Water-saving and high-yielding irrigation for lowland rice by controlling limiting values of soil water potential

Jianchang Yang*, Kai Liu, Zhiqin Wang, Yong Du, Jianhua ZHANG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Citations (Scopus)

Abstract

The present study investigated whether an irrigation system could be established to save water and increase grain yield to enhance water productivity by proper water management at the field level in irrigated lowland rice (Oryza sativa L.). Using two field-grown rice cultivars, two irrigation systems; conventional irrigation and water-saving irrigation, were conducted. In the water-saving irrigation system, limiting values of soil water potential related to specific growth stages were proposed as irrigation indices. Compared with conventional irrigation where drainage was in mid-season and flooded at other times, the water-saving irrigation increased grain yield by 7.4% to 11.3%, reduced irrigation water by 24.5% to 29.2%, and increased water productivity (grain yield per cubic meter of irrigation water) by 43.1% to 50.3%. The water-saving irrigation significantly increased harvest index, improved milling and appearance qualities, elevated zeatin + zeatin riboside concentrations in root bleedings and enhanced activities of sucrose synthase, adenosine diphosphate glucose pyrophosphorylase, starch synthase and starch branching enzyme in grains. Our results indicate that water-saving irrigation by controlling limiting values of soil water potential related to specific growth stages can enhance physiological activities of roots and grains, reduce water input, and increase grain yield.

Original languageEnglish
Pages (from-to)1445-1454
Number of pages10
JournalJournal of Integrative Plant Biology
Volume49
Issue number10
DOIs
Publication statusPublished - Oct 2007

Scopus Subject Areas

  • Biochemistry
  • Biochemistry, Genetics and Molecular Biology(all)
  • Plant Science

User-Defined Keywords

  • Cytokinin
  • Rice
  • Soil water potential
  • Starch synthase
  • Water productivity
  • Water-saving irrigation

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