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Does water-saving irrigation improve the quality of fruits and vegetables? Evidence from meta-analysis

  • Michael O. AduEmail author
  • David O. Yawson
  • Ernest E. Abano
  • Paul A. Asare
  • Frederick A. Armah
  • Eugene K. Opoku
Review

Abstract

Water productivity has become a key requirement in sustainable crop production and environmental management. Deficit irrigation (DI) and partial root-zone drying irrigation (PRDI) are two strategies that have been exploited to maximize crop production per unit water, with attendant effect on the quality attributes of harvest index. We employed meta-analysis to synthesize evidence for the relative performance of full irrigation (FI), DI and PRDI for three quality attributes of fruits and vegetables, namely, total soluble solids (TSS), titratable acidity (TA) and pH. Overall, TSS, TA and pH of crops under DI and PRDI do not differ significantly. However, TSS in crops under DI and PRDI are significantly larger than that of crops under FI. DI and PRDI improve TSS by 4.1 ± 1.8% and 5.0 ± 2.0%, respectively, relative to FI. Crops under the three irrigation techniques do not differ significantly in TA and pH. The differences in TSS of crops are contextual, depending on type of crop, soil texture and irrigation frequency. The effect of water-saving irrigation on the selected crop quality attributes may, therefore, have the add-on effects of crop, system and/or site characteristics. Therefore, in terms of quality attributes, water-saving irrigation techniques are superior to FI when considering improvement in TSS without significantly altering TA or pH of fruits and vegetables.

Notes

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

Supplementary material

271_2019_646_MOESM1_ESM.docx (1.7 mb)
Supplementary material 1 (DOCX 1737 kb)

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Authors and Affiliations

  1. 1.Department of Crop Science, School of Agriculture, College of Agriculture and Natural SciencesUniversity of Cape CoastCape CoastGhana
  2. 2.Department of Environmental Science, School of Biological Science, College of Agriculture and Natural SciencesUniversity of Cape CoastCape CoastGhana
  3. 3.Department of Agricultural Engineering, School of Agriculture, College of Agriculture and Natural SciencesUniversity of Cape CoastCape CoastGhana

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