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Effects of Saline and Deficit Irrigation on Soil-Plant Water Status and Potato Crop Yield under the Semiarid Climate of Tunisia

Author

Listed:
  • Hiba Ghazouani

    (Department of Plant Biotechnology, Higher Institute of Biotechnology of Beja, Avenue Habib Bourguiba, B.P: 382, Béja 9000, Tunisia)

  • Giovanni Rallo

    (Department of Agriculture, Food and Environment (DAFE), University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy)

  • Amel Mguidiche

    (Olive Institute, Unit of Sousse, Ibn Khaldoun 14, Sousse 4061, Tunisia)

  • Basma Latrech

    (Department of Rural Engineering, High Agronomic Institute of Chott Mériem, Université de Sousse, BP 47, Chott Mériem Sousse 4042, Tunisia)

  • Boutheina Douh

    (Department of Rural Engineering, High Agronomic Institute of Chott Mériem, Université de Sousse, BP 47, Chott Mériem Sousse 4042, Tunisia)

  • Abdelhamid Boujelben

    (Department of Rural Engineering, High Agronomic Institute of Chott Mériem, Université de Sousse, BP 47, Chott Mériem Sousse 4042, Tunisia)

  • Giuseppe Provenzano

    (Department Agriculture, Food and Forest Sciences, Università degli Studi di Palermo, Viale delle Scienze 12, Ed.4, 90128 Palermo, Italy)

Abstract

Water supplies have been decreasing in several semi-arid regions, and it is therefore necessary to adopt irrigation strategies aimed at maximizing water use efficiency. In this paper, the effects of saline and deficit irrigation on water use efficiency and on potato crop response, based on observations of soil and plant water status, were investigated. Experiments were carried out in Central Tunisia, by monitoring potato crop growth during two seasons in four distinct treatments (T1–T4), represented by two different irrigation doses and two water qualities. For irrigation scheduling purposes, thresholds of soil matric potential, soil water content and Crop Water Stress Index (CWSI) were identified with the aim to quantify the effects of water and/or salinity stress on the achievable yield. Experiments allowed verifying that crop yield is strongly affected by the seasonal amount and quality of applied water. Despite differences of crop yield between treatments T2, T3 and T4 not being statistically significant ( P < 0.05), crop yield varied between 26.3 t/ha (T3 in 2015) to 16.3 t/ha (T4 in 2015). However, crop yield decline of 17.0 t/ha and 12.0 t/ha per each 100 mm decrease of applied water were observed under the application of water electrical conductivity of 1.6 dS/m and 4.1 dS/m respectively. On the other hand, an increase of 1.0 dS/m in water electrical conductivity caused a yield decline rate of about 10%. The results achieved showed that under the semi-arid climate of Tunisia, potato crop irrigation should be scheduled to avoid water deficit; however, the possibility to reduce water supply can be envisaged when water availability is limited, but with the awareness to accept the shortage of production. Finally, when saline water is the only source available to the farm, it is necessary to avoid the reduction of irrigation doses, to prevent excessive salt accumulation in the root zone with unavoidable effects on crop yield.

Suggested Citation

  • Hiba Ghazouani & Giovanni Rallo & Amel Mguidiche & Basma Latrech & Boutheina Douh & Abdelhamid Boujelben & Giuseppe Provenzano, 2019. "Effects of Saline and Deficit Irrigation on Soil-Plant Water Status and Potato Crop Yield under the Semiarid Climate of Tunisia," Sustainability, MDPI, vol. 11(9), pages 1-16, May.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:9:p:2706-:d:230564
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    References listed on IDEAS

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    1. Martínez-Gimeno, M.A. & Bonet, L. & Provenzano, G. & Badal, E. & Intrigliolo, D.S. & Ballester, C., 2018. "Assessment of yield and water productivity of clementine trees under surface and subsurface drip irrigation," Agricultural Water Management, Elsevier, vol. 206(C), pages 209-216.
    2. Autovino, Dario & Rallo, Giovanni & Provenzano, Giuseppe, 2018. "Predicting soil and plant water status dynamic in olive orchards under different irrigation systems with Hydrus-2D: Model performance and scenario analysis," Agricultural Water Management, Elsevier, vol. 203(C), pages 225-235.
    3. Wang, Feng-Xin & Kang, Yaohu & Liu, Shi-Ping & Hou, Xiao-Yan, 2007. "Effects of soil matric potential on potato growth under drip irrigation in the North China Plain," Agricultural Water Management, Elsevier, vol. 88(1-3), pages 34-42, March.
    4. Rallo, Giovanni & González-Altozano, Pablo & Manzano-Juárez, Juan & Provenzano, Giuseppe, 2017. "Using field measurements and FAO-56 model to assess the eco-physiological response of citrus orchards under regulated deficit irrigation," Agricultural Water Management, Elsevier, vol. 180(PA), pages 136-147.
    5. Ierna, Anita & Mauromicale, Giovanni, 2012. "Tuber yield and irrigation water productivity in early potatoes as affected by irrigation regime," Agricultural Water Management, Elsevier, vol. 115(C), pages 276-284.
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    1. Ning Wang & Yingying Xing & Xiukang Wang, 2019. "Exploring Options for Improving Potato Productivity through Reducing Crop Yield Gap in Loess Plateau of China Based on Grey Correlation Analysis," Sustainability, MDPI, vol. 11(20), pages 1-14, October.

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