NPK+BM treatment,at 113.87 kg/（hm²·mm）. The NPK+BM treatment had the highest soil fast-acting potassium content of 137.33 mg/kg,and higher soil effective phosphorus,alkaline-hydrolyzed nitrogen,and organic matter content of 25.53 mg/kg,88.68 mg/kg,and 22.95 g/kg,respectively.【Conclusion】The NPK+bio-organic fertilizer treatment can effectively promote the growth and development of potatoes,and enhance nutrient uptake efficiency,increase yield,playing a positive role in maintaining soil health. It can be considered a more suitable combination of organic fertilizers to partially replace chemical fertilizers in the dry farming area of the northern foothills of the Yinshan Mountains.

Key words: Potato, Bio-organic fertilizer, Yield, Dry matter accumulation, Soil nutrient content