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<p>During two seasons (2021 and 2022), field experiments were conducted at the Demo Farm, Faculty of Agriculture, Fayoum University. The treatments include three irrigation regimes that were used in the study: full irrigation (FI), which had 100% crop evapotranspiration (ETc); two regulated deficit irrigations (I80 and I60), which had 80% and 60% of the ETc, respectively; two irrigation techniques (partial root-zone drying (PRD), and single lateral (SL)), and three buried depth laterals (surface drip irrigation (DI), and subsurface drip irrigation (SDI) with depths of 15 and 30 cm). Results indicated that the larger category of tubers was 30–60 mm. At size 30–60 mm, the highest values of tuber yield, real density, and net profit were 31.94 t/ha, 1.087 g/cm<sup>3</sup>, and 282,725 L.E. ha<sup>−1</sup>, respectively, and they were recorded at FI under PRD and buried depth of 15 cm. The maximum water productivity (WP) value was 15.62 kg m<sup>−3</sup>, recorded with irrigation treatment I60, using PRD under SDI at a buried depth of 15 cm. When irrigation water applied (IWA) decreased by 20% and 40%, the potato yield decreased by 11.04% and 29.88%, respectively. Therefore, it is recommended to use the FI, PRD, and SDI with buried depths of 15 cm to achieve the highly significant yield and net profit when irrigation water is abundant. I80, PRD, and subsurface drip irrigation with a buried lateral depth of 15 cm can be used when water supplies are limited. This approach will save 20%&#xa0;of the IWA while only slightly reducing potato crop productivity.</p>

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Partial Root-Zone Drying and Regulated Deficit Irrigation Effects on Potato Yield, Quality, Water Productivity, and Net Profit under Surface vs. Subsurface Drip Irrigation

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Mohamed H. Abd El-Wahed,
  • Mahmoud M. Ali,
  • Ahmed A. Abdel-Aziz,
  • Yahia A. M. Ibrahim

摘要

During two seasons (2021 and 2022), field experiments were conducted at the Demo Farm, Faculty of Agriculture, Fayoum University. The treatments include three irrigation regimes that were used in the study: full irrigation (FI), which had 100% crop evapotranspiration (ETc); two regulated deficit irrigations (I80 and I60), which had 80% and 60% of the ETc, respectively; two irrigation techniques (partial root-zone drying (PRD), and single lateral (SL)), and three buried depth laterals (surface drip irrigation (DI), and subsurface drip irrigation (SDI) with depths of 15 and 30 cm). Results indicated that the larger category of tubers was 30–60 mm. At size 30–60 mm, the highest values of tuber yield, real density, and net profit were 31.94 t/ha, 1.087 g/cm3, and 282,725 L.E. ha−1, respectively, and they were recorded at FI under PRD and buried depth of 15 cm. The maximum water productivity (WP) value was 15.62 kg m−3, recorded with irrigation treatment I60, using PRD under SDI at a buried depth of 15 cm. When irrigation water applied (IWA) decreased by 20% and 40%, the potato yield decreased by 11.04% and 29.88%, respectively. Therefore, it is recommended to use the FI, PRD, and SDI with buried depths of 15 cm to achieve the highly significant yield and net profit when irrigation water is abundant. I80, PRD, and subsurface drip irrigation with a buried lateral depth of 15 cm can be used when water supplies are limited. This approach will save 20% of the IWA while only slightly reducing potato crop productivity.