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Effects of earthworm casts on water and salt movement in typical Loess Plateau soils under brackish water irrigation

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  • Li, Yanpei
  • Wang, Jiao
  • Shao, Ming’an

Abstract

Soil salinization severely degrades agricultural land and significantly impacts agricultural productivity. Earthworm casts, as a pollution-free improver, can effectively enhance the structure and properties of soil; however, their effects on water and salt movement in soil, under brackish water irrigation, remain unclear. In this study, we conducted laboratory experiments to investigate the effects of earthworm cast treatments under four application rates (untreated, 1%, 3%, and 5% of soil weight) on water and salt movement in anthrosols (CS) and cambisols (AS) from the Loess Plateau. The application of earthworm casts was found to inhibit soil infiltration and evaporation, except for the 1% treatment in CS; inhibition also increased with more concentrated treatments. Compared to that in untreated soil, the infiltration rate and cumulative evaporation in cast-treated CS decreased by 23.9–32.2% and 5.1–9.8%, whereas in AS, they decreased by 17.6–28.5% and 8.6–20.7%. The application of earthworm casts significantly reduced the electrical conductivity of the upper 20 cm of soil, and the reduction increased with more concentrated treatments. Compared with untreated soil, the application of earthworm casts significantly reduced the sodium absorption ratio in the upper 0–20 cm by 15.6–31.1% in CS and 12.2–28.1% in AS. Applying earthworm casts significantly reduced the exchangeable sodium percentage of soil at 0–20 cm by 16.5–25.9% in CS and 13.5–22.5% in AS. Therefore, the application of earthworm casts effectively alleviated soil salinity and sodicity in both soil types by reducing the salt content in the upper 0–20 cm under brackish water irrigation.

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  • Li, Yanpei & Wang, Jiao & Shao, Ming’an, 2021. "Effects of earthworm casts on water and salt movement in typical Loess Plateau soils under brackish water irrigation," Agricultural Water Management, Elsevier, vol. 252(C).
    • Handle: RePEc:eee:agiwat:v:252:y:2021:i:c:s0378377421001955
    DOI: 10.1016/j.agwat.2021.106930
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    1. Mahmoodabadi, Majid & Yazdanpanah, Najme & Sinobas, Leonor Rodríguez & Pazira, Ebrahim & Neshat, Ali, 2013. "Reclamation of calcareous saline sodic soil with different amendments (I): Redistribution of soluble cations within the soil profile," Agricultural Water Management, Elsevier, vol. 120(C), pages 30-38.
    2. Liu, Bingxia & Wang, Shiqin & Kong, Xiaole & Liu, Xiaojing & Sun, Hongyong, 2019. "Modeling and assessing feasibility of long-term brackish water irrigation in vertically homogeneous and heterogeneous cultivated lowland in the North China Plain," Agricultural Water Management, Elsevier, vol. 211(C), pages 98-110.
    3. Houlbrooke, D.J. & Laurenson, S., 2013. "Effect of sheep and cattle treading damage on soil microporosity and soil water holding capacity," Agricultural Water Management, Elsevier, vol. 121(C), pages 81-84.
    4. Kahlown, Muhammad Akram & Azam, Muhammad, 2003. "Effect of saline drainage effluent on soil health and crop yield," Agricultural Water Management, Elsevier, vol. 62(2), pages 127-138, September.
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    1. Liu, Zihan & Cai, Lu & Dong, Qinge & Zhao, Xiaoli & Han, Jianqiao, 2022. "Effects of microplastics on water infiltration in agricultural soil on the Loess Plateau, China," Agricultural Water Management, Elsevier, vol. 271(C).

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