Subtropical Plant Science >

2025 , Vol. 54 >Issue 6: 636 - 644

DOI: https://doi.org/10.3969/j.issn.1009-7791.2025.06.005

Research articles

Effects of Water and Nitrogen Regulation under Mulch Drip Irrigation on Potato Yield and Water-Nitrogen Use Efficiency in the Arid Area of Central Gansu

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  • (1. Dingxi City Agricultural Product Quality and Safety Monitoring and Testing Station, Dingxi 743000, Gansu China; 2. Dingxi Academy of Agricultural Sciences, Dingxi 743000, Gansu China; 3. Institute of Soil Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, Gansu China)

Received date: 2025-07-31

  Accepted date: 2025-09-08

  Online published: 2025-12-31

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Abstract

To address the constraints of potato production caused by insufficient rainfall and extensive water-fertilizer management in the arid area of central Gansu, a field experiment was conducted to investigate the effects of coupled water and nitrogen application under drip irrigation on potato growth and resource utilization. The experiment included four irrigation levels (W1, 15 mm; W2, 24 mm; W3, 33 mm; W4, 42 mm) and three nitrogen application rates (N1, 150 kg·hm–2; N2, 210 kg·hm–2; N3, 270 kg·hm–2), forming 12 treatments. The results showed that an increase in irrigation amount was beneficial to the increase of soil water storage, stage water consumption and total water consumption of potatoes. The potato yield increased first and then decreased with the increase of irrigation amount, and increased with the increase of nitrogen application rate. The W3N3 treatment had the highest yield, which was significantly different from other treatments (P<0.05). From the analysis of the commercial potato rate of potatoes, it increased first and then decreased with the increase of irrigation amount, and increased with the increase of nitrogen application rate. The commercial potato rate of the W3N3 treatment reached 86.79%, which was significantly higher than that of other treatments. The W3N3 treatment had the highest yield, commercial potato rate and water use efficiency, but the partial factor productivity of nitrogen fertilizer was relatively low. Based on the comprehensive evaluation of potato yield, commercial potato rate and water and nitrogen use efficiency by the TOPSIS method, considering the local rainfall, water-saving and high-yield production and commercial attributes, it is believed that the optimal drip irrigation quota and nitrogen application rate for potatoes in arid area of central Gansu are 330 mm and 270 kg·hm–2, respectively. This study will provide important theoretical basis and technical guidance for water-saving and high-yield cultivation of potatoes in the arid area of central Gansu Province.

Key words： potato; water and nitrogen regulation; yield; water and nitrogen use efficiency; TOPSIS method

Cite this article

WANG Fang, ZHANG Juan-ning, BAI You-shuai, CHEN Li, KANG Ming-jiao . Effects of Water and Nitrogen Regulation under Mulch Drip Irrigation on Potato Yield and Water-Nitrogen Use Efficiency in the Arid Area of Central Gansu[J]. Subtropical Plant Science, 2025 , 54(6) : 636 -644 . DOI: 10.3969/j.issn.1009-7791.2025.06.005

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