Irrigation with saline-sodic water: effects on two clay soils

  • Giovanna Cucci | giovanna.cucci@uniba.it Department of Agricultural and Environmental Science, University of Bari A. Moro, Italy.
  • Giovanni Lacolla Department of Agricultural and Environmental Science, University of Bari A. Moro, Italy.

Abstract

The results of a 4-year experiment aimed at evaluating the effect of irrigation with saline-sodic water on the soil are reported. The research was carried out at the Campus of the Agricultural Faculty of Bari University (Italy) on 2 clay soils (Bologna – T1 and Locorotondo – T2). The soils were cropped to borlotto bean (Phaseolus vulgaris L.), capsicum (Capsicum annuum L.), sunflower (Helianthus annuus L.), wheat (Triticum durum Desf) grown in succession; the crops were irrigated with 9 saline-sodic types of water and subjected to two different leaching fractions (10% and 20% of the watering volume). The 9 solutions were obtained dissolving in de-ionised water weighted amounts of sodium chloride (NaCl) and calcium chloride (CaCl2), deriving from the combination of 3 saline concentrations and 3 sodicity levels. The crops were irrigated whenever the water lost by evapotranspiration from the soil contained in the pots was equal to 30% of the soil maximum available water. The results showed that, though the soils were leached during the watering period, they showed a high salt accumulation. Consequently, the saturated soil extract electrical conductivity increased from initial values of 0.65 and 0.68 dS m-1 to 11.24 and 13.61 dS m-1 at the end of the experiment, for the soils T1 and T2, respectively. The saline concentration increase in irrigation water caused in both soils a progressive increase in exchangeable sodium, and a decrease in exchangeable calcium and non-significant variations in exchangeable potassium (K) and magnesium (Mg).

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Published
2013-05-30
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Original Articles
Keywords:
irrigation, leaching fractions, saline-sodic water, soil.
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How to Cite
Cucci, G., & Lacolla, G. (2013). Irrigation with saline-sodic water: effects on two clay soils. Italian Journal of Agronomy, 8(2), e13. https://doi.org/10.4081/ija.2013.e13