Abstract
Capillary barriers (CBs) occur at the interface of two soil layers having distinct differences in textural and hydraulic characteristics. The objective of this study was to introduce an artificial CB, created by a layer of gravel below the root zone substrate, in order to optimize conditions for the cultivation of horticultural crops. Potential root zone formats were analyzed with and without the gravel CBs for variables including the following: depth of CB; barrier separating the root zone from the surrounding soil; and root zone soil texture. Field and simulated results revealed that artificial CBs increased root zone water content and changed water flow dynamics. Volumetric soil water content was increased by 20–70%, depending on the soil texture and depth of the barrier. Sandy soil texture and shallower placement resulted in relatively higher water content. For sandy soil without plants, a shallow (0.2 m depth) CB increased water content of the overlaying soil by 50% compared to the control. The introduction of a gravel CB below the root zone of pepper plants (Capsicum Annum L.) lead to 34% higher matric head, 50% lower diurnal fluctuations in matric head and 40% increase in pepper fruit yield. Increasing water content by way of artificial CBs appeared to improve the water use efficiency of pepper plants. Such an improvement could lead to reduced water and fertilizer application rates and subsequent reduction in contamination below the root zone. This is especially relevant for substrates of low water-holding capacity typically used in horticulture crop production.
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Abbreviations
- CB:
-
Capillary barrier
- TDR:
-
Time domain reflectometry
References
Akindunni FF, Gillham RW, Nichollson RV (1991) Numerical simulations to investigate moisture-retention characteristics in the design of oxygen-limiting covers for reactive mine tailings. Can Geotech J 28:446–451
Ben-Gal A, Dudley L (2003) Phosphorus availability under continuous point-source irrigation. Soil Sci Soc Am J 67:1449–1456
Boyer JS (1982) Plant productivity and environment. Science 218:443–448
Bussière B (1999) Étude du comportement hydrique de couverture avec effets de barrières capillaires inclinées à l’aide de modélisations physiques et numériques. PhD Thesis, École Polytechnique de Montréal, Canada, 354 pp
Bussière B, Aubertin M, Chapuis RP (2003) The behavior of inclined covers used as oxygen barriers. Can Geotech J 40:512–535
Carsel RF, Parrish RS (1988) Developing joint probability distributions of soil water retention characteristics. Water Resour Res 24(5):755–769
Dane JH, Topp GC (2002) Methods of soil analysis, part 4; physical methods. Soil science society of America book series, no. 5. Soil Science Society of America, Inc., Madison, 1692 pp (Hardback)
Fala O, Molson J, Aubertin M, Bussiere B (2005) Numerical modeling of flow and capillary barrier effects in unsaturated waste rock piles. Mine Water Environ 24:172–185
Green CT, Puckett LJ, Böhlke JK, Bekins BA, Phillips SP, Kauffman LJ, Denver JM, Johnson HM (2008) Limited occurrence of denitrification in four shallow aquifers in agricultural areas of the United States. J Environ Qual 37(3):994–1009
Hillel D (1998) Environmental soil physics. Academic press, San Diego
Kampf M, Holfelder T, Montenegro H (1998) Inspection and numerical simulations of flow processes in capillary barrier cover systems, In: Holz KP, Bechteler W, Wang SSY, Kawahara M (eds) Advances in hydro-science and engineering, proceedings of the 3rd international conference on hydro-science and -engineering. Brandenburg University, Cottbus
Lazarovitch N, Šimůnek J, Shani U (2005) System-dependent boundary condition for water flow from subsurface source. Soil Sci Soc Am J 69:46–50
Leib BG, Caspari HW, Redulla CA, Andrews PK, Jabro JJ (2006) Partial rootzone drying and deficit irrigation of ‘Fuji’ apples in a semi-arid climate. Irrig Sci 24:85–99
Mallants D, Volckaert G, Marivoet J (1999) Sensitivity of protective barrier performance to changes in rainfall rate. Waste Manag 19:467–475
Mbonimpa M, Aubertin M, Aachib M, Bussiere B (2003) Diffusion and consumption of oxygen in unsaturated cover materials. Can Geotech J 40:916–932
Morris CE, Stormont JC (1998) Evaluation of numerical simulations of capillary barrier field tests. Geotech Geolog Eng 16:201–213
Mualem Y (1976) A new model for predicting the hydraulic conductivity of unsaturated porous media. Water Resour Res 12:513–522
Nicholson RV, Gillham RW, Barbour SL (1989) Reduction of acid generation in mine tailings through the use of moisture-retaining layers as oxygen barriers. Can Geotech J 26:1–8
Nimah MN, Hanks RJ (1973) Model for estimating soil water, plant and atmospheric interrelationships: I. Description and sensitivity. Soil Sci Soc Am Proc 37:522–527
Reynolds WD, Elrick DE (2002) Falling head soil core (tank) method. In: Dane JH et al (eds) Methods of soil analysis. Part 4. SSSA book ser. 5. SSSA, Madison, pp 809–812
Robinson D (1996) Variation, co-ordination and compensation in root systems in relations to soil variability. Plant Soil 187(1):57–66
Rooney DJ, Brown KW, Thomas JC (1998) The effectiveness of capillary barriers to hydraulically isolate salt contaminated soils. Water Air Soil Pollut 104:1573–2932
Russo D, Zaidel J, Laufer A (2007) Numerical analysis of solute transport from trickle sources in a combined desert soil—imported soil flow system. Vadose Zone J 7:53–66
Segal E, Ben-Gal A, Shani U (2006) Root water uptake efficiency under ultra-high irrigation frequency. Plant Soil 282:333–341
Šimůnek J, van Genuchten MT, Šejna M (2006) The HYDRUS software package for simulating two and three-dimensional movement of water, heat, and multiple solutes in variably-saturated media. Technical manual, version 1.0. PC Progress, Prague, p 241
Šimůnek J, van Genuchten MT, Šejna M (2008) Development and applications of the HYDRUS and STANMOD software packages, and related codes. Vadose Zone J 7(2):587–600
Skaggs TH, Trout TJ, Imnek J, Shouse PJ (2004) Comparison of HYDRUS-2D simulations of drip irrigation with experimental observations. J Irrig Drain Eng 130:304–310
Stikic R, Popovic S, Srdic M, Savic D, Jovanovic Z, Prokic L, Zdravkovic J (2003) Partial root drying (PRD): a new technique for growing plants that saves water and improves the quality of fruit. Bulg J Plant Phys, special issue:164–171
Stormont JC, Anderson CE (1999) Capillary barrier effect from underlying coarser soil layer. J Geotechol Geoenviron Eng 125(8):641–648
Stormont JC, Morris CE (1997) Unsaturated drainage layers for the diversion of infiltrating water. J Irr Drain Eng 123:364–366
van Genuchten MT (1980) A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci Soc Am J 44:892–898
van Genuchten MT, Leij FJ, Yates SR (1991) The RETC code for quantifying the hydraulic functions of unsaturated soils. U.S. Salinity Laboratory U.S. Department of Agriculture, Agricultural Research Service, Riverside
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Ityel, E., Lazarovitch, N., Silberbush, M. et al. An artificial capillary barrier to improve root zone conditions for horticultural crops: physical effects on water content. Irrig Sci 29, 171–180 (2011). https://doi.org/10.1007/s00271-010-0227-3
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DOI: https://doi.org/10.1007/s00271-010-0227-3