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Background and aims <p>Drought and soil erosion constrain alfalfa (<i>Medicago sativa</i> L.) production in semiarid regions. A three-year field experiment was conducted to determine suitable ridge width and straw length for alfalfa production in ridge-furrow rainwater harvesting (RFRH) under rainfed conditions.</p> Methods <p>The experiment adopted a randomized block design with ten treatments. Treatments consisted of three ridge widths (30, 45, and 60&#xa0;cm), three mulching materials (ridges compacted with soil crust (RCS), short-chopped straw-soil crust (SCS), and long-chopped straw-soil crust (LCS)), and flat planting (FP) as control.</p> Results <p>RFRH compacted with soil crust, especially with chopped straw-soil crust, increased runoff, soil moisture, alfalfa fodder yield, quality, and water use efficiency (WUE), while decreased soil temperature. Runoff coefficients for the ridge widths of 30, 45, and 60&#xa0;cm were 23%, 25%, and 28%, respectively, while for RCS, SCS, and LCS were 21%, 25%, and 30%. Compared to FP, RFRH compacted with soil crust increased soil water storage, fodder yield, crude protein, and WUE by 14.3 to 60.8&#xa0;mm, 6% to 37%, 6.9 to 46.8&#xa0;g&#xa0;kg<sup>−1</sup>, and 1.1 to 11.8&#xa0;kg&#xa0;ha<sup>−1</sup>&#xa0;mm<sup>−1</sup>, respectively, and decreased soil temperature by 0.5&#xa0;°C to 1.5&#xa0;°C. Structural equation modelling indicated a significant direct effect of ridge width (standardized path coefficients 0.39***) and straw length (standardized path coefficients 0.24**) on fodder yield.</p> Conclusions <p>In RFRH, a ridge width of 60&#xa0;cm combined with a straw mulch length of 10&#xa0;cm optimized soil hydrothermal conditions for alfalfa production, providing a sustainable alternative to plastic film mulching.</p>

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Suitable ridge width and straw length for alfalfa production under ridge-furrow rainwater harvesting compacted with chopped straw-soil crust in semiarid regions

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Rizwan Azim,
  • Qi Wang,
  • Xuchun Li,
  • Abdul Qadeer,
  • Xiaole Zhao,
  • Ibrahim Awuku,
  • Wen Ma,
  • Qinglin Liu,
  • Yanping Liu,
  • Bing Liu

摘要

Background and aims

Drought and soil erosion constrain alfalfa (Medicago sativa L.) production in semiarid regions. A three-year field experiment was conducted to determine suitable ridge width and straw length for alfalfa production in ridge-furrow rainwater harvesting (RFRH) under rainfed conditions.

Methods

The experiment adopted a randomized block design with ten treatments. Treatments consisted of three ridge widths (30, 45, and 60 cm), three mulching materials (ridges compacted with soil crust (RCS), short-chopped straw-soil crust (SCS), and long-chopped straw-soil crust (LCS)), and flat planting (FP) as control.

Results

RFRH compacted with soil crust, especially with chopped straw-soil crust, increased runoff, soil moisture, alfalfa fodder yield, quality, and water use efficiency (WUE), while decreased soil temperature. Runoff coefficients for the ridge widths of 30, 45, and 60 cm were 23%, 25%, and 28%, respectively, while for RCS, SCS, and LCS were 21%, 25%, and 30%. Compared to FP, RFRH compacted with soil crust increased soil water storage, fodder yield, crude protein, and WUE by 14.3 to 60.8 mm, 6% to 37%, 6.9 to 46.8 g kg−1, and 1.1 to 11.8 kg ha−1 mm−1, respectively, and decreased soil temperature by 0.5 °C to 1.5 °C. Structural equation modelling indicated a significant direct effect of ridge width (standardized path coefficients 0.39***) and straw length (standardized path coefficients 0.24**) on fodder yield.

Conclusions

In RFRH, a ridge width of 60 cm combined with a straw mulch length of 10 cm optimized soil hydrothermal conditions for alfalfa production, providing a sustainable alternative to plastic film mulching.