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Phytodesalinization of irrigated saline Vertisols in the Niger Valley by Echinochloa stagnina

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  • Ado, Maman Nassirou
  • Guero, Yadji
  • Michot, Didier
  • Soubeiga, Boubacar
  • Senga Kiesse, Tristan
  • Walter, Christian

Abstract

Phytodesalinization by salt-tolerant plants or halophytes has been developed as an alternative way to reclaim salt-affected soils. This study tested the use of Echinochloa stagnina Retz. Beauv. to increase salt removal from saline Vertisols and compared the desalinization potential of two cropping techniques of this fodder crop to those of two other treatments. The study, conducted over 8 months in 100m2 experimental plots within an irrigated perimeter located in Kollo (Niger), tested four treatments: (i) bare soil without crops, considered as a control (PT); (ii) soil cultivated with rice (Oriza sativa L.) (PR) in two successive cropping seasons; (iii) soil cultivated with seasonal E. stagnina in two successive seasons (PEs) separated by a total harvest and (iv) soil permanently cultivated with E. stagnina (PEp) with a staggered harvest during the experimentation period. The experiment was conducted during two cropping seasons with regular irrigation in all plots to maintain water ponding at the surface. Soil salinity was monitored at the start and the end of each cropping season. Compared to the initial state, salt stock in the topsoil (0–0.1m) decreased after two cropping seasons by 72%, 81%, 65% and 38% respectively for PEp, PEs, PR and PT treatments. Considering the 0–0.4m layer, salt stock decreased by 29%, 40%, and 10% respectively for PEp, PEs and PT but increased by 3% for PR. Thus, desalinization was greater in treatments with E. stagnina than in the control or the rice treatment. Moreover, soil bulk density, measured under water-saturated conditions, decreased over time and was lower in soil cultivated with E. stagnina (1.29–1.40Mgm−3) than in bare soil without crops (1.41–1.56Mgm‐3). In addition, forage production of 24–27tha−1 of dry weight biomass after 8 months of growth was sufficiently high to have an economic interest for farmers. Phytodesalinization by E. stagnina appears to be an alternative method to restore saline clay soil that appears effective, beneficial for crop production and of low cost. Nevertheless, further work must be performed to assess effects of E. stagnina roots on hydro-structural properties of Vertisols and the risk of additional salinization after treatment.

Suggested Citation

  • Ado, Maman Nassirou & Guero, Yadji & Michot, Didier & Soubeiga, Boubacar & Senga Kiesse, Tristan & Walter, Christian, 2016. "Phytodesalinization of irrigated saline Vertisols in the Niger Valley by Echinochloa stagnina," Agricultural Water Management, Elsevier, vol. 177(C), pages 229-240.
    • Handle: RePEc:eee:agiwat:v:177:y:2016:i:c:p:229-240
    DOI: 10.1016/j.agwat.2016.07.024
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    References listed on IDEAS

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    1. Adam, I. & Michot, D. & Guero, Y. & Soubega, B. & Moussa, I. & Dutin, G. & Walter, C., 2012. "Detecting soil salinity changes in irrigated Vertisols by electrical resistivity prospection during a desalinisation experiment," Agricultural Water Management, Elsevier, vol. 109(C), pages 1-10.
    2. Armstrong, A. S. B. & Rycroft, D. W. & Tanton, T. W., 1996. "Seasonal movement of salts in naturally structured saline-sodic clay soils," Agricultural Water Management, Elsevier, vol. 32(1), pages 15-27, November.
    3. Barbiero, Laurent & Valles, Vincent & Regeard, Annick & Cheverry, Claude, 2001. "Residual alkalinity as tracer to estimate the changes induced by forage cultivation in a non-saline irrigated sodic soil," Agricultural Water Management, Elsevier, vol. 50(3), pages 229-241, September.
    4. Umali, D.L., 1993. "Irrigation-Induced Salinity; A growing Problem for Development and Environment," Papers 215, World Bank - Technical Papers.
    5. Tanton, T. W. & Rycroft, D. W. & Hashimi, M., 1995. "Leaching of salt from a heavy clay subsoil under simulated rainfall conditions," Agricultural Water Management, Elsevier, vol. 27(3-4), pages 321-329, July.
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    1. Aein, Reza & Alizadeh, Hosein, 2021. "Integrated hydro-economic modeling for optimal design of development scheme of salinity affected irrigated agriculture in Helleh River Basin," Agricultural Water Management, Elsevier, vol. 243(C).

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