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Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta

Arid Land Research Center, Tottori University, Tottori 680-0001, Japan
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Academic Editor: Francesco Fiorillo
Water 2021, 13(7), 993; https://doi.org/10.3390/w13070993
Received: 5 March 2021 / Revised: 1 April 2021 / Accepted: 2 April 2021 / Published: 4 April 2021
Salinity is a major threat to the sustainability of irrigated agriculture in arid and semi-arid regions. Leaching is the primary measure for removing excess salts from the root zone, but not all water applied to the soil surface contributes to the removal of salts. In clayey soils, bypass flow along cracks can occur without being mixed with saline pore water in the matrix. To present a field dataset to quantitatively evaluate the contribution of bypass flow to the leaching of salts, soil sampling and monitoring of groundwater and discharge from a tile drain were carried out in farmland having a cracking soil in the Nile Delta. The electrical conductivities of 1:2 extracts were measured to evaluate the salinity of the soil. The first evidence for the occurrence of significant bypass flow through cracks was the salinity of the pore water, which was nearly triple that of the shallow groundwater and outflow from drainage. Second, the difference in root zone salinity before and after paddy rice cultivation was not significant. Third, the gradient of the groundwater table was very small. in spite of the low saturated hydraulic conductivity. Fourth, the salinity of the outflow from the tile drain dropped just after irrigation or rain. These results indicated that bypass flow through cracks played a significant role in the drainage process in the soil, and that nearly half of the water bypasses through cracks in the field with a cracking soil. View Full-Text
Keywords: salinity stress; solute transport; preferential flow; drainage salinity stress; solute transport; preferential flow; drainage
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MDPI and ACS Style

Fujimaki, H.; Abd El Baki, H.M.F. Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta. Water 2021, 13, 993. https://doi.org/10.3390/w13070993

AMA Style

Fujimaki H, Abd El Baki HMF. Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta. Water. 2021; 13(7):993. https://doi.org/10.3390/w13070993

Chicago/Turabian Style

Fujimaki, Haruyuki; Abd El Baki, Hassan M.F. 2021. "Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta" Water 13, no. 7: 993. https://doi.org/10.3390/w13070993

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