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<p>A field experiment was conducted at Punjab Agricultural University, Ludhiana during 2022–2023 and 2023–2024 to evaluate the effects of drip irrigation method, nitrogen fertigation, and mulching on water-use efficiency and yield of potato. The study compared surface drip irrigation (SDI) and subsurface drip irrigation (SSDI) under eight fertigation mulching combinations in a randomized block design, with conventional practice (CP) as a control. Surface drip irrigation outperformed SSDI due to the shallow rooting pattern of potato and the fixed burial depth (20&#xa0;cm) of SSDI laterals, which restricted upward capillary movement of water in sandy loam soil and reduced early-season moisture availability. Among treatments, T1 (100% crop evapotranspiration, ETc + 100% nitrogen + mulch) produced the highest tuber yield (28.7—31.1 t ha⁻<sup>1</sup>) and water productivity and was statistically comparable to T5 (100% ETc + 70% nitrogen + mulch), demonstrating that a 30% nitrogen saving is achievable under mulching without yield loss. Mulched treatments also enhanced soil moisture conservation, nutrient uptake, and water productivity, particularly under deficit irrigation (70% ETc). Overall, the integration of surface drip irrigation with mulching and fertigation improved potato productivity and resource-use efficiency, highlighting its suitability for water- and nitrogen-limited production systems.</p>

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Productivity and Resource Use Efficiency of Potato under Nitrogen Fertigation through Subsurface Drip Irrigation with Mulching

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Ankita Sharma,
  • MS Kahlon,
  • Madhu Dhingra,
  • Jeevanjot Dhaliwal

摘要

A field experiment was conducted at Punjab Agricultural University, Ludhiana during 2022–2023 and 2023–2024 to evaluate the effects of drip irrigation method, nitrogen fertigation, and mulching on water-use efficiency and yield of potato. The study compared surface drip irrigation (SDI) and subsurface drip irrigation (SSDI) under eight fertigation mulching combinations in a randomized block design, with conventional practice (CP) as a control. Surface drip irrigation outperformed SSDI due to the shallow rooting pattern of potato and the fixed burial depth (20 cm) of SSDI laterals, which restricted upward capillary movement of water in sandy loam soil and reduced early-season moisture availability. Among treatments, T1 (100% crop evapotranspiration, ETc + 100% nitrogen + mulch) produced the highest tuber yield (28.7—31.1 t ha⁻1) and water productivity and was statistically comparable to T5 (100% ETc + 70% nitrogen + mulch), demonstrating that a 30% nitrogen saving is achievable under mulching without yield loss. Mulched treatments also enhanced soil moisture conservation, nutrient uptake, and water productivity, particularly under deficit irrigation (70% ETc). Overall, the integration of surface drip irrigation with mulching and fertigation improved potato productivity and resource-use efficiency, highlighting its suitability for water- and nitrogen-limited production systems.